Old 10-16-2010, 10:32 PM #17
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Default Re: My latest creation, 445nm corrected.

Sorry for the terrible necrobump, however, I may have something to add about the problem with the stray beam.

It may be the result of the tube (tunnel aperture) you use as the clipping aperture.

I was playing around with a 1mW keychain and a bit of tube the other day, and found that reflections from within the tube can get collimated into the beam, especially if the clipping aperture is placed before a lens.

Check for reflections within the aperture or damage to the faces of the prism pair.

The best way to clip a beam is to build a 1:1 beam expander, and have a pinhole aperture at the focal point. Slowly move the pinhole aperture from the focal point until you get the desired result.

Yes, you'll lose a fair bit of power, but it'll probably end up cutting out the stray beam in the process.


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