A device that can emit lasers. In 1954, the first microwave quantum amplifier was built, which obtained a highly coherent microwave beam. In 1958, AL Schawlow and CH Townes extended the microwave quantum amplifier principle to the optical frequency range. In 1960, TH Maiman and others built the first ruby laser. In 1961, A. Jarwin and others built a helium-neon laser. In 1962, RN Hall and others created a gallium arsenide semiconductor laser.
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