国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

Semiconductor laser with narrow linewidth and high frequency stability has been widely used in interference measurements, optical frequency standard and precision spectroscopy. The daily frequency drift of a free running semiconductor laser can reach GHz level. Therefore, it is very important to study the frequency stabilization of semiconductor laser. In this paper, a mathematical model of laser frequency stabilization control system based on the phase locked loop (PLL) theory is proposed. The principle of lock-lose is been analysed and simulated by employing Matlab/Simulink. The result shows that the internal signal of the control circuit can be applied as the criterion of the lockout. Furthermore, an experimental phase-locking system is built with the integral scanning method to measure the actual locking performance. The good agreement of the results between the experiment and simulation presents that the theoretical model is reliable. Under the condition of precise temperature control, the laser shows excellent long-term frequency stabilities with a instability frequency below 5MHz.