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This laser is 200 times too powerful to be considered "mostly safe" for human ayes (cat 3R) and 1000 times too powerful to be considered safe (cat 2).

I toyed with the idea but it's hazardous in any usable setup.

If you'd like to do it moderately safe I'd stay away from lasers. Use a power LED and parabolic reflector to make the beam as incoherent as possible and then focus it with optics to create very narrow focal depth. Then it will still be able to burn the mosquito but won't be a blinding hazard as little as 20 centimetres from the focal point.

I must admit I was just thinking out loud, not bothered by any relevant knowledge.

Thank you for your thoughtful explanation.

In Australia a laser that emits more than one milliwatt is a prohibited weapon. Your three 333 mW lasers are still vastly over this legal limit.

(And Australia’s laws here were decided based on safety standards, the figures of which uuidgen points out.)

A 300mW beam is far more than enough to ruin your eyes.