Thank you for the video. In your first comment you ask if you should delete the video. Please don't. The video teaches what can be done in a simple way to create an interferometer. It was very educational for me. Thank you.
Niikola, Thanks for your compliment, I'm a semi-retired optician. I worked in optics for 26 years at US Precision Lens and have been an avid telescope maker for even longer. Ed
Dear Mr. Jones, might I ask you what's your profession. You do improvisation with optical components so smoothly and efficiently that it resembles pure art.
Some have asked about the effect of cementing coated surfaces. It will cause somewhere between 1 to 4 percent reflectivity, not really much to cause a problem.
Notes on the Bath On CN there has been an interesting thread on the Bath www.cloudynights.com/topic/578373-the-bath-interferometer-starting-at-the-bottom/ Evidently a bi- convex lens is better to use than a plano-convex lens because of spherical aberration. I did a layout on Zemax and found that on a 16 inch F/5 mirror and an 8 mm focal length PCX lens you would get .3 waves of error and .129 waves with a BCX lens. Both are more than in the thread above and frankly not very good even for a BCX. So I would recommend not using a PCX lens and even for mirror as fast as F/5 you should ray trace the interferometer and subtract the Zernikes of the error, perhaps not so easy for ATMs. I'm considering deleting this video, what do you think?
Thanks I've had a time finding Beam Splitting Cubes. Could you recommend a source for the different types of interferometers maybe with schematics/Ray Diagrams. Thanks.
@@edjonessongs5308 Will do. Thought it might have to be the high end stuff. I'll use the Pangolin/Horseshoe Bat extract stuff. What could possibly go wrong ?
Here is a beamsplitter from Surplus Shed that's suitable for a Bath like I made: www.surplusshed.com/pages/item/l10563d.html They also sell lenses and mirrors as well you can use in the Bath.Ed
Sorry but this is not a good implemtation of the Bath interferometer. To be accurate it needs a biconvex lens and the lens should not be glued to the cube. A PCX lens such as this will add spherical aberration to the results for fast mirrors. A BCX lens will solve that problem. In addition there is a need to rotate the cube about 1 deg compared to the lens to get reflections away from the interferogram. That can not be done if the lens is glued to the cube. For better details on how to build and use a Bath see groups.io/g/Interferometry/topics or other youtube videos. Dale Eason (the make of the interferometry software OpenFringe and DFTFringe used to analyze the igrams.)
Dale yes the plano-convex lens will add SA on fast mirrors but no you can rotate the cube with the lens cemented since it has no center. You must have missed my next video on the Bath where I recommended using a air-spaced plano-convex lens (facing the other way) that will have the least SA based on Zemax ray tracing, better than a biconvex lens.
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Yes please dont delete, this is an important video for our budding future!
Thank you for the video. In your first comment you ask if you should delete the video. Please don't. The video teaches what can be done in a simple way to create an interferometer. It was very educational for me. Thank you.
Niikola, Thanks for your compliment, I'm a semi-retired optician. I worked in optics for 26 years at US Precision Lens and have been an avid telescope maker for even longer.
Ed
Dear Mr. Jones, might I ask you what's your profession. You do improvisation with optical components so smoothly and efficiently that it resembles pure art.
I'm an optician, still get called in for contract work.
When will we see your interferometer in action?
Your web site needs some love as well my friend!
Some have asked about the effect of cementing coated surfaces. It will cause somewhere between 1 to 4 percent reflectivity, not really much to cause a problem.
Notes on the Bath
On CN there has been an interesting thread on the Bath www.cloudynights.com/topic/578373-the-bath-interferometer-starting-at-the-bottom/
Evidently a bi- convex lens is better to use than a plano-convex lens because of spherical aberration. I did a layout on Zemax and found that on a 16 inch F/5 mirror and an 8 mm focal length PCX lens you would get .3 waves of error and .129 waves with a BCX lens. Both are more than in the thread above and frankly not very good even for a BCX. So I would recommend not using a PCX lens and even for mirror as fast as F/5 you should ray trace the interferometer and subtract the Zernikes of the error, perhaps not so easy for ATMs. I'm considering deleting this video, what do you think?
Thanks I've had a time finding Beam Splitting Cubes. Could you recommend a source for the different types of interferometers maybe with schematics/Ray Diagrams. Thanks.
Any alternatives to Loctite 349 ? That stuff is crazy expensive as in $60 USD online.
Loctite 349 was just what I had on hand. Look for UV glue on Ebay. Glue used for Iphone screen replacement is inexpensive.
@@edjonessongs5308 Will do. Thought it might have to be the high end stuff. I'll use the Pangolin/Horseshoe Bat extract stuff. What could possibly go wrong ?
Oops...I should have said your most recent comment, not your first comment.
Here is a beamsplitter from Surplus Shed that's suitable for a Bath like I made: www.surplusshed.com/pages/item/l10563d.html They also sell lenses and mirrors as well you can use in the Bath.Ed
Sorry but this is not a good implemtation of the Bath interferometer. To be accurate it needs a biconvex lens and the lens should not be glued to the cube. A PCX lens such as this will add spherical aberration to the results for fast mirrors. A BCX lens will solve that problem. In addition there is a need to rotate the cube about 1 deg compared to the lens to get reflections away from the interferogram. That can not be done if the lens is glued to the cube. For better details on how to build and use a Bath see groups.io/g/Interferometry/topics or other youtube videos.
Dale Eason (the make of the interferometry software OpenFringe and DFTFringe used to analyze the igrams.)
Dale yes the plano-convex lens will add SA on fast mirrors but no you can rotate the cube with the lens cemented since it has no center. You must have missed my next video on the Bath where I recommended using a air-spaced plano-convex lens (facing the other way) that will have the least SA based on Zemax ray tracing, better than a biconvex lens.