Sun 2 Nov, 2003 01:21 pm
Why are laser beams always red?
laser beam colors
They aren't. But red diode lasers are easier and cheaper to make than other types.
Some other very common laser colors are green & blue. There are also lasers with wavelengths in the infrared, lasers that emit microwaves, and even x-ray lasers.
Many colors are available with gas lasers, and any possible color in the rainbow can be produced with dye lasers (which use a liquid organic dye as the lasing medium).
Right. Helium-neon lasers are red, ruby lasers are pink or red, argon lasers are blue/green, etc.