Old 05-12-2012, 08:24 PM #1
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Default Very srange beam pattern on a 405nm

uh, not so sure about this. My parents picked lazerer's <500mW 405nm devil cyber series laser (for my birthday), it lases and doesn't feel like it's built poorly for once, however the beam on it is odd, it resembles the beam of my argon. It's kinda like circles inside circles inside circles, with the center being very dim.





any explanations?
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Very srange beam pattern on a 405nm-p5120598.jpg   Very srange beam pattern on a 405nm-p5120599.jpg  


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Old 05-12-2012, 09:31 PM #2
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Default Re: Very srange beam pattern on a 405nm

Looks normal to me. That dim middle is just a dust spot
The circles inside the circles are called the airy disc,Airy disk - Wikipedia, the free encyclopedia
Don't worry about it. You might clean the lens.
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Old 05-13-2012, 01:51 AM #3
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Default Re: Very srange beam pattern on a 405nm

It says the "airy disk" requires a circular aperture to cause interference in the image. The light from a pointer doesn't hit the aperture. There would not be that many rings for a diffraction pattern either.

I think it's spherical aberration.
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Old 05-13-2012, 02:47 AM #4
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Default Re: Very srange beam pattern on a 405nm

spherical abberation looks like that is the problem. I wonder if I could fit a G1/G2 in this thing...
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Old 05-13-2012, 08:27 AM #5
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Default Re: Very srange beam pattern on a 405nm

This also looks more like spherical ab rather than what I initially thought was TEM30.
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