In 1917 Albert Einstein theorized a process which demonstrated the possiblity of lasers. In 1960 the Ruby laser was invented by Theodore Maiman. The Ruby Laser is considered to be the first operation Light laser.
In 1954 the maser (microwave amplification by stimulated emission of radiation) was invented by Charles Townes and Arthur Schawlow. This technology is similar, but instead uses a micorwave instead of light. Because of this it is not considered a laser.
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