The wonderfully British Dr. C. G. B. Garrett of Bell Laboratories stars in “Principles of the Optical Maser,” a 1963 film about how lasers and masers work. Like most of the “How Stuff Works” films from Bell Labs, the actual meat of his explanation holds up pretty well today, even if the simple animation and beatnik tunes do not.

View Link [techchannel.att.com]