Strongest LASERs in my collection | Power and wavelength measured
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- Опубликовано: 24 ноя 2024
- It is time to test the strongest lasers in my collection, now that I have both a laser power meter and spectrometer. I can test both power and wavelength of the strongest laser for each laser color I own.
I have 11 colors in my laser rainbow, so hang on for an epic journey into the lasers in my collection. Many of which I haven't shown in a video before!
LaserCubes donated by www.wickedlasers.com
My Patreon-page: / brainiac75
Did you miss one of my videos?: / brainiac75
Other laser videos of mine:
About infrared leakage: • THE ISSUE WITH GREEN L...
More about infrared and bad safety glasses: • You can see infrared?!...
Lasers drift in wavelength with temperature: • Lasers drift with temp...
1 watt LaserCube: • LaserCube | Power in a...
2 watt LaserCube: • LaserCube 2.0 | They D...
FULL MUSIC CREDITS
Timecode: 0:01
"Darkness is Coming" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100584
Time codes: 0:37 + 13:22
"Music for Manatees" Kevin MacLeod (incompetech.com)
ISRC: USUAN1400009
Time code: 1:09
"Perspectives" Kevin MacLeod (incompetech.com)
ISRC: USUAN1300027
Time codes: 4:31 + 12:25
"Clear Waters" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100290
Time codes: 5:49 + 11:20
"Long Note One" Kevin MacLeod (incompetech.com)
ISRC: USUAN1100418
Time code: 8:37
"Hiding Your Reality" Kevin MacLeod (incompetech.com)
ISRC: USUAN1700081
All music above licensed under Creative Commons: By Attribution 4.0 License
creativecommons...
Time code: 12:51
Mix of two tracks:
1) The Shimmering by fran_ky (freesound.org/s/237363)
Licensed under Creative Commons 0 license
2) "Spacial Harvest" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons...
ISRC: USUAN1100653
#LaserCollection #Spectrometer #Brainiac75
I wish styropyro would see this, and he would be " Hold my beer".
He probably has the most powerful hand held laser in the world
@@Kitchen6419 at least he had at one point but I Think he dissasembeled it for parts.
Yeah I thought of his tattoo removing laser that was over 1 megawatt pulsed and strong enough to destroy the CCD in his camera with indirect exposure.
@@Kitchen6419 he does ruclips.net/video/W6FbUiiwutQ/видео.html
69 likes, nice!
Everybody gangsta till the diode starts to get old
Nice profile picture
NOPE gaming why thank you. The artist is QuinNSFW (something like that, and yes, it is nsfw)
where can i buy this laser
This video was total nerd fuel, I love it.
Thanks! My enthusiasm for lasers is definitely on an über-nerd level - as with many other science subjects x)
@@brainiac75. Same here, I'm sort of a laser Collector/enthusiast, I have about a 100 of them.
Everything from about a few miliwatt, all the way up to 2.5 W focusable blue, that will ignite cardboard instantly, especially when focused, When focused it will ignite steel wool.
I also have a 500 milliwatt laserlands green lab laser, that is no slouch either.
Just recently added a one Watt green laser to the collection.
I love how he uses cd cases and clothes pins along with all these instruments in his tests, it gives that homemade touch. Thaks for the video!
Thanks Joseph :) I am still an amateur though my equipment may be getting more professional over time. Clothes pins are so useful - featured in many of my videos :D
@@brainiac75 it's kinda cool though, i love lasers their color and your video is just awesome i really liked the video you earned an sub from me
styropyro : laughs in 200watt
Yeah, he certainly has me beat on all wavelengths... But hey, I have my neodymium magnet collection too ;) Thanks for watching!
@@brainiac75 You tell'em Braniac!!.....Also tell 'em we hear faint evil laugh and soft voice from a lil skinny guy that's always saying,
"But we don't do a measly 200watts..........do we Boys?" xD
Hope Photonic is doing alright these days.
@@brainiac75 Styro: *combines them both*
@@seantaggart7382 Next video: StyroPyro and Brainiac75 Collab: Playing with magnetic fields and lasers to create a 90° corner laser beam without a physical object
@@brainiac75 I am 13 yr old and i learn a LOT from ur videos about magnets i even have a lower grade version of the death magnet and i have other pretty big ones.... thanks for telling the proper handling of magnets to me!
Physicists: Pretty LASERs
Engineers: Pretty LASER-measuring test equipment!
Accurate
styropyro:big scary f***ing lasers
Republican's: pretty light go bye bye.
I have a Wicked Lasers Spyder. It is terrifying, and I am so glad it has a code to turn it on. Most people do not understand how dangerous these are.
The spectrometer you are using uses Toshiba TCD1304AP linear CCD sensors. It has extremely poor sensitivity above 1000nm, and almost nothing above 1100nm. For this reasons, you need to calibrate it first. One of the better option is to use incandescent light, fit in the Planck's law distribution, and use that as a calibration. It will help a lot, but will still make upper end of spectrum noisy a bit. I am not sure if the software provided with the spectrometer allows doing it internally, but if not, it can be done using external program, or even a spreadsheet.
I was about to drop a styropyro joke, but after reading the comments, I believe I was not the only one so nevermind. Great video
You can drop a Zenodilodon joke :P
Hehe, you sure have me beat on most wavelengths, Zenodilodon. Love your channel by the way. Makes me want to get into DIY laser pointers.... Thanks for watching!
@@brainiac75 You have an excellent channel yourself! I am trying to work out of laser pointers a bit, I want to get some serious hands on optical physics work going, there is so much to learn still. My goal is to eventually make some crazy laser heads and get into more advanced things like custom SHG/THG. Honestly I kind of find pointers boring as you can only really collect colors and burn things. Currently I just want to help others get better with working with laser technology as I found it really difficult to find good sources when I started.
When a long time ago I worked in the paper industry, I read all kinds of articles about really powerful lasers used or tested for paper (and other materials) cutting. I particularly remember that some people tried how thick packs of paper they could use. They were talking about kilowatt level of power in continuous mode. 10600 nm wavelength CO2. I never was dealing anything that power levels. My experiments were limited to some angle finding using helium-neon laser. Later on, diode laser pointers emerged and I bought a couple of them -- still have both!
But the real reason for my comment is that at one time I was involved in an attempt to measure, and potentially control the paper web moisture content immediately next to the dryer cylinder. The idea was that measuring the water vapor content would tell the paper web moisture content, or at least tell something about the moisture variation. And somebody had an idea that to be water vapor specific, you would start with water vapor laser. Of course. Sad to say, we were a bit amateurs and did not have a matching wavelength detector available. It appeared the laser probably worked but our broad band receiver saw all kinds of wrong phenomena.
BRANIAC:-" I GOT A 1.5 W POWERFUL LASER"
STYROPYRO:- "MAKING IT MORE POWERFUL"
ALWAYS remember guys, these lasers are no joke. And many of these can instantly want to have a rewind button in life.
I always try to leave warnings on laser videos because it's one of the most deceiving things to people who have no experience with them beautiful light that can put your eye out faster than you can blink literally ! :)
@@christopherw2233 ur a good guy
@@MP-tz2yn it'ss hard to find people in the world who actually care about each other sadly.
@@christopherw2233 true. You do a good service putting the warnings, the dots look so innocent - I had to do some reading myself about it and was shocked to find how quick it can blind you
You totally make the infrared spectrum sound sinister with the music. Love it!
I always enjoy your videos for the longest time, and have help a lot to become more aware with quality of laser pointers and the dangerous fun with magnets!
Glad you like it! I often spend quite a time finding the right track and timing it to the video content. Especially the Hercules chapter took a while just for editing the music track. Thanks for watching!
@@brainiac75 How did you figure out the diode they use for their lasers???
@@brainiac75 I mean sanwu lasers*
"Klick like to celebrate it with me" 😭 yes I will😌
Awesome! Party has begun :D
Styropro be like nah..!
Oh, yes... Styropyro must have me beat on any and all wavelengths x) Thanks for watching!
Ahem 100w cow handheld laser
@@brainiac75 No worries Magneto-Brainiac!! Sith Styro cowers as he hears that evil laugh from Emperor Photonic.
styropyro only beat him in doing utterly crap with very strong lasers, like putting things on fire, blowing up stuff, popping balloons, etc... I know styro from LPF forums and he a great person there, but his YT videos are utter crap IMO. and complete lack of the actual fascination of lasers from an adult and mature perspective..
it's a pupe-fetich seeking the lowest common value of yt-clicks from mainly the very young pupe-crowd by doing stupid stuff with high-powered-lasers and blowing stuff up, and it ain't really young kids you want messing with high powered lasers. and its acts like that give lasers a bad rep. and likely also why makers go out of their way to make these high powered DLPdiodes not available for the public, not least hence these new multi diode-arrays where even spec sheets it hard to find and close to impossible to separate..
@@JAKOB1977 what do you do with your high powered lasers?
Lasers have always scared the shit out of me. Not like, viscerally, but with how often I get those sort of dangerous intrusive thoughts, I know I’d just end up blinding myself.
It would be so easy, in a couple of seconds, bam, no vision for the rest of your life.
Not to be unkind, but you seriously need to get help. Good luck.
Yeeesssss, you're back!
Thanks, though I haven't really been gone that long?: ruclips.net/user/brainiac75videos
@@brainiac75 I haven't received a notification for your last two videos, and I have the bell turned on
@@brainiac75 i havent recieved notification for your last vid either , and have the bell on ! And l thought u were under a lot of work and thats why there s no vid
Styropro made a 100 Watt laser a few Month ago.This is just insane.
Informative as usual Brian. It is amazing about the IR leakage from the green laser range. Perhaps you could get some, preferably the Chinese ones, and test the actual mW and IR. I would not be surprised if some of them output Watts and not mW!! :) Cheers.
Thanks :) I measured one of my garden/decoration lasers in a patreon video, and it seems like half of the output from it is in the infrared.... That's so bad. I may make a public video on it, since I now have better equipment for showing and measuring the issue.
@@brainiac75 Wow, it has been a long time for me to catch up on things Brian. This reply from you makes me very nerveous about going forward. I hope people lean from these comments. Cheers.
I’m a studying laser technician an perhaps I can help you with what you’re seeing on the Hercules laser. I believe you are seeing what are called longitudinal modes aka standing waves. These are wavelengths of light that are able to exist in the laser cavity due to the constructive interference of the way you laser cavity is configured.
I love your videos ♡ always so calming! :)
Thanks :) More to come!
1052nm is a weaker lasing line of the neodymium. These crystals can lase at many different frequencies and at many different efficiencies, but they can fight each other for gain. The "correct" line is chosen with a dicroic coating on the facets, but these coatings aren't perfect. Sometimes other lines sneak in. I once had a green pointer that lased at 532, 537, and 542nm simultaneously presumably due to a coating defect.
1:10 "Dilda"? What an unfortunate name for things looking like this ;D
Hehe, I think it was nicknamed Dilda for that very reason ;) And ILDA is a standardized interface for show lasers, so a fitting nickname indeed.
So good it's a shame it ended. I used to work in a facility which made lasers for communications, some of those go towards the long end (or beyond) of your new power meter. You can sometimes pick up those on eBay for very little, do a search for something like Nortel Laser. They are not hugely powerful but some can be wavelength tuned.
Thanks :) Some of those Nortel lasers do look interesting. Wavelength tuning would be nice to experiment with.
I remember the first time I saw a laser pointer. It was in the 90's, it was already the keychain model red one. I was inside some kind of small mall and saw that red point fast on the floor, my first thought was that it was a cigarette butt but then the guy showed in his hands to some other people, everyone amazed. Now it is so common but still something awesome.
Since you asked... I've got you beat on the blue laser, mine being the 2W version and the calibration sheet showing ~2.5W. I didn't really believe that rating at first and thought they were probably inflating the numbers a bit, but after seeing how close yours was, maybe it actually that stong.
Also, a faster way to get the max power setting is hold down the button while powering on, then when you press the button it is on at full power, and shuts off when you release it.
I just have the same type of two blue beam handheld laser pointers in hands right now like yours. What a powerful baby ！ ❤❤❤❤❤❤
What a great beautiful science channel ! I've always watch some videos from it when I'm bored, or just to warm up the 4200lm halogen lamp on my InFocus projector. It has some DLP technology too ! I'll love to see Brian talking about DLP technology in general...
Edit : And... Maybe do some weird experiments with DLP chip.
Damn that HeNe laser has a clean output, they sure don't build em like they used to
Nicely done sir
You should definitely do a collab with styropyro! 😀
The only thing I can guess is that you had some neon nearby that got excited by the intense 532nm laser light. Maybe an exposed He-Ne laser tube, or even some gas-discharge tubes with a penning gas mixture inside?
Missing yellow laser get one! Good videos💪
A yellow laser sure is high on my wish list. They are just so expensive and inefficient :( The show laser will make a strong, yellow looking beam though. It is just not a true yellow laser... Thanks for watching!
I've had a green laser similar to the pen laser you showed for about 12 years now. I just bought a 445 Blue Laser but I rarely use it. I'm not only afraid for my eyes but also for my 9 yr old daughter's eyes. I bought two sets of laser protection glasses but not 100% sure they are the right ones. I mentioned two rangers with a gap between the two spectrums.
It would be nice if someone would do a video on the different ranges of Laser Safety glasses and which laser light they protect against.
Your videos teach me more science than my school
i also have a half watt green laser, and in addition an 1 watt blue laser, but my favourite is my E3 wicked lasers green one laser, who often still use... great video btw!!! (i wish i'll buy the sanwu laser power meter!!!) happy new year!!!
wow ... great video thank you much 👏
What can you do to resurrect the oldest laser that was 4mw and is now only 1?
Any way to fix it in your home shop for a RUclips video?
love the slightly ominous music making it obvious how dangerous these are
I love your videos Danskjävel! ❤️
Thanks, fellow viking x)
That smile your sporting is almost as big as the monster sized laser you have there! #supperstoked
Its good to know I'm not the only geek obsessed with lasers. I once had a boss tell me he would fire me if I said laser one more time after spending the better part of a week talking about lasers.
Great video!
The battle has begun... Styropyro vs braniac75
Very interesting channel! Thank you for making videos!
No really high power lasers, but I love the 488nm ones and have built 2, both underdriven to around 30mW and a nice direct injection green diode at 515nm and 15mW. One of my 532nm DPSS lasers leaks around 7mW of infra red.
Weeellllllllll I think I have your Wickedlaser beat at 60 trillion watts of 351nm UV laser pulses of 30 kilojoules each. (but to be fair....that's at work) ^_^
I really don't know what that line at 1153nm is. I thought maybe it was the second lasing line of NdYAG, but that's at 1123nm and your spectrometer's resolution is obviously more than high enough to resolve those two wavelengths. Maybe it's fluorescence or Raman scattering of the laser power meter material?? Anyway that's a nice spectrometer, I really like it. It's substantially cheaper than an Ocean Optics unit and seems to do about as good a job. I've been looking for something inexpensive like this to take spectra of various phosphorescent materials.
That sure is a monster pulsed laser. UV lasers scares me no matter the power... Not really suitable for home use ;)
That 1152-1153 nm peak sure is a mystery. Neon has a spectral line at 1153 nm, but there's little to no neon in the air.
It could be the coating material of the laser power meter reacting to the very intense Hercules laser as you mention. It may not be the overall strongest laser in my collection, but it is the most intense with high power in a narrow beam.
Yep, I chose the Lasertack LR2 (actually made by Aseq Instruments in Canada) since it seems to offer great performance for way less than the more established lab suppliers. Though, the LR2 is still expensive for my budget :) Thanks patrons!
Brainiac:1mW to 200 mW
styropyro:200mW to 1mega What
Thanos 5w is my most powerful. Havent used it on a spectrometer, but labeled as 445nm and color seems correct enough... friend has the power gauge for it (why can I not remember the technical name?) But the 5w laser was actually putting out 5.7w on fully charged 26650 batteries
I love lasers. I have a laser pointer which is black with gold colour focus and a gold coloured battery cap at the other end with a pen clip on the side also gold coloured. An old boss of mine gave it to me, he said it cost 80 dollars back then probably in the 90s. still works.
Nice, sounds like a collectors item to me over the endless black/silver laser pointers available today. Continue to take good care of it :) Yes, laser pointers used to be very expensive. I paid around 500 DKK (~$75 in todays currency) for my first
Brainiac was having so much fun when he activated the 1w laser. You could see it in his face.
It just is a boy's dream come true. When I was kid, no lasers were commonly available or affordable - not even the simplest key chain red laser pointer. When I was a teenager red laser pointers became available. But not very impressive - under 5 mW in the red is not really bright. So being able to light an entire room with a tiny laser spot and actually seeing the laser beam midair with no smoke... Absolutely amazing - would not have believed it would be possible in my lifetime as a kid:D
Nd:YAG
Pulsed laser
KTP
DPSS laser
Er:YAG
IR light pulsed laser
(Old school laser)
Ruby laser
One of the first lasers ever build.
Co2 laser.
Old laser, used by wood CNC
Brainiac75: I have the strongest lasers!
10W laser cutter modules: Am I a joke to you?
The background music made the leakage very intense :P
Cool, Is it more powerful than styropyro's most powerful laser?
always like your back ground music,it so works
Thanks! I went through a lot of tracks until I found just the right one for the Hercules chapter. It fits the mood I was experiencing just right :)
@@brainiac75 you make the right choice on all your videos having seen them all thanks
The dramatic sound effects had me dying at this nerd jargon... And intrigued.
Lots of 808 and 1064... Oh NO!!
My kind of dude,he celebrates his lazers birthdays. lol Some badass lazers man.
Really loved this video, very charming and relaxing. My favorite laser in my collection is my 5.5W diode laser at 405nm which I attach to my 3D printer to cut and engrave wood and other things. I love that a small and relatively cheap add on can add so much functionality to the machine. I also have 2.5 and 0.5W diode lasers attached to the printer, all through a custom switch box I designed and printed and which has those big chunky old style metal switches with a satisfying click. The power circuit for the 5.5W laser causes a bit of latency in the PWM signal that I use to control it so it's not as precise as the weaker ones which I use for more detailed engravings, but it burns through 3mm thick wood in a fraction of a second which give me great joy. Of course I could get a CO2 laser cutter that would blow it out of the water but those are expensive and huge and I like the DIY aspect of the diode lasers.
A 5.5 watt diode that's insane I don't think I would have any use for that even if I could make it work in a pointer or need it to cut some things XD my strongest is probably around two Watts.
First time here, i keep seeing people disable lights and cameras with these from like a few yards away and got curious which watts would do that and what (if any) level makes it refract off of the glass
what a difference a couple years makes. ~5w blues are all over fleabay now. At under $200, I just had to grab one. I paid a little more than average for the 465nm. Now to wait for the slow boat from China!
around 6 years ago, i got my 1.5W 635nm red and a near-4W 450nm blue stolen from me. Few years later and i now own an 11W+ blue that i built, a 1.6W 520nm, and a 300mw 488nm as my three favorites. I'm also planning on building a 50mw 505nm into a pen housing along with a 3W+ 405 that is going to use two diodes, just like my 11W build. I'll edit this in the future and discuss how it goes.
Nice collection! Hope you have a fire extinguisher at hand ;) I really need to try building my own. Great value for money.
Now every laser video on RUclips is styro pyro meme fuel.
You definitely need 462/465nm, 510nm, 520nm and 525nm in your collection! :D
Is there a way to convert the wavelength of CO2 lasers? Like they do with the green lasers? Wouldn't that be crazy bright???
CO2 lasers are incredible strong (and bright), but their 10600 nm infrared light is so far from our visible range. I don't think we have technology that can convert 10600 nm infrared down to the visible ~400-750 nm range. Would be awesome though!
Meget spændende video. Mange tak :-)
Velbekomme :)
Hercules, I don't spend that on a holiday 😂😂
Nice Collection
Great stuff! 👍
Nice video, i got the same Arctic laser from Wicked Lasers, i bought it as a 0,7W and when it came with the test sheet, it peaked at 1,47W. Did you also buy the 0,7W or 1W version?
Hi Rasmus. You got lucky with that Arctic then :) I bought one that was specified as over 1 watt - not 0,7W.
@@brainiac75 That's kind of annoying to get a laser weaker than advertised. Wicked Lasers make some good lasers but there is a lot of controversy wether people are actually getting the laser they buy. Sadly i don't have a power meter to see if the 1.4W is true, but it can easily light up a match from 20 meters away with no extra lens to focus the beam.
Because you asked. I have a 1516mW 445nm laser. It’s kind of nuts so don’t use it often. It looks like yours, but runs two 123 li-ion rechargeable cells. And it doesn’t have the power ramp up modes, just on and off.
Much love my dude
I love the music with the HERCULES.
May I ask why did you censor the serial number on the blue laser? Btw really interesting video :D
Thanks :) I censored the serial numbers on two lasers for privacy and partly for insurance reasons. I didn't censor the serial number on the HeNe laser. It is from 1988 and not possible to track back to me...
@@brainiac75 ok, thanks :)
What happens when you discharge a capacitor into a cheap laser diode? Can it have a higher pulsed output?
Yes, but only for one pulse... Diodes will draw all the current available to them until they fry themselves from too much current. Power supplies for laser diodes need to be current limited. But pulsed lasers can be very powerful. Much more than continuous wave (CW) lasers. en.wikipedia.org/wiki/Pulsed_laser
You should look into building a DIY spectrometer. It would help out a lot of the DIY optics and laser community… And bring a lot of people to your channel!
There really isn’t a good professional DIY spectrometer that is open source… At least I haven’t been able to find one. There are a lot of nice DIY versions but they all end up looking like a cardboard box painted black. 3-D printing the case is a little better I guess.…
But for For 50 bucks on eBay, you get a solid aluminum enclosure (normally referred to as the optical bench) with the right geometry. It’s already been manufactured to perfection by ocean optics. Who makes some of the best budget spectrometers around.
Or For around $100 from the same seller you can get the optics bench, and all of the important optics needed for the instrument. All made by ocean optics.
Then all you need is the sensor and a bit of work. And you’re all set. you have a DIY $150 ocean optics UV visible spectrometer. Which cost about $1500 new.
You’re in a great situation to do something like that because it would not only be fun and enjoyable, but it would bring people to your channel and help out the DIY laser/optics community. And you already have a calibrated spectrometer so you could make sure the DIY version works properly
9:46 He is starting to BELIEVE!
I have a 15w blue laser module as listed on eBay. The real output power should be 5W continuous and 8w pulsed. It would be awesome to see it tested here.
I have seen them on eBay for next to nothing. May give it a try, though they obviously aren't 15 watts :)
@@brainiac75 I have reached out to a trustworthy Chinese seller(hopefully) who claimes the 15w blue modules with a separate driver board is 5W continuous and 8W pulsed. Looking forward. Many thanks!
GH05030C2LM(or newer model GH05030D2L) is an amazing while troublesome laser diodes. it's mint green is one of my favorite color, but as I have get several of 10 this diodes I found the actual wavelength of individuals are so vary that can be result color from malachite(510nm)
Happy holidays
Hey, laser hobby enthusiast here the diode in the cyan one is sadly the 488nm one is based on the sharp 488 sample diode, not the Osram one. The Osram 488 diode has better beam specs and a much narrower spectrum also it is exactly 488nm the sharp ones being engineering samples deviate in the range of 484- 495nm. as you can imagine the price for a single diode is more in the range of 200+ $, I myself have gotten lucky with a 481.7nm diode its pure deep blueish cyan. If you have any questions feel free to contact me on discord with any questions! ( Giannis_TDM#2782 ) also, the red one at 700 is the oclaro/Ushio 700mw diode at 638nm the diode on the WL spyder is either an A140 or A130 depending on how old the laser is. Also, You can join the styropyro discord if you want to ask me there I may be a moderator but don't hesitate to ping me anytime! (and personal collection as of now:
638nm red 417mw by me pen alu Sharp GH0637AA2G G2
Random flea market 303 doing(532nm) 100+mw
525 850mw custom by me brass 10440 pen host G8 (NUGM03)
505nm TBDmw custom host by me(diode in shipping)
488nm From copper 10440 pen host (In shipping)
481.7nm by me calculated 50-60mw 10440 pen host brass 3E
450nm 1400mw in my custom small form factor alu/brass 10440 host 3E
405nm 80nw Custom host alu
)
Have a good day!
Nice collection - and growing :) Thanks for the info on the diodes. It is so often not listed, which annoys me. I will keep your contact info for future reference.
I wanted you to do those Laser 303 and Laser 301
but good effort!
The unknown/unexpected farther infrared readings might be the radiation of the sensor heating up.
Might be. It just seems very narrow to me. Wouldn't heat be more widely spread over the infrared spectrum? And wouldn't I see it with the more powerful lasers (though their beams are wider and therefore of less intensity). Thanks for watching!
@@brainiac75 If it is heat, maybe it will shift over time as it gets hotter. It could be that specific wavelengths (secondary infrared included) heats the surface material more than others. The intensity and dot size differences between devices may play a rule too. However heat radiation should be indeed more widespread, maybe that changes with temperature as well. The alternative eventualities are the effect of optics or the age of the devices, including dust/dirt/moisture in the air or in the devices. My guess is still on the heat, though.
Maybe you can setup an experiment to investigate that in an upcoming video. Furthermore thanks for your Content!
3:50
Ignore the peaks from fluorescent studio lights
Me: doesent ignore reading texts.
the 1152nm peak is a dpss line that you can get with some self frequency doubling crystals like nd:svap and yb:ycob, it is a pure yellow when frequency doubled at 575nm, i have a 575nm laser using that process
These lasers are really scary. What do you do with them?
Well, I collect them out of a passionate interest. I am so old, that even the simplest laser pointer wasn't available when I was a kid. I tried building my own 'laser beam' with a flash light bulb, tubes and optics, but obviously failed.
Now that lasers are easily available - and quite affordable in a wide variety of wavelengths and power levels - I just can't help but buy them. It is a dream come true for me :)
I also regularly feature the lasers in my videos for scientific experiments and safety instructions. Many lasers are horribly mislabelled...
@@brainiac75 I think that's really cool! I'm just amazed at this! I study physics and use a titanium sapphire laser in the lab. It's pulse time is 2 ns and the optical power on the table is at most 150 mW and I am afraid to death of the thing. I would not under any circumstances want this in my house, that is why I am amazed at the lasers you collect! I would be very scared of them, if I had them I would not turn them on :p
I think it's cool you're sharing this with us. I'm glad to see you're responsible with them.
I love your voice it is just so satisfying:)😄
HeNe gas laser usually also emit 1152 nm! it is just IR filtered. the 1062 wavelength is the default, which is frequency doubled here to emit 531 nm.
check out the german wiki article for all possible HeNe colours!
de.wikipedia.org/wiki/Helium-Neon-Laser
Hey there! Consider using rechargeable lithium ion batteries in your lasers. Works much better than non recharging batteries.
Kay, now what I wanna see you do is take an I.R. filter and a visible light filter and put them in front of your leaky green lasers while holding them in front of the power meter and see how much power is green light and how much power is actually infrared light.
With what's going on with the police getting lasers to their eyes, it would be interesting to see this meter show some results from low powered lasers 1-5mW, just to see how much over their rating some of them go.
Regarding the peak around 1152 nm, I've seen a few explanations here, with some saying that it has something to do with water or blackbody radiation, but I don't see how these explanations could be true or actually explain anything at all, so I'll give this a shot. Disclaimer: I'm more of a small-molecule chemist who deals more with absorption of dyes than emission, so I only have a basic understanding, but I'll do my best. Perhaps this is either a demonstration of Cunningham's law or this will invoke it.
With this being an 808 nm DPSS laser and emitting at 532 nm, it sounds like this is a AlGaAs diode and a Nd:YAG or Nd:YVO₄ crystal, so that's what I'm basing this explanation on.
A material has electrons at certain electronic energy levels, but there are also "virtual" states that are not populated but essentially correspond to the energies that electrons would have were the material to gain electrons or excite electrons to this virtual electronic state. A material may absorb a photon of light whose energy corresponds to the difference between the energy of an unpopulated/virtual state and a lower-level populated electronic state; the specific terminology that's used can vary depending on the material, but the lowest-energy photon that can be absorbed involves a transition in what may be referred to as the "HOMO-LUMO gap" ("highest-occupied molecular orbital" and "lowest-unoccupied molecular orbital" respectively) in small/individual molecules, or a "band gap" in periodic materials and semiconducting applications.
For a fluorescent material, we absorb a photon, which excites an electron to an electronic excited state. However, these electronic states also have vibrational states. We need to modify the previous explanation to include this, as the excitation isn’t as simple as “ground electronic state to excited electronic state”. Each vibrational state in each electronic state has a wavefunction that describes it. And while the excitation *process* happens nearly instantaneously in comparison to the change in any atomic positions, an electronically excited state would ideally have different internuclear distances due in part to the change in electron density in a particular region of the material, and we end up getting the anharmonic oscillator curves for our two states of interest being somewhat offset instead of one energy-nuclear-coördinate curve being directly above the other. When we move to an electronically excited state, we need to not just go to the vibrational ground state of the corresponding electronically excited state, but we also need to go to a vibrational excited state whose wavefunction has good overlap with its current electronic and vibrational state’s wavefunction (with a particular state being more statistically probable with better wavefunction overlap), which may very well be higher in energy than the vibrational ground state at that particular electronic excited state. This is the “Franck-Condon principle”, and the jump between these two states is referred to as a “vibronic transition”, with “vibronic” as a portmanteau of “vibrational” and “electronic”.
Once we’re in the vibrational excited state of our electronic excited state, it may relax to a lower-energy vibrational state in the same electronic excited state, with the energy lost in this relaxation typically given off as heat. Once we’re at this lower vibrational electronically-excited state, the electron may jump back down to a lower-energy electronic state in a similar process: by a vibronic transition to a vibrational state of the particular lower-energy electronic state that has good wavefunction overlap with its current state’s wavefunction, which may very well be higher in energy than the vibrational ground state at the lower-energy electronic state. The energy lost in this vibronic transition - similar to the case of excitation - is through a photon, this time being emitted from the material.
Because some of the energy delivered by the absorbed photon may be lost through vibrational relaxation, the emitted photon is (with some exceptions) likely to be of lower energy (and therefore longer wavelength) than the one that was absorbed. Additionally, because the destination vibrational state isn’t necessarily the ground vibrational state, this energy may be even lower. This is why in fluorescent materials, we typically excite with a shorter-wavelength/higher-energy photon and observe a longer-wavelength/lower-energy photon. The difference in energy between the higher-energy absorbed photon and the lower-energy emitted photon is referred to as a “Stokes shift”. There are some unique cases where the opposite can happen, referred to as an “anti-Stokes shift”.
In the laser, we have a diode emitting 808 nm photons, used to excite the fluorescent Nd:YAG crystal through a vibronic transition. After some vibrational state relaxation, there is then a vibronic transition back to the ground state, which gives off principally lower-energy 1064 nm photons. These photons later enter another crystal (probably KTP), that has a particular structure that allows for processes called “sum-frequency generation” and “second-harmonic generation”/“frequency doubling”. Frequency doubling is what happens in this crystal when it absorbs two photons of the same energy and emits one photon that is double the energy (i.e., the same energy as the sum of the two photons), in this case taking in two 1064 nm photons and emitting one 532 nm photon. This is the green colour that we see from the laser.
A major reason for the broad wording of this explanation is because it describes the main process for the function of our laser, but isn’t too specific to exclude how we get the 1152 nm photons. I had mentioned that the vibronic transitions happen between wavefunctions of good overlap, with a particular transition being more probably if it has better overlap. When a process isn’t particularly probable, but the event is occurring with such incredible frequency, we may occasionally observe the less-probable events.
With some probability, there will be a different vibronic transition. In a harmonic oscillator model, the vibrational energy levels in a particular electronic state are equally spaced; while we’re typically dealing with anharmonic oscillators where this no longer applies, in some cases we can approximate the spacings as being equal, or can do tedious calculations to get some more refined individual values if needed. We’re able to use some other data to find the difference in these vibrational energy levels to calculate the energy/wavelength of emitted photons for other vibronic transitions, with the next Stokes wavelengths after 1064 nm calculated to be 1091 nm, 1120 nm, 1146 nm, ***1150 nm***, and 1182 nm, with the second-to-last listed being pretty close to what was detected (whatever the margin of error may be).
There are differing probabilities of each of these vibronic transitions occurring, and there are some reasons why we might not see their second harmonics, but the other Stokes wavelengths listed may actually be generated more frequently than were observed due to another factor: there are typically a number of points within the apparatus where there are coatings that attempt to block transmission of some wavelengths and allow others to pass through. The output collector prior to exiting the laser typically has a coating intended to block wavelengths from somewhere below 1064 nm up to usually 1200 nm, but there is an optimal range of wavelengths that it can block that decreases in opacity toward the ends of this window. It would take a fair bit of work to figure out what percentage of photons emitted from the diode were at 1064 nm, the amount of them that were frequency-doubled or absorbed or scattered or blocked by the filter, as well as the percentage of photons that are transmitted through the filter at specific wavelengths; as a result, the spectrum alone can’t tell us why we aren’t seeing frequency doubling of the 1152 nm Stokes wavelength, though it could simply be that there’s a low probability of any 1152 nm photons being generated and that the KTP and filter may be relatively transparent to them.
Can we, for a minute, talk about how this man looks exactly like TF2's engineer? Yes? Thank you.
i recalled every classmates that would point the lasers at someone and think it was cool (it was a toy laser)
I have a Keychain laser, a powerful pointer pen laser, and a Laser 303. The laser 303 power is between 60 and 200 milliwatts and takes some time to burn a match.
I just bought the same 200X50mm magnet as yours. The size and weight are pretty impressive, but small objects are not strongly attracted by it.
Yeah, the weight of a huge neodymium magnet is surprising. Like solid steel. The attraction on small objects is deceiving. Small objects are quickly magnetically saturated and not much stronger attracted up close than with smaller magnets. But you should note an attraction from a further distance than with smaller magnets. But once something big comes near the magnet, you will realize the real strength of the magnet... Be careful with it :)
@@brainiac75 I wonder. The magnetic field is stronger on the edges than in the center. But it doesn't explain how HUGE the difference of attraction is. So I wonder, the magnetic field in tesla refers to how tight the magnetic line
s are while the attraction of the object is due to how misaligned the lines are, right?
For example the magnetic field is very strong in the center, but the lines are parallel to each other, while the field is a bit stronger on the edges but the lines are curved.
I own a 532+-10nm "
It's as close as we can get to a Light Saber.
For most laser Injuries (from Photonics- Algonquin college) algiment of lasers leads to increased risk of a high powered laser hiting your eyes. Also even if your wearing Safety goggles they only protect against indirect hits from a laser. I work at home with 100-150 mW lasers (Red, Blue, Green and violet) and I always wear safety glasses Lasers are no Joke a Instant blindness with one mistake.
Since you asked... :)
405nm: I got a similarly powered diode laser.
445nm: 6W+ NUBM44(v2) and 2W+ NDB7875
488nm: 80 mW build. Same diode as yours (sharp) driven at slightly higher current.
520nm: 800 mW+ build (NDG7475, driven at a low current)
532nm: CNI lab laser (1.4W)
660nm: red laser diode build from old dvd burner diode (200 mW)
I also have an Ar-ion (6 lines: 458, 476, 488, 496, 502, 515, max total power ~140 mW)
2 HeNe (a 632.8 and my favorite, a 594.1)
1 40W CO2 (10.6um)
A similarly powered 808nm pen
LPM (ophir head) and spectrometer (recently acquired ocean optics HR4000)
So, seems like I need a 980nm and a powerful red laser next...
Wow! I knew some of my subscribers would have amazing collections. You are certainly one of them :D I am especially envy about the Ar-ion laser - amazing technology.
@@brainiac75 Oh yeah, I love the output of the Ar-ion. The mix of all the lines is also an especially interesting cyan. The physics and electronics involved is incredible. It's just that I can't help but view the Ar-ion basically as a space heater with a bonus of some small amounts of laser light, ahaha.