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Old 12-18-2014, 03:33 PM #1
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Default Diffraction grating lens position

I have a diffraction grating lens that converts a laser beam into the shape of an open circle as shown below:



I was playing around with it using my red laser pointer and I noticed that even if I moved the lens around it still produced the same shape at the same position. That is wether the diffraction gratings lens was centered or off-centered it always gave the same projected image at the same location. Is that normal or does it happen only for the particular shape of an open circie?

I also noticed that even if I reversed the lens it still worked and produced the same shape, at least visually it looked the same but I don't know if it actually changes a little bit. Are diffraction gratings dual faced?


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Old 12-18-2014, 04:05 PM #2
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Default Re: Diffraction grating lens position

Interesting, don't know but curious too. Where did you get it?
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Old 12-18-2014, 04:33 PM #3
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Default Re: Diffraction grating lens position

Quote:
Originally Posted by Laser Project View Post
Interesting, don't know but curious too. Where did you get it?
I got the diffraction gratings on ebay. Just look for Circle Diffraction Gratings
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Old 12-18-2014, 09:26 PM #4
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Default Re: Diffraction grating lens position

Yes, that is all normal. Diffraction gratings work on an interference principle, and are only slightly affected by incidence angle.
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