一种可调谐半导体激光器温控电流源模块的设计
A Design of a Temperature-Controlled Current Source Module for a Tunable Semiconductor Laser

目前，可调谐半导体激光器吸收光谱(TDLAS)技术应用于痕量气体检测，成为一个研究热点，该技术中的半导体激光器温度控制是检测精度的关键环节。本文研究可调谐半导体激光器的温控电流源模块，采用单片机作为逻辑控制电路、D/A芯片作为数模转换电路、运算放大器构建反向放大器电路、霍尔元件搭建反馈电流监测电路，形成了一种闭环反馈控制机制，使输出电流波动在±1%以内。该模块达到了该类型激光器波长调节的稳定的需求，为TDLAS技术应用于外场环境中痕量气体检测奠定了基础。
At present, tunable semiconductor laser absorption spectrum (TDLAS) technology has become a research hotspot in the detection of trace gases. Temperature control of semiconductor laser in this technology is the key link of detection accuracy. In this paper, we study A tunable semiconductor laser temperature control current source module, MCU as the logic control circuit, D/A chip, as D/A conversion circuit, operational amplifier to construct reverse amplifier circuit, hall element to build feedback current monitoring circuit, form A closed-loop feedback control mechanism, make the output current fluctuations within ±1%. The module meets the requirement of stable wavelength regulation of this type of laser and lays a foundation for TDLAS technology to be applied to trace gas detection in the external field environment.