How do laser pointers work?

1 Answer
Oct 6, 2015

Laser pointers generate light in a laser diode and then put the laser beam through one or more mirrors.


Laser light is produced when you bounce light back and forth between two mirrors, in certain special mediums.

Minute Physics: How lasers work

Here is the inside of a typical inexpensive red laser pointer:
Sam Goldwasser,

And here is the inside of an expensive, green laser pointer:
Sam Goldwasser,

In general, you generate the laser light in the Laser Diode (powered by batteries) and then put the light through one or more lenses to make the beam wider.