The word “laser†is an acronym for “light amplification by stimulated emission of radiation.†The first laser, using a silver-coated ruby cylinder as the resonator, was developed in 1960 at California’s Hughes Research Laboratories.[1] Today, lasers are used for purposes ranging from measurement to reading encoded data, and there are several ways to make a laser, depending on your budget and skills.
https://www.wikihow.com/Make-a-Laser
