Laser technology appeared in the 1960s, and its actual application began in the early 1970s. The earliest laser transmitter was an electronic laser tube filled with helium-neon (He-Ne) gas, which was very large, so it was very limited in practical applications.
In the late 1970s, semiconductor technology tended to mature. Semiconductor lasers were born, and high-sensitivity photosensitive materials were continuously discovered. Coupled with the development of laser control technology, laser technology matured rapidly and entered the field of practical application.
Researchers represented by the United States and Japan have combined laser technology and computer technology on the basis of electrostatic copiers, and have successively developed semiconductor laser printers. This type of printer has good printing quality, fast speed and no noise, so it has been widely used soon.
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