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FrozenGate by Avery

DIY 488nm Blue laser

Two words: power density.

In addition to everything else that's been raised already (optics, collimation, beamwidth).

There's a reason why the Novalux Protera uses a VESCEL diode with the doubler crystal within the resonator.

Understand exactly why, and you're good to go. And by 'understand', I mean 'why it can't just be done using commercial and/or off-the-shelf components'.
 










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