R is for Radiation The R in laser stands for radiation .
Radiation is a word that has a bad reputation.
It is a general term for anything that is radiated, or given off by an object. For lasers, radiation refers to the photons which are being emitted. That's the last letter of laser and that's basically how a laser is made. A mplification by the S timulated E mission of R adiation Learn more about light and photons .