The infrared light is simply due to a pile-up effect in the detector, so there is no infrared light coming from the laser. It occurres when two photons are counted within a single detector frame. It is particularly noticeable at higher intensities of light.
Thanks for the input. I think you are right. Another commenter mentioned that the 2nd order diffraction of the 522 nm will overlap the 1st order diffraction of 1044 nm. The spectrometer reads it as 1st order infrared... I even mention something similar in my previous but didn't think of it. Still needs a little further investigation since I do not remember seeing any false reading of 2nd order when testing the 1.5W 446 nm Arctic. Would think this would be bright enough to do the same. But maybe I was not pointing the spectrometer's sensor directly at the Arctic's dot. At a lower brightness reading, the 2nd order will be too weak to be picked up by the spectrometer.
@@brainiac75 That's correct; internal diffraction grating within spectrometer is producing 2nd order diffraction of the input beam, thus the internally 2nd order diffracted beam falls in the same position on the CCD as would a 1st order 1044. It's not necessarily brightness that does it as you're coupling through a fibre, it's more likely due to how the intense light actually illuminates the internal grating; presumeably there is a slit within the diffractometer which should help with that.
@@brainiac75 It most likely have to do with the cross section area of the beam as well - since the light intensity hitting the sensor, is not just dependent on output power. Some pointers have wider beam than others and thus have a less concentrated beam (but the good thing is that such a beam has less divergence and can also be focused enough to burn stuff, further away with the same output power, haha). You could try to focus both lasers to a small dot before measuring them - and see if the problem increases. It should do, if it's intensity related. Just be careful to not damage the sensor (since light intensity will be extremely high in that focused dot)
I was going to say it was a reflection of the initial light wave. Similar in its creation as a guitar string is used for sound, all of the 1/2s are included, just not always noticed.
I think I've said it before, but the safety notice in the beginning of each video is such a great addition. Too many youtubers just carelessly do dangerous """Experiments""" without any warning to their, often, young audience. Props!
@@brainiac75 ⚠ *Brightnes per watt does not make a laser more safe!* The human retina itself is red and hence gets damaged much more easily by non-red lasers because of the produces heat. Point a red and other colour lasers at a red balloon and test how much power it takes for the balloon to pop. Only a laser that can not pop balloons (not even black ones) can be considered safe for household use (including foreseeable misuse as child/cat toy). Please add this to your safety guidelines. That's why all those cat igniters (cheap illegal laser pointers) in fancy colours are so problematic. The horrible invisible IR of cheap green pointers that makes people stare into them at cold (where the visible light disappears) is only one part of the problem. That blue lasers nowadays are sold overstrong to visually look as bright as green ones is definitely irresponsible. (Do you smell all those cats set ablaze...) Please analyze now those Chinese tiny starfield projectors (size of a laser pointer but with USB cable) sold for 5$ at eBay. They have a grate with static starfield beam and exist in green (likely with IR) or purple colour with optional screw-on lenses to change the pattern. They are even described as "lamps", not lasers - possibly to avoid regulations. I suspect both to be fairly dangerous to use.
i love to work on lights, & laser is the most amazing science art of light, it can burn, engrave, melt, cut, & it obtains energy, i always wonder what will be possibilities of making the sun as a laser diode.
Something that I have been wondering about is how safe are green laser levels are, I would like to know how powerful they are and if there is any IR leakage. Love your content! Keep up the good work!
Wow, so lumens, lux and cd/m2 are all a measure of how bright something appears to the human eye, and not an absolute measure of luminous (electromagnetic when outside the visible spectrum) energy?! I admit I didn't realise that at all. Well, that's why I subscribe to channels such as yours - one learns something everyday. :)
The IR signal is likely an 'artefact' from the spectrometer. If I detect a signal at 1000nm, all I know is that there is light at either (1000nm, 500nm, 333,nm, 250nm, etc...). Measure the spectrum with and without the IR filter. If the 1044nm peak persists, it's 522nm diffracted to 2nd order. I've worked with many 532nm DPSS lasers of high quality ($10k+) and they all operate on the same principle. An 808nm laser diode pumps an ND:YAG crystal. This generates the 1064nm beam, which is frequency doubled with a crystal to emit 532nm. Typically, 532.3nm. Your laser appears to be of a different construction.
Hm, you may be right. I'm still new to using a spectrometer. I just don't remember seeing a peak around 892 nm when I measured the 1.5W Arctic 446 nm blue laser in an earlier video. Wouldn't that happen if the spectrometer has a 2nd order overlap from very bright sources? But a 2nd order overlap sure makes more sense than half-harmonic generation somewhere in the setup. The shown laser uses a direct-diode laser (diode: Nichia NUGM03) - not a DPSS type. Thanks for watching and maybe explaining the odd peak. Needs further testing :)
Hm, you may be right. I'm still new to using a spectrometer. I just don't remember seeing a peak around 892 nm when I measured the 1.5W Arctic 446 nm blue laser in an earlier video. Wouldn't that happen if the spectrometer has a 2nd order overlap from very bright sources? But a 2nd order overlap sure makes more sense than half-harmonic generation somewhere in the setup. The shown laser uses a direct-diode laser (diode: Nichia NUGM03) - not a DPSS type. Thanks for watching and maybe explaining the odd peak. Needs further testing :)
@@brainiac75 A 446nm laser will absolutely show a 2nd peak at 892nm on a spectrometer. The diffraction efficiency into 2nd order is much much lower than 1st order, which is why the peak is so much lower. But if you measure again and crop out the spectrum to only see 880-900nm, you'll find the 2nd order diffraction of the 446nm peak.
@@brainiac75 If you have fluorescent tubes somewhere, measure that spectrum. You should see a mercury emission peak at 365.0nm as well as 435.8nm. See if you can find the 2nd order lines, 730nm and 871.6nm. Notice how much weaker they are.
Thanks to the equations I could calculate the Lumens and Lux from the 180W green laser I use at work, comes out 108543 Lumens and 245 Giga Lux :) or about 2.23 million times the lux level of the sun at noon on a clear day. Think I will keep my safety glasses on
I have no idea about the second IR peak, but I would try a different surface to target it at. It may be not all reflected light is returning as the same wavelength. No idea if you already know, but when an atom absorbs a photon, the electron jumps to a higher orbit and then falls back down releasing a new photon with the same energy. If the photon energy is high enough it will jump up several levels, the electron can then make two (or more) smaller jumps back to its ground state, reflecting longer wavelength photons. Green probably isn't a high enough energy photon, but I suppose it ultimately depends on what the target surface is made out of.
Thanks for the input! Fluorescence can not be ruled out, but I've received a tip, that it may be a 'false' reading. It may be the 2nd order of diffraction of the 522 nm light. Makes perfect sense the more I think about it. Needs further testing though since I didn't spot any 2nd order from the very bright 446 nm 1.5W Arctic laser in a previous video.
Common 532nm(±10nm)laser pointers are DPSS laser pumps from 808nm infrared laser(808→1064 and then frequency doubled to 532, the original 808nm is usually from laser diode, but theorically can by any laser source), thus there are always be some original 808nm leaked. But if this stuff uses native green laser diode(520~525nm), no infrared would be possible to leak.
what is the camera used at 10:37 thank you for your videos, i was wondering in the past what color was the most visible for night fishing. as i wished to paint some fishing float and equipment not to lose them. you answered many questions!
That's shot on my newest main camera, a Sony FDR-AX700. It has three build-in ND filters. Very useful for filming lasers :) Glad you like my videos. The shown luminosity function is for our photopic vision. That's our color vision under well-lit conditions. Our night vision under very low light - where we can't see colors - is called scotopic vision. Our scotopic vision is most sensitive to a bluish-green 507 nm light. Not a big difference but worth considering ;)
@@brainiac75 thank you very much for the information! i noticed in Christmas time that blue lights are the brightest looking and even some i can see 3-4km away across the lake where i live.
I read somewhere that our eyes evolved a sensitivity to green wavelengths because early humans lived in a green environment (trees, plants, anything with chlorophyll) and hunters had to distinguish prey and predators through trees and grasses. I didn't do more research on the topic, but it sounds about right. Aren't we lucky to live in amazing times where all this cool gear and gadgetry is available to us?!
That could happen if the laser heated it to almost glowing hot. But I expect it would be a broader band in the infrared - not a tight peak. I think another commenter solved the mystery: 2nd order diffraction of 522 nm light is in the same place as 1st order diffraction of 1044 nm. So the spectrometer thinks it sees infrared, while it's just an extra, internal diffraction of the very bright green light. No infrared there. Thanks for watching!
Depending on the inner construction of your spectrometer, the IR peaks could be the higher order reflections of green off e.g. a grating used by the instrument to measure wavelength.
Yep, this seems to be the explanation based on the feedback in the comments. Makes sense, since 2nd order 522 nm diffraction will overlap 1st order 1044 nm diffraction. Completely overlooked this, even though I mentioned something similar in the previous video x) Ah well, I'm new to using spectrometers. I will get better at the art based on your feedback - thanks!
@@brainiac75 Glad that you've figured it out! We've got several different optical spectrum analyzers in our lab, and all of them seem to do that, even the huge high-resolution HP/Agilent beasts. This is just inherent to their construction. I guess if you intend to measure emission from a system where you suspect harmonics, you need to do it separately for each region, using appropriate filters to block the other part of the spectrum (just like you do with safety glasses and IR card in your videos).
Glad you like it. The 500 mW bluray laser is a generic laser sold on eBay. Search for something like '405nm 500mW laser module' and get one that comes with the control board and AC adapter (close up and power test of it in this video: ruclips.net/video/c4RsQdyjgJE/видео.html ). I bought it from a seller called xspar but I think they are all the same...
Years ago, in high school, I always wondered why green light was so crisp (red light was also easy to see) while blue light was so damn blurry. A physicist friend of mine later in college ended up actually looking into it. Turns out there was some science behind that, and not that my eyes were defective (which I assumed was the case) :)
Blue is the most dazzling colour because it is scattered most (beam bounces around) inside the eyeball. That's why bluish LED car and bicycle headlights are much more dangerous tonight than traditional halogen.
7:34 first of all,"It's over 9,000"... Very beautiful very beautifully done. Second I have a question; I understand that our eyes are more sensitive to green light. I work with and sell pipe lasers that are green for this very reason. But that's our eyes... The lux meter... Why is it showing a drastic increase in brightness? That I don't understand. I mean I don't really know how a lux meter works exactly. I know what it's for, But is it supposed to like mimic the human eye or something?
The more powerful in milliwatts, the more damaging. Regardless of wavelength. That's why lux and lumens tells you next to nothing about how safe a laser is to use. But the output in mW does. Thanks for watching!
Nope. The human retina itself is red and hence gets damaged much more easily by non-red lasers because of the produced heat. Point a red and other colour lasers at a red balloon and test how much power it takes for the balloon to pop. Only a laser that can not pop balloons (not even black ones) can be considered safe for household use (including foreseeable misuse as child/cat toy). Please add this to your safety guidelines. ⚠ *Brightnes per watt does not make a laser more safe!*
@@AerialTheShamen hmm interesting, tell me more... i am asking for reasons I want to build bunch of lasers (i need help with laser hosts..) And i want all of them to be 5mw or whatever eye safe is, i essentially want multicolored toys... Probably i'll just go with arround 5mw and call it a day
There was an eye damage warning campaign on tv news when green laser pointers became popular, with an eye doctor demonstrating the red balloon experiment. This New York Times article mentions that green is absorbed stronger by the retina and so produces more heat: www.nytimes.com/2011/03/01/health/01laser.html Here is a brief note that wavelength matters with retina damage: www.sciencedaily.com/releases/2018/01/180126130442.htm
Nope. Luckily the beam is moving very fast when the show laser is projecting an image on a nonspecular wall - making the reflected light eye- and camera safe (though I may be pushing it with such a small projection at a short distance). Notice how I avoid filming the steady dot when making the power measurement. The camera would not be happy about a 6 seconds steady spot from a 1 watt laser... Thanks for watching!
6:38 maybe the heat of the material emit the Infrared, because y'know lazer heat stuff and stuff emit infrared when gets hot, idk im not a scientist just a wild guess xD
Thanks for the input. Needs further investigation - I'm new to using spectrometers. But another commenter may have solved it: It could very well be 2nd order 522 nm diffraction. That is in the same place as 1st order 1044 nm diffraction. Usually, 2nd order diffraction is not visible on the spectrometer, but this laser is so bright that 2nd order of the green could be detected by the sensor. Thanks for watching!
wow, its power level is over 9,000, neat i wonder if you fiddled with the position of the sensor and reflective surface to get it to line up the reading of over 9000
Actually there is. If you search “Equal-loudness contour” in Wikipedia, you will see a set of curves that all have a minimum around 3 to 4 kHz, which means our ears are the most sensitive around those frequencies. The actual frequency depends on the intensity of the sound and other factors like age or just differences between persons. My guess as to why it are those frequencies, is because they are important to understand speech. I only hear up to about 2kHz with one ear, and understanding people with only that ear is extremely difficult.
Smoke alarms beep at the most sensitive frequencies. That's why they torment so much despite the small battery. Ar bass range you would need 100W to feel as loud.
It is likely your reading equipment is reading an overtone that doesn't exist. Our ears do the same with sound. Two tubas playing the same note very cleanly will clearly create multiple overtones in what is heard. Those higher notes are not actually being played, however our eardrums still perceive extra octaves. Same process as electrical vibration.
I guess those must be the more advanced kind of idiots then, who are just smart enough to figure out that green lasers are the brightest, but still too dumb to understand the consequences of their actions…
random observation, but are the safety laser goggles similar to being colour blind? I have a pair and it blocks or limits certain colours. (190-540&800-1700nm OD5+) 4:43 ~400nm area --->- is some weird colour. cant see the blue and the green overlaps with blue. yellow is basicly organge and red is more orange ~700nm -
I know next to nothing about color blindness, but makes sense if the glasses blocks the colors that color blinds can't see (or tell from another color). Thanks for watching!
Kinda? The human eye can detect only 3 bands of colour: red, green and blue, which is why we use RGB for displays and projection. However, for printers and paint we use Cyan, Magenta and Yellow (CMY), because when you mix physical pigments together (like paint) the result is darker than the original, so instead of adding to black to get our colour (like RGB light), we subtract CMY from white (our white paper background) to get our colour.
That infrared might be heat coming from the computer or the laser. Maybe the heat from the diode will come from the inside of the diode same way as the green light does, as a laser light...
Thanks for the input. Needs further testing, since I'm new to using a spectrometer. Someone mentioned it may be the 2nd order of 522 nm coming from the diffraction grating inside the spectrometer. So a 'false' reading where the 2nd order of 522 nm is picked up as was it 1st order 1044 nm infrared. Sounds very plausible to me. Thanks for watching!
@@brainiac75 you can measure the output through the infrared filters. Interestingly, this wavelenght wasn't on the lasers you measured previously... hard to say
I got tired of red back in the early days where a weak, red laser was all I had for years... But today I do enjoy a powerful red laser beam. Thanks for watching!
@@brainiac75 I made my first red one in 1990th from a scrapped CD player. I even tried hard to add a current regulation circuit from a magazine to protect the diode (likely a resistor would not be worse), but the thing was so dim that it was barely visible (and grew dimmer when heated up), But it was stil exiting to see the grainy red light and how it formed stripe patterns when shining through fine cloth and such simple things.
Could it be possible that the laser is heating up the surface it's hitting, and causing the surface to release infrared light due to heat? I have no idea why it would be exactly double the wavelength, but it's not too much of a stretch to suppose that it'd be related.
Thanks for the input. I would expect heating to be a more broad band in the infrared. Could be interesting to test it with a laser burning some wood etc. Another commenter may have found the solution: 2nd order diffraction of 522 nm light is in the same place as 1st order diffraction of 1044 nm light. With a very bright light source, the spectrometer may pick up the 2nd order diffraction - a false reading in infrared.
Thanks for the input. I would expect ambient infrared to be a wider band - not a peak, but it needs further testing. Someone suggested it may be 2nd order diffraction of the 522 nm light inside the spectrometer. 2nd order 522 nm is in the same place as 1st order 1044 nm infrared, so seems very plausible. No infrared - just a 'false' reading on the very, very bright 522 nm light.
Sorry, it is an experimental laser. I don't think they will market it. It is too specialized over any other RGB show laser. The brightness is absolutely fantastic, but the lack of all other colors is a bigger downside. Thanks for watching!
Sir, you hit upon a very good point, but please allow me to reconfirm with you that the info you have been given is independently corroborated: Can yo tear it apart to Mae sure it is NOT in actuality an infra-red diode with a "green filter so to speak" over it. This is not an uncommon practice. The infrared peak is coming from the laser and the green light may be obscuring detection otherwise. I should want to get in there and personally examine that diode. Thank you very kindly. Thor
Thanks for the input. It needs further investigation, since I am new to using spectrometers, but another commenter pointed out it may simply be 2nd order diffraction of the very bright 522 nm. 2nd order 522 nm is at the same angle as 1st order 1044 nm - fooling the spectrometer into believing it is infrared. Sounds very plausible to me. I have found no info on infrared coming from the Nichia NUGM03 diode used in the laser.
I used to do this really REALLY stupid thing as a kid, I took a red laser pointer, and just looked directly in to it while it was on, because it looked like pretty, now my eyesight has definitely degraded but somehow not to the point I need glasses.
I remember when I was a teenager and got my first red key chain laser. They were rare back then, so I showed it to a kid in my family. He desperately wanted to try it, so I gave it to him repeating out loud: Don't point it into anyone's eye! The first thing he did was to point it into his own eye... Luckily the laser was only ~1 mW and the blink reflex kicked in saving his eyes from any damage. But it shows you were not the only one and laser's are not kids toys :) Thanks for watching with your remaining eye ;)
One thing i dont understand, yes our eyes perceive green light to be way more brighter then blue light, but a lux meter ? wouldn't it measure the same ?. For example two 200mW lasers (532nm and 650nm ) tested both have the same power, to our eyes the green one will be much more brighter than the red one, but to a luxmeter wouldnt it be the same " brightness" ?.
about lasers..... It may be (it IS by the way) dangerous but what could happen when, in a safe location, you combine all of your lasers with an optic? or into a single point? what if this beam meets a magnet?
Fun fact:You can see TV remote controls flash of Infrared radiation using your devices camera try it out (because your devices camera can see a bit more than the visible spectrum) Also because TV remote controls use Infrared radiation so that's how TV's know what button your pressing. Try it and you'll believe me. If I have a wrong grammar don't blame me English is not our primary language but secondary.
Brightest isn't necessarily the best... DPSS lasers will outperform single emitter diode lasers in beam quality and specs as well. When expanded a decent quality DPSS laser produces a nice round beam. But this depends if the pump diode is a single mode or a multi mode, a multi-mode and uncorrected pump diode will translate into a more oval output beam. One thing is for sure green DPSS is the best laser to work on and how to learn alignment and a bunch of other nifty things for a hobbiest. 🤟🧐
![Blox Fruits Dragon Rework Update [Full Stream]](http://i.ytimg.com/vi/EqDAp8udhm0/mqdefault.jpg)
Green lasers are great - glad we are on the same wavelength.
522 nm! 😎
=;o)
That joke made me turn red.
Pin this man
Because it gives you willpower...
Of a Green Lantern!
Just casually saying "It's over 9000"
I love it.
The slight pause cemented it in
Wasn't expecting "It's over 9000" in here...
The infrared light is simply due to a pile-up effect in the detector, so there is no infrared light coming from the laser. It occurres when two photons are counted within a single detector frame. It is particularly noticeable at higher intensities of light.
Thanks for the input. I think you are right. Another commenter mentioned that the 2nd order diffraction of the 522 nm will overlap the 1st order diffraction of 1044 nm. The spectrometer reads it as 1st order infrared...
I even mention something similar in my previous but didn't think of it. Still needs a little further investigation since I do not remember seeing any false reading of 2nd order when testing the 1.5W 446 nm Arctic. Would think this would be bright enough to do the same. But maybe I was not pointing the spectrometer's sensor directly at the Arctic's dot. At a lower brightness reading, the 2nd order will be too weak to be picked up by the spectrometer.
@@brainiac75 That's correct; internal diffraction grating within spectrometer is producing 2nd order diffraction of the input beam, thus the internally 2nd order diffracted beam falls in the same position on the CCD as would a 1st order 1044. It's not necessarily brightness that does it as you're coupling through a fibre, it's more likely due to how the intense light actually illuminates the internal grating; presumeably there is a slit within the diffractometer which should help with that.
@@AlexA-hm6kj big brain
@@brainiac75 It most likely have to do with the cross section area of the beam as well - since the light intensity hitting the sensor, is not just dependent on output power. Some pointers have wider beam than others and thus have a less concentrated beam (but the good thing is that such a beam has less divergence and can also be focused enough to burn stuff, further away with the same output power, haha).
You could try to focus both lasers to a small dot before measuring them - and see if the problem increases. It should do, if it's intensity related. Just be careful to not damage the sensor (since light intensity will be extremely high in that focused dot)
I was going to say it was a reflection of the initial light wave. Similar in its creation as a guitar string is used for sound, all of the 1/2s are included, just not always noticed.
It's over 9000!
I regret nothing.
I was too late to do it myself XD
Parody video: "Brainiac75 & the Venom Cube are OVER 9000!" ruclips.net/video/IzE4pGEq59A/видео.html
@@yin-fire3263 yep me too
I think I've said it before, but the safety notice in the beginning of each video is such a great addition.
Too many youtubers just carelessly do dangerous """Experiments""" without any warning to their, often, young audience.
Props!
Glad you like it! I would hate to be the guy that gets someone unknowingly hurt from a video. And why not put my channel's logo into good use ;)
@@brainiac75 ⚠ *Brightnes per watt does not make a laser more safe!*
The human retina itself is red and hence gets damaged much more easily by non-red lasers because of the produces heat. Point a red and other colour lasers at a red balloon and test how much power it takes for the balloon to pop. Only a laser that can not pop balloons (not even black ones) can be considered safe for household use (including foreseeable misuse as child/cat toy). Please add this to your safety guidelines.
That's why all those cat igniters (cheap illegal laser pointers) in fancy colours are so problematic. The horrible invisible IR of cheap green pointers that makes people stare into them at cold (where the visible light disappears) is only one part of the problem. That blue lasers nowadays are sold overstrong to visually look as bright as green ones is definitely irresponsible.
(Do you smell all those cats set ablaze...)
Please analyze now those Chinese tiny starfield projectors (size of a laser pointer but with USB cable) sold for 5$ at eBay. They have a grate with static starfield beam and exist in green (likely with IR) or purple colour with optional screw-on lenses to change the pattern. They are even described as "lamps", not lasers - possibly to avoid regulations. I suspect both to be fairly dangerous to use.
_Brainiac75: "I'm too sexy for Vest, too sexy for my vest, so sexy my eyes hurrrrrrrt"_
xD
Haha, I'm actually almost as bald as Richard Fairbrass. Now that song is stuck in my head for the rest of the day... thanks.... x)
Thanks for shedding some highly concentrated light on this issue
I see what you did
i love to work on lights, & laser is the most amazing science art of light, it can burn, engrave, melt, cut, & it obtains energy, i always wonder what will be possibilities of making the sun as a laser diode.
*🎵the sun is a deadly lazer🎵*
Braniac: what does the lux meter say?
Lux meter: IT'S OVER 9000!!!!
i love your accent, its so soothing and dreamy.
Something that I have been wondering about is how safe are green laser levels are, I would like to know how powerful they are and if there is any IR leakage.
Love your content! Keep up the good work!
Wow, so lumens, lux and cd/m2 are all a measure of how bright something appears to the human eye, and not an absolute measure of luminous (electromagnetic when outside the visible spectrum) energy?! I admit I didn't realise that at all. Well, that's why I subscribe to channels such as yours - one learns something everyday. :)
I also didn't realise this. It almost seems unscientific... 🧐
@@iamdave84 Exactly!
The IR signal is likely an 'artefact' from the spectrometer. If I detect a signal at 1000nm, all I know is that there is light at either (1000nm, 500nm, 333,nm, 250nm, etc...).
Measure the spectrum with and without the IR filter. If the 1044nm peak persists, it's 522nm diffracted to 2nd order.
I've worked with many 532nm DPSS lasers of high quality ($10k+) and they all operate on the same principle. An 808nm laser diode pumps an ND:YAG crystal. This generates the 1064nm beam, which is frequency doubled with a crystal to emit 532nm. Typically, 532.3nm. Your laser appears to be of a different construction.
I was about to suggest the same about the peak being a second order diffraction coming from the spectrometer itself.
Hm, you may be right. I'm still new to using a spectrometer. I just don't remember seeing a peak around 892 nm when I measured the 1.5W Arctic 446 nm blue laser in an earlier video. Wouldn't that happen if the spectrometer has a 2nd order overlap from very bright sources? But a 2nd order overlap sure makes more sense than half-harmonic generation somewhere in the setup.
The shown laser uses a direct-diode laser (diode: Nichia NUGM03) - not a DPSS type. Thanks for watching and maybe explaining the odd peak. Needs further testing :)
Hm, you may be right. I'm still new to using a spectrometer. I just don't remember seeing a peak around 892 nm when I measured the 1.5W Arctic 446 nm blue laser in an earlier video. Wouldn't that happen if the spectrometer has a 2nd order overlap from very bright sources? But a 2nd order overlap sure makes more sense than half-harmonic generation somewhere in the setup.
The shown laser uses a direct-diode laser (diode: Nichia NUGM03) - not a DPSS type. Thanks for watching and maybe explaining the odd peak. Needs further testing :)
@@brainiac75
A 446nm laser will absolutely show a 2nd peak at 892nm on a spectrometer. The diffraction efficiency into 2nd order is much much lower than 1st order, which is why the peak is so much lower. But if you measure again and crop out the spectrum to only see 880-900nm, you'll find the 2nd order diffraction of the 446nm peak.
@@brainiac75
If you have fluorescent tubes somewhere, measure that spectrum. You should see a mercury emission peak at 365.0nm as well as 435.8nm. See if you can find the 2nd order lines, 730nm and 871.6nm. Notice how much weaker they are.
IT'S OVER 9000
6:58 Wait, so the VenumCube's laser isn't a DPSS laser? What kind of laser is it?
your videos are always great!
it over 9000
vegeta your scouter must be malfunctioning
Thanks to the equations I could calculate the Lumens and Lux from the 180W green laser I use at work, comes out 108543 Lumens and 245 Giga Lux :) or about 2.23 million times the lux level of the sun at noon on a clear day. Think I will keep my safety glasses on
Informative and cool video as always, loved the nod to the over 9k meme, it was pleasant surprise. 😂
Stay safe and have a great day!
Thanks, the meme is getting old but seemed fitting here ;)
I have no idea about the second IR peak, but I would try a different surface to target it at. It may be not all reflected light is returning as the same wavelength.
No idea if you already know, but when an atom absorbs a photon, the electron jumps to a higher orbit and then falls back down releasing a new photon with the same energy.
If the photon energy is high enough it will jump up several levels, the electron can then make two (or more) smaller jumps back to its ground state, reflecting longer wavelength photons.
Green probably isn't a high enough energy photon, but I suppose it ultimately depends on what the target surface is made out of.
Thanks for the input! Fluorescence can not be ruled out, but I've received a tip, that it may be a 'false' reading. It may be the 2nd order of diffraction of the 522 nm light. Makes perfect sense the more I think about it. Needs further testing though since I didn't spot any 2nd order from the very bright 446 nm 1.5W Arctic laser in a previous video.
Common 532nm(±10nm)laser pointers are DPSS laser pumps from 808nm infrared laser(808→1064 and then frequency doubled to 532, the original 808nm is usually from laser diode, but theorically can by any laser source), thus there are always be some original 808nm leaked.
But if this stuff uses native green laser diode(520~525nm), no infrared would be possible to leak.
3:31 IT'S OVER 9000
Very educational, great job as always!
The two watt white at the end of the video 10:25 started looking more violet as you dimmed the exposure.
what is the camera used at 10:37
thank you for your videos, i was wondering in the past what color was the most visible for night fishing. as i wished to paint some fishing float and equipment not to lose them. you answered many questions!
That's shot on my newest main camera, a Sony FDR-AX700. It has three build-in ND filters. Very useful for filming lasers :)
Glad you like my videos. The shown luminosity function is for our photopic vision. That's our color vision under well-lit conditions. Our night vision under very low light - where we can't see colors - is called scotopic vision. Our scotopic vision is most sensitive to a bluish-green 507 nm light. Not a big difference but worth considering ;)
@@brainiac75 thank you very much for the information! i noticed in Christmas time that blue lights are the brightest looking and even some i can see 3-4km away across the lake where i live.
Could you do a video regarding the properties of a crystal ball and how it bends reflects and refracts light. Thank you.
Maybe. Optics can be very interesting. I have some clips in an old video of mine with a crystal ball: The Beauty of The Sphere. Thanks for watching!
I was laughing so hard when you said
“ it was over 9000!!!”
I read somewhere that our eyes evolved a sensitivity to green wavelengths because early humans lived in a green environment (trees, plants, anything with chlorophyll) and hunters had to distinguish prey and predators through trees and grasses. I didn't do more research on the topic, but it sounds about right.
Aren't we lucky to live in amazing times where all this cool gear and gadgetry is available to us?!
I suspect the material you had the Lasor shooting at was getting excited and emitting infrared?
That could happen if the laser heated it to almost glowing hot. But I expect it would be a broader band in the infrared - not a tight peak. I think another commenter solved the mystery: 2nd order diffraction of 522 nm light is in the same place as 1st order diffraction of 1044 nm. So the spectrometer thinks it sees infrared, while it's just an extra, internal diffraction of the very bright green light. No infrared there. Thanks for watching!
You do look like the kind of guy who would model for high-visibility vests.
I do look and feel better in a high-visibility vest xD Thanks for watching!
I am late to the beautiful Brainiac75 party but thank you. Thanks to the supporters too.
Nice job! Thanks.
Made my day!
Depending on the inner construction of your spectrometer, the IR peaks could be the higher order reflections of green off e.g. a grating used by the instrument to measure wavelength.
Yep, this seems to be the explanation based on the feedback in the comments. Makes sense, since 2nd order 522 nm diffraction will overlap 1st order 1044 nm diffraction. Completely overlooked this, even though I mentioned something similar in the previous video x) Ah well, I'm new to using spectrometers. I will get better at the art based on your feedback - thanks!
@@brainiac75 Glad that you've figured it out! We've got several different optical spectrum analyzers in our lab, and all of them seem to do that, even the huge high-resolution HP/Agilent beasts. This is just inherent to their construction. I guess if you intend to measure emission from a system where you suspect harmonics, you need to do it separately for each region, using appropriate filters to block the other part of the spectrum (just like you do with safety glasses and IR card in your videos).
I enjoy your laser videos.
The bluray 500mw laser at 10:20, where did you get that?
Glad you like it. The 500 mW bluray laser is a generic laser sold on eBay. Search for something like '405nm 500mW laser module' and get one that comes with the control board and AC adapter (close up and power test of it in this video: ruclips.net/video/c4RsQdyjgJE/видео.html ). I bought it from a seller called xspar but I think they are all the same...
2:25 I thought it was the norwegian flag at first😢🇧🇻
Very similar. Just misses the inner indigo blue cross :) Thanks for watching!
Years ago, in high school, I always wondered why green light was so crisp (red light was also easy to see) while blue light was so damn blurry. A physicist friend of mine later in college ended up actually looking into it.
Turns out there was some science behind that, and not that my eyes were defective (which I assumed was the case) :)
Blue is the most dazzling colour because it is scattered most (beam bounces around) inside the eyeball. That's why bluish LED car and bicycle headlights are much more dangerous tonight than traditional halogen.
Shouldnt such test be in a room with no external light to mix in?
That would be optimal, but no backlight in the luxmeter's screen, so I need to have some light on it to film it :) Thanks for watching!
7:34 first of all,"It's over 9,000"... Very beautiful very beautifully done. Second I have a question; I understand that our eyes are more sensitive to green light. I work with and sell pipe lasers that are green for this very reason. But that's our eyes... The lux meter... Why is it showing a drastic increase in brightness? That I don't understand. I mean I don't really know how a lux meter works exactly. I know what it's for, But is it supposed to like mimic the human eye or something?
Is there coorelence with wavelenght and eye damage? 1-5mw is the safe maximum... for any wavelenght?
The more powerful in milliwatts, the more damaging. Regardless of wavelength. That's why lux and lumens tells you next to nothing about how safe a laser is to use. But the output in mW does. Thanks for watching!
Nope. The human retina itself is red and hence gets damaged much more easily by non-red lasers because of the produced heat. Point a red and other colour lasers at a red balloon and test how much power it takes for the balloon to pop. Only a laser that can not pop balloons (not even black ones) can be considered safe for household use (including foreseeable misuse as child/cat toy). Please add this to your safety guidelines.
⚠ *Brightnes per watt does not make a laser more safe!*
@@AerialTheShamen hmm interesting, tell me more... i am asking for reasons
I want to build bunch of lasers (i need help with laser hosts..)
And i want all of them to be 5mw or whatever eye safe is, i essentially want multicolored toys...
Probably i'll just go with arround 5mw and call it a day
There was an eye damage warning campaign on tv news when green laser pointers became popular, with an eye doctor demonstrating the red balloon experiment.
This New York Times article mentions that green is absorbed stronger by the retina and so produces more heat:
www.nytimes.com/2011/03/01/health/01laser.html
Here is a brief note that wavelength matters with retina damage:
www.sciencedaily.com/releases/2018/01/180126130442.htm
No camera sensor was damaged in the making of this video?
Nope. Luckily the beam is moving very fast when the show laser is projecting an image on a nonspecular wall - making the reflected light eye- and camera safe (though I may be pushing it with such a small projection at a short distance). Notice how I avoid filming the steady dot when making the power measurement. The camera would not be happy about a 6 seconds steady spot from a 1 watt laser... Thanks for watching!
Amazing 🤩
Thanks - glad you like it!
I like the use of #GoGreen :)
Hehe, there are different ways of going green ;) Thanks for watching!
Over 9000 *and* there's no way that can be right. You almost could sneak the entire quote in there!
6:38 maybe the heat of the material emit the Infrared, because y'know lazer heat stuff and stuff emit infrared when gets hot, idk im not a scientist just a wild guess xD
Im guessing the UV light comes from the daylight hitting the wall and reflecting into the sensor
Thanks for the input. Needs further investigation - I'm new to using spectrometers. But another commenter may have solved it: It could very well be 2nd order 522 nm diffraction. That is in the same place as 1st order 1044 nm diffraction. Usually, 2nd order diffraction is not visible on the spectrometer, but this laser is so bright that 2nd order of the green could be detected by the sensor. Thanks for watching!
@@brainiac75 damn thats so interesting! awesome! Keep up the high-quality content ;)
i love this channel
Can a lasercube run on dmx?
*OVER 9000*
wow, its power level is over 9,000, neat
i wonder if you fiddled with the position of the sensor and reflective surface to get it to line up the reading of over 9000
You are an awesome youtuber you should be making more money!
Thanks! I am far from being able to make a living from my videos, but don't worry. I have a dayjob too :)
Thats so interesting ! Is there a similar value for which frequency our ears are most sensitive to ?
Actually there is. If you search “Equal-loudness contour” in Wikipedia, you will see a set of curves that all have a minimum around 3 to 4 kHz, which means our ears are the most sensitive around those frequencies. The actual frequency depends on the intensity of the sound and other factors like age or just differences between persons.
My guess as to why it are those frequencies, is because they are important to understand speech. I only hear up to about 2kHz with one ear, and understanding people with only that ear is extremely difficult.
Good question. Green light is the most common light in the typical human habitat, there's probably a sound frequency that's more common than others
Smoke alarms beep at the most sensitive frequencies. That's why they torment so much despite the small battery. Ar bass range you would need 100W to feel as loud.
It is likely your reading equipment is reading an overtone that doesn't exist. Our ears do the same with sound. Two tubas playing the same note very cleanly will clearly create multiple overtones in what is heard. Those higher notes are not actually being played, however our eardrums still perceive extra octaves. Same process as electrical vibration.
Braniac! What does the luxmeter say about the laser's power level?
It always seems to be green lasers that idiots shine at aircraft.
I guess those must be the more advanced kind of idiots then, who are just smart enough to figure out that green lasers are the brightest, but still too dumb to understand the consequences of their actions…
green will dazzle, IR will blind
Over 9000!
Its odd that growing up, I always loved neon Green the most. Maybe I recognized its vibrance.
me too
random observation, but are the safety laser goggles similar to being colour blind? I have a pair and it blocks or limits certain colours. (190-540&800-1700nm OD5+)
4:43 ~400nm area --->- is some weird colour. cant see the blue and the green overlaps with blue. yellow is basicly organge and red is more orange ~700nm -
i.imgur.com/n1GIiAi.jpg for reference
I know next to nothing about color blindness, but makes sense if the glasses blocks the colors that color blinds can't see (or tell from another color). Thanks for watching!
Mike is a powerful red laser I wanted to old school 🏫
so is that why OLED TVs use green instead of yellow??
Kinda? The human eye can detect only 3 bands of colour: red, green and blue, which is why we use RGB for displays and projection. However, for printers and paint we use Cyan, Magenta and Yellow (CMY), because when you mix physical pigments together (like paint) the result is darker than the original, so instead of adding to black to get our colour (like RGB light), we subtract CMY from white (our white paper background) to get our colour.
That infrared might be heat coming from the computer or the laser. Maybe the heat from the diode will come from the inside of the diode same way as the green light does, as a laser light...
Thanks for the input. Needs further testing, since I'm new to using a spectrometer. Someone mentioned it may be the 2nd order of 522 nm coming from the diffraction grating inside the spectrometer. So a 'false' reading where the 2nd order of 522 nm is picked up as was it 1st order 1044 nm infrared. Sounds very plausible to me.
Thanks for watching!
@@brainiac75 you can measure the output through the infrared filters. Interestingly, this wavelenght wasn't on the lasers you measured previously... hard to say
Red colour is my favourite still
I got tired of red back in the early days where a weak, red laser was all I had for years... But today I do enjoy a powerful red laser beam. Thanks for watching!
@@brainiac75 I made my first red one in 1990th from a scrapped CD player. I even tried hard to add a current regulation circuit from a magazine to protect the diode (likely a resistor would not be worse), but the thing was so dim that it was barely visible (and grew dimmer when heated up), But it was stil exiting to see the grainy red light and how it formed stripe patterns when shining through fine cloth and such simple things.
Could it be possible that the laser is heating up the surface it's hitting, and causing the surface to release infrared light due to heat? I have no idea why it would be exactly double the wavelength, but it's not too much of a stretch to suppose that it'd be related.
Thanks for the input. I would expect heating to be a more broad band in the infrared. Could be interesting to test it with a laser burning some wood etc.
Another commenter may have found the solution: 2nd order diffraction of 522 nm light is in the same place as 1st order diffraction of 1044 nm light. With a very bright light source, the spectrometer may pick up the 2nd order diffraction - a false reading in infrared.
I couldn't belive when i heard ''it's over 9000'' (with such calm voice too)
OVER 9000!!!! 😁 😎
The IR you are detecting is from ambient light
Thanks for the input. I would expect ambient infrared to be a wider band - not a peak, but it needs further testing. Someone suggested it may be 2nd order diffraction of the 522 nm light inside the spectrometer. 2nd order 522 nm is in the same place as 1st order 1044 nm infrared, so seems very plausible. No infrared - just a 'false' reading on the very, very bright 522 nm light.
What protection glasses do you recommend for a 450nm blue laser? (10W)
i dont know this laser is too bright to be legal
Video uploaded a minute ago and people here are commenting how cool and exciting the video is which is almost 12 mins big
I guess they know from the intro where this video is going ;) Thanks for a fast watch after upload!
it is my favourite colour too :)
Went to wickedlasers, but couldn't find a green-only laser, only the RGB cube. Who has the green one for sale?
Sorry, it is an experimental laser. I don't think they will market it. It is too specialized over any other RGB show laser. The brightness is absolutely fantastic, but the lack of all other colors is a bigger downside. Thanks for watching!
Have they by any chance gotten close to making hologram objects with specific laser designs??
It’s videos like these feed my obse... INTEREST in the color green
I removed the harmonic crystal that converts infrared to green in my green laser pointer and now it's only emitting 1064 nanometers.
I noticed how much brighter the green laser was when I got red, green, and blue lasers of the same wattage.
3:30 its over 9000!!!!
what is the function of the springs behind the lens of a blue laser?
Sir, you hit upon a very good point, but please allow me to reconfirm with you that the info you have been given is independently corroborated: Can yo tear it apart to Mae sure it is NOT in actuality an infra-red diode with a "green filter so to speak" over it. This is not an uncommon practice. The infrared peak is coming from the laser and the green light may be obscuring detection otherwise. I should want to get in there and personally examine that diode. Thank you very kindly. Thor
Thanks for the input. It needs further investigation, since I am new to using spectrometers, but another commenter pointed out it may simply be 2nd order diffraction of the very bright 522 nm. 2nd order 522 nm is at the same angle as 1st order 1044 nm - fooling the spectrometer into believing it is infrared. Sounds very plausible to me. I have found no info on infrared coming from the Nichia NUGM03 diode used in the laser.
Why does the green venomcube appear as though the animation has glitches?
To measure lumens you need to setup an optical integrating sphere...
could you set the rgb laser to only green and compare them? Would it be brighter than the only green?
I wonder where the 2 watt krypton lies. Or was it only 1W? I forget.
Nappa: Vegeta what dose the Lux Metter say about the green lasers light level!?
Vageta: Its over 9000!
Nappa: What, 9000, thats impossible!
I used to do this really REALLY stupid thing as a kid, I took a red laser pointer, and just looked directly in to it while it was on, because it looked like pretty, now my eyesight has definitely degraded but somehow not to the point I need glasses.
I remember when I was a teenager and got my first red key chain laser. They were rare back then, so I showed it to a kid in my family. He desperately wanted to try it, so I gave it to him repeating out loud: Don't point it into anyone's eye!
The first thing he did was to point it into his own eye... Luckily the laser was only ~1 mW and the blink reflex kicked in saving his eyes from any damage. But it shows you were not the only one and laser's are not kids toys :) Thanks for watching with your remaining eye ;)
3:30 IT'S OVER NINE THOUSAAAAAAAAAAND!! *dies from old meme mold*
So when you cooled the green laser it stoped being visible, but what happens if it is heated up instead?
Isn't this the reason night vision is usually green?
yes
One thing i dont understand, yes our eyes perceive green light to be way more brighter then blue light, but a lux meter ? wouldn't it measure the same ?. For example two 200mW lasers (532nm and 650nm ) tested both have the same power, to our eyes the green one will be much more brighter than the red one, but to a luxmeter wouldnt it be the same " brightness" ?.
It could be possible that the infrared that you are detecting is background and is not coming from the laser itself
what would happen if you would use a monster magnet on molten iron?
about lasers..... It may be (it IS by the way) dangerous but what could happen when, in a safe location, you combine all of your lasers with an optic? or into a single point? what if this beam meets a magnet?
Fun fact:You can see TV remote controls flash of Infrared radiation using your devices camera try it out (because your devices camera can see a bit more than the visible spectrum)
Also because TV remote controls use Infrared radiation so that's how TV's know what button your pressing. Try it and you'll believe me.
If I have a wrong grammar don't blame me English is not our primary language but secondary.
FØRST :D Takk for video
nope you're about 10th place
@@OctoBirb8Claws 😓
Første dansker? Tak for altid at være tidlig ude, Anders :D
Jeg tror Anders er fra Norge. 😉
he said it
I guess 175-190 Lumens but that could be well below my doubtful back guess in my mind over 315 Lumens
Brightest isn't necessarily the best... DPSS lasers will outperform single emitter diode lasers in beam quality and specs as well. When expanded a decent quality DPSS laser produces a nice round beam. But this depends if the pump diode is a single mode or a multi mode, a multi-mode and uncorrected pump diode will translate into a more oval output beam.
One thing is for sure green DPSS is the best laser to work on and how to learn alignment and a bunch of other nifty things for a hobbiest.
🤟🧐
Best sure is a subjective thing ;) Thanks for watching!
@@brainiac75 depends how you look at it... and only if power is not of concern 😜
What!? 9,000? There's no way that can be right.
3:32 wasn’t expecting a meme there..
Holy s**t ! I’ve guessed the right lumens ! I guessed around 500 lm and it’s right even though i didn’t calculate it :-3
I just wish that other lasers could be anywhere near as good, id love an efficient purple-blue laser