This 520nm laser seems cool, from JetLaser.
It claim laser have AC plug...
They use NDG7475 laser diode with 1.8-2mrad beam spread angle.
If anyone have it, share your experience :D
https://youtu.be/3XNpba1lxhA
I don't know about CO2 laser. Some question I want to ask...
1. CO2 laser company said nerver reverse polarity, but what happen if I reverse it?
2. If I don't use it long or just start a monent, is cooling really necessary?