高精度半导体激光器温控电路的设计与实现  

Design and implementation of temperature control circuit forhigh precision semiconductor laser

作　　者：马腾 张振国 李明山 庄铭今 柯常军 MA Teng;ZHANG Zhenguo;LI Mingshan;ZHUANG Mingjin;KE Changjun(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;University of Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学,北京100094

出　　处：《激光杂志》2024年第8期19-25,共7页Laser Journal

基　　金：国家自然科学基金(No.61975205)。

摘　　要：半导体激光器对于工作温度有着及其严格的要求,半导体激光器的阈值电流、输出光功率和波长会随着温度的变化而产生剧烈变化。为保证半导体激光器的正常工作,设计了一种以单片机为控制核心的温度控制电路,其中包括由电流源和仪表放大芯片组成的温度采集电路和由功率芯片组成的热电制冷器(TEC)驱动电路。通过比例-积分-微分(PID)算法输出两路不同占空比的脉冲宽度调制信号对TEC驱动电路进行控制,并提出降低脉冲宽度调制信号频率来提高TEC驱动电路输出电压调制精度的方法提升电路控温性能。搭建了基于STM32F103CBT6的半导体激光器温度控制电路,验证实验方法的可行性。实验结果表明,当环境温度在20℃~50℃时,该电路可实现其在设定温度±0.01℃范围内的稳定控制。Semiconductor lasers have very strict requirements for operating temperature,and the threshold current,output optical power and wavelength of semiconductor lasers will change dramatically with the change of temperature.In order to ensure the normal operation of semiconductor laser,a temperature control circuit based on single chip microcomputer is designed,which includes temperature acquisition circuit composed of current source and instrument amplifier chip and thermoelectric cooler(TEC)drive circuit composed of power chip.Two pulse width modulation signals with different duty cycle are output by proportional-integral-differential(PID)algorithm to control TEC drive circuit.A method of reducing the pulse width modulation signal frequency to improve the output voltage modulation accuracy of TEC drive circuit is proposed to improve the circuit temperature control performance.The temperature control circuit of semiconductor laser based on STM32F103CBT6 is built to verify the feasibility of the experimental method.The experimental results show that when the ambient temperature is 20~50℃,the circuit can realize the stable control in the set temperature range of±0.01℃.

关 键 词：温度控制 闭环控制系统 高精度 高稳定性 

分 类 号：TN248.4[电子电信—物理电子学]