What kind of light is used in lasers?
‘… The word laser originated as an acronym for light amplification by stimulated emission of radiation. The word light in this phrase is used in the broader sense, referring to electromagnetic radiation of any frequency, not just that in the visible spectrum. Hence there are infrared lasers, ultraviolet lasers, X-ray lasers, etc. Because the microwave equivalent of the laser, the maser, was developed first, devices that emit microwave and radio frequencies are usually called masers. In early literature, particularly from researchers at Bell Telephone Laboratories, the laser was often called the optical maser. This usage has since become uncommon, and as of 1998 even Bell Labs uses the term laser. …(Wikipedia)’ Thus, a laser may generate ‘light’ or electromagnetic radiation the the range b – X-rays c – visible light d – microwaves e – radio waves. However, gamma ray photons are emitted by radioactive nuclei and not lasing devices! I hope this is of some help!
