HIMNL9
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^ for this i said "beam expander" ..... probably is large just cause it include some beam expander and alignment screws ..... and probably the beam expander part worth more than all the rest of the laser (12000$ my a**, anyway )
Or maybe is just a long He-Ne tube, they already have a low divergence themselves, and more they are long, less is the divergence ..... :thinking:
Or maybe is just a long He-Ne tube, they already have a low divergence themselves, and more they are long, less is the divergence ..... :thinking: