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Heya, At university, I've spent the last semester learning how to use the mills/lathes in the machine shop for the Mechanical Engineering program. Apparently, I have pretty much free access to the shop for whatever personal project I want, and what better than making my own 445nm >1w laser...

Just wondering if these exist. Never seen any, anywhere.

Ahoy. I've been wondering something a while: is there a theoretical lower limit to beam divergence? Would it be possible, given ideal manufacturing and assembly, to make a laser with zero beam divergence? It wouldn't surprise me if lasers were diffraction-limited systems. In fact, that would...

Heya. I recently bought a pointer advertised as 50mW from LEDshoppe. My excitement was enormous-- I was mainly planning to use this for sky pointing, and was expecting a highly visible beam not only at night but at dusk as well as indoors in moderate lighting. However, I am pretty dissapointed...