Never aim the beam of light from a green laser pointer 300mw at a person\'s face--it can damage the retina of the eyes.You all know that when making a laser device, the most difficult part it\'s focusing without buying a module. So here it is, a complet guide about how to make a focusable laser module with parts you have lying around. This module is not recomended for laser diodes over 300mW, because lens can melt and it\'s not the best heatsink. the goals I wanted to achieve are:the module acts as heatsink and it can focus the laser to a single burning point or a beam.
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