Semiconductor Lasers

Semiconductor lasers, also known as laser diodes, are lasers that use semiconductor materials as working materials. Due to the difference of material structure, the specific process of laser generation is special. Commonly used substances include gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), etc. There are three modes of excitation: electrical injection, electron beam excitation and optical pump. Semiconductor laser devices can be divided into homojunction, single heterojunction, double heterojunction and so on. The homojunction laser and single heterojunction laser are mostly pulse devices at room temperature while the double heterojunction laser can work continuously at room temperature.