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Thank you! And I'm using this for a small build, not for a pet. Reds seem to be built much smaller than the rest, and much cheaper to acquire, so I was just wondering how much power I'd need :D

Adjusted 30mw 650nm Red Laser Diode Dot Line Cross Module w/ Driver In 3-5V | eBay - Was thinking something along these lines. Button cells are preferred; and I'd like the power high enough to be able to see the beam, but not powerful enough to burn anything.

For a standard 650 nm red laser, what's the general rule for power necessary to produce a visible beam? I'm not talking a lightsaber, just something that will distinguish it from a dog toy. I'm very skeptical of buying 30mW for a build and being able to see the difference.

I'm planning a build that requires a host that is no more than 1.5" long and .5" wide; if necessary, some parts could hang out of the host. Does anyone know where I could find, or how I could build, such a laser? I'd prefer it if the beam were visible, but if that's not possible, I'll be alright.

That would be it! Yeah, the diodes are a bit of a mystery. Thanks for the help! :D

What's the best way to figure out the duty cycle of a laser? I'm not sure exactly where I should hold the laser to feel for heat, or how much heat to feel for.

I'll be sure to keep that in mind! Thanks :D

Definitely! I'll probably get a flight tracking app in addition to paying close attention to the sky.

That clears up quite a bit, thank you! :D

My first class 4 laser is on the way, and I want to be completely sure that I'm not doing significant damage to my eye because of a silly misconception, because that's something that I would do. If I'm not mistaken, using the laser outside to point into the sky or pointing it pretty far away...

I'm intending to buy a 5mW 532nm laser diode to use in pretty small housing(unconventional, not at all like a pointer), but all the ones I've seen for a reasonable price require 3V to function. Should I just buy a laser pointer, dissect it, and use the power supply from it, or is there a better...