Development Of Semiconductor Laser Temperature Control System

With the wide application of sensing, detection, communications, and other military and civilian fields of electronic devices or optoelectronic devices, semiconductor laser (LD) prominent development prospects location for its micro-efficient, simple structure and low cost. The internal heat generated in the process of such devices work will seriously affect its performance parameters, caused by the operation of the system is unstable, and seriously affect the life of the device in the system, so the need for a semiconductor laser temperature control.This paper presents a high-precision temperature control system for semiconductor lasers based on micro-controller, and in accordance with the need of laser diode temperature control real-time data acquisition and precision control, the characteristics of the semiconductor lasers were established based on MATLAB software on a computer temperature control module of Simulink’s simulation model. This paper selected the fuzzy-Smith control algorithm, the fuzzy algorithm of adjusting the advantages of short time and small overshoot amount, at the same time also has the good robustness of Smith algorithm, such as small steady-state error and good anti-jamming performance, etc.In this paper the temperature control system of semiconductor laser to, on the basis of module partition is divided into hardware design and software design two parts to illustrate. The hardware design, embedded (ARM) technology is adopted, micro control chip for STM32F103VE system. This paper make design on software, using the Real View MDK compiler and development environment by JLINK downloader to load all the parts of the system application to micro controller, so as to realize the function of each module. This paper for the temperature control system, and the results show that the control precision of the system is0.2℃, stability of about0.01℃, temperature control range of the system is about10℃—40℃. This temperature control system has simple structure, lower cost and meets the requirements of the semiconductor laser temperature control.