Semiconductor lasers laser diodes are as Crystal lasers with semiconductor materials. Due to the differences in the structure of matter, different kinds of laser process is rather special. Commonly used work material gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS). Incentives include electrolysis, electron beam excitation and optical pumping in three forms. Semiconductor Laser device, can be divided into the same knot, single heterojunction double heterojunctions, and so on. Homojunction laser and single-heterojunction lasers at room temperature for pulsed devices, and the double heterostructure lasers at room temperature enables continuous work.
Semiconductor diode laser is the most practical and most important lasers. Its small size, long life, and simple current mode can be used to pump its working voltage and current is compatible with ICS, thus with the monolithic integration. And you can also use direct current modulation up to GHz frequency to get the high-speed modulation of the laser output. Due to these advantages, the semiconductor diode laser in optical communications, optical storage, optical gyroscopes, laser printing, ranging and radar, as well as access to a wide range of applications.