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Old 03-20-2009, 12:46 PM #1
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Default Is this an example of an Airy Disk?

I discovered that when I burn through a CD case with my 300mW green laser, the following effect is produced on the wall:

Full pic: http://jwcxz.com/projects/lasers/halos.jpg


Video:
http://www.youtube.com/watch?v=Wy3oR6fY6W8

At first, I didn't know what this was caused by, but I found this on Google:
http://frank.mtsu.edu/~phys2020/Lect...apertures.html
http://en.wikipedia.org/wiki/Airy_disk

Is this what I'm seeing? Or am I totally wrong?


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Old 03-20-2009, 07:50 PM #2
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Default Re: Is this an example of an Airy Disk?

Yes. You can compute the wavelength of your laser from the distance of the pattern from the aperture, the diameter of the aperture, and the spacing of the rings. Have fun *

EDIT: "Yes" means "yes you're right"...
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Old 03-20-2009, 09:15 PM #3
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Default Re: Is this an example of an Airy Disk?

Jwc;

It also looks just like the pattern you get with a BluRay,
when you use one of the "objective lenses' from the original sled.

I guessed that it was some type of circular diffraction.

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