On 11/19/2013 09:39 AM, Boman33 wrote:
Doesn't matter.Note, my example had nothing to do with obtaining a small spot for developing artwork or PCBs. It is a common method for obtaining a \u201cclean\u201d laser beam focused on infinity. It was used for optical experiments. A beam expander will not remove any secondary laser beams, they too will be expanded.
A beam expander plus an aperture presumably will be the same as just an aperture of a smaller size directly in the beam. For example, if the laser beam is 1 x 3mm, a 1mm aperture would give a 1mm beam. Would that not be identical to a 10X beam expander with a 10mm aperture?
Bertho
If beam is 1x3mm and I need 1x1mm with this method I lost 2/3 of power. It's only masking unwanted portition. And expanding and companding losse some power too. I just wonder if I can remove that with lens (colimator) tilted. Or some additional lens tilted... ...need to try, but for now I'm focused ti try the LED aproach