1. 激光
A laser is a narrow beam of concentrated light produced by a special machine. It is used for cutting very hard materials, and in many technical fields such as surgery and telecommunications.

2. 激光器
A laser is a machine that produces a laser beam.

1. an acronym for light amplification by stimulated emission of radiation
an optical device that produces an intense monochromatic beam of coherent light

Synonym: optical maser