The difference between a fiber laser and a semiconductor laser

The difference between a fiber laser and a semiconductor laser is that they emit different media materials. The gain medium used by fiber optic lasers is optical fiber, the gain medium used by semiconductor lasers is semiconductor materials, usually gallium arsenide, indium gallium, etc.(in the same way, a solid laser's gain medium is usually a crystal or glass, ceramic, etc. The gas is used to use helium neon, carbon dioxide, etc.)The luminescence mechanism of semiconductor laser is transition between particles in the conduction band and valence band to produce photons, because it is a semiconductor, so the use of electric excitation, is direct lightning conversion. Optical fiber can not be converted directly by the optical fiber, it needs to be used in the pump gain medium (usually with a laser diode pump), it realizes the optical conversion.
  Fiber optic laser heat is good, general air is cold can. A semiconductor laser is very affected by temperature, and when the power is large, it needs water cooling.
  A semiconductor laser is a laser that USES solid laser materials as a material for work. It is composed of laser working matter, source of excitation, lumen cavity, cavity reflector and power supply. The solid work materials used by such lasers are made of metal ions that have the ability to produce stimulated ejection.