The Research On The Controllable Work Mode Of Semiconductor Laser UMXX00

With the rapid development of laser technology and photoelectron component technology, as well as the further requests about the distance and quality of communication, the optical communication technology is rapidly developed with unique merit. As semiconductor laser diode is the lamp-house of the spatial optical communication emission system, that how to guarantee its high-efficiency, steady, and safe working becomes an issue paid attention to currently. Semiconductor laser diode is a kind of device with high power density and sky-high quantum efficiency. Even weak drive current and temperature change will lead to its large change of output light power and device parameter, which directly damages the safe use of laser diode, even steady working of all communication system. At the same time, Semiconductor laser diode is very sensitive to the temperature not only leads to the fluctuation of supply current, but also makes threshold current, quantum efficiency, output wavelength and output light intensity of the laser diode change greatly. So, it is necessary to control the semiconductor laser diode by technology of detecting exactly and controlling automatically in practical application. The high power and high reliable laser is the most important part in the spatial optical communication emission system.The thesis discusses and analyzes to the laser's characteristics and modes. The laser has two kinds of modes. One is controlled mode, the other is uncontrolled mode. The controlled mode is to control current and temperature of laser for laser's stability.