Semiconductor laser, also known as laser diode, is a semiconductor material as the working material of the laser.It is generally composed of laser working material, excitation source, concentrator, resonator mirror and power supply.The solid working substance used in this kind of laser is made of mixing metal ions which can produce stimulated emission into crystals. Fiber laser​ is refers to the element with rare earth doped glass fiber as gain medium laser, fiber laser can be developed on the basis of the optical fiber amplifier: within the optical fiber under the action of the pump are high power density, causing the laser work material laser level "population inversion", as appropriate to join the positive feedback loop (a cavity) can form a laser oscillation output.