Noun
an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light
Source: WordNetThe concept originally was called an "optical maser". Source: Internet
Townes later worked with Arthur L. Schawlow to describe the principle of the optical maser, or laser, of which Theodore H. Maiman created the first working model in 1960. Source: Internet
When the coherent optical oscillator was first imagined in 1957, it was originally called the "optical maser." Source: Internet