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ArcticMyst Security by Avery

Very srange beam pattern on a 405nm

Joined
Feb 4, 2010
Messages
3,278
Points
113
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.

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any explanations?
 

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Last edited:





Joined
Sep 12, 2007
Messages
9,399
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113
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.
 
Joined
Feb 4, 2010
Messages
3,278
Points
113
spherical abberation looks like that is the problem. I wonder if I could fit a G1/G2 in this thing...
 

TomD

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Joined
Apr 8, 2012
Messages
125
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This also looks more like spherical ab rather than what I initially thought was TEM30.
 




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