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A general NooB question. Lasers, by definition, generate coherent light. But all the lab builds and kits I see on this site (I might be wrong here) use a lens. What is the purpose of the lens, if the light beam is already tight? Thanks.

This looks like a cool site. My hope is to learn enough to build a cool laser (what an original thought, eh?) What really intrigues me, tho, is how you guys are able to build these things that put out hundreds and hundreds of milliwatts from diodes that seem to be rated much lower. I have much...