Improvement On Frequency Stabilization Servo System Of The External Cavity Semiconductor Laser

In this paper, the technology of molecule saturation absorption frequency stabilization of the external cavity laser diodes (ECLD) on 1.5μm which is recently researched is discussed, and it can obtain high ratio of precision. The improved scheme of the servo circuit system of the ECLD's molecule saturation absorption frequency stabilization is investigated in the paper. The peripheral loop servo circuit system is the key of the frequency stabilization control. The original servo system uses a lot of discrete components. Its structure is intricate and the performance is not stable enough. In the paper, each part of the servo system is improved and the some components are reduced. The digital/analog mixing circuit is used here, and single chip microcomputer is adhibited to realize the closed loop control functions. This module can realize the closed loop control functions which are necessary for the frequency stabilization. So, the whole system is not only integrated and minityped, but also can be intelligent controlled, and the stabilization is greatly increased. The frequency stabilization ECLD with high degree of accuracy not only is a suitable photo source for the optical communication, but also it can be used widely in many fields, such as medical treatment, military navigation, laser telemeter, photo-electricity detection, laser transducer and etc.