The word “laser” is the acronym for “light amplification by stimulated emission of radiation.” Since the invention of the first laser in 1960, lasers have rapidly gained wide application in industry, communications, scientific research, medical, military, and entertainment. The current global laser market is about ten billion dollars. There are several types of lasing mechanisms and lasing materials. The emission type of lasers ranges from an extremely narrow pulse of femtoseconds to continuous wave. The power range is from submilliwatts to megawatts. The wavelength range is from tens of nanometers in the UV to tens of microns in the IR. Among all of these lasers, laser diodes are the most widely used lasers and account for about half of the laser market. Laser diodes and fiber lasers are the two fastest-growing sectors.
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