Notes: A semiconductor lasersemiconductor laserIn 1962, Robert N. Hall demonstrated the first laser diode device, which was made of gallium arsenide and emitted in the near-infrared band of the spectrum at 850 nm. Later that year, Nick Holonyak, Jr. demonstrated the first semiconductor laser with a visible emission.
› wiki › LaserLaser - Wikipedia (LD) is a device that causes laser oscillation by flowing an electric current to semiconductor. It is used in Laser Printers.