History The principle of optical amplification was invented by Gordon Gould on November 13, 1957. He filed US Patent US80453959A on April 6, 1959, titled "Light Amplifiers Employing Collisions to Produce Population Inversions" (subsequently amended as a continuation in part and finally issued as on May 4, 1988). The patent covered “the amplification of light by the stimulated emission of photons from ions, atoms or molecules in gaseous, liquid or solid state.” In total, Gould obtained 48 patents related to the optical amplifier that covered 80% of the lasers on the market at the time of issuance.
history the principle of optical amplification was invented by gordon gould on november 13 1957 he filed us patent us80453959a on april 6 1959 titled "light amplifiers employing collisions to produce population inversions" (subsequently amended as a continuation in part and finally issued as on may 4 1988) the patent covered “the amplification of light by the stimulated emission of photons from ions atoms or molecules in gaseous liquid or solid state” in total gould obtained 48 patents related to the optical amplifier that covered 80% of the lasers on the market at the time of issuance