The difference between the laser flashlight and the general laser pointer and the stylus is that its shell is similar to the ordinary flashlight, the volume is larger, and the power is usually larger. The visible laser is designed as a portable, hand-held, laser module (diode) processing pen-shaped transmitter. Laser flashlights belong to semiconductor lasers, which are different from...

Unfortunately, a lot of people know a little about lasers but not very specific laser safety information. It is fairly complicated, but the Laser Institute of America and ANZI have tried to simply the situation by being somewhat conservative. For visible lasers, assuming the initial beam size is about a millimeter in diameter, different classes of lasers are defined. By the way, the laser beams...