为了降低软件设计复杂度并提高分布反馈激光器发光波长的控制准确度及稳定性，设计了一种用于气体检测的半导体激光器温度控制系统，它由数字信号处理器、温度设定电路、温度采集电路、模拟比例积分微分电路、半导体制冷器控制电路等模块构成.利用该系统对用于水汽检测、中心波长为1 860 nm的可调谐分布反馈激光器做了驱动实验，结果表明：该系统的有效控温范围为10 ℃~50 ℃，控温准确度为±0.05 ℃，温度稳定时间小于60 s;改变温控系统的驱动电流和设定温度，测得的激光器工作波长呈现出良好的调谐特性;连续4天测得的4条光谱曲线几乎重合，表明该系统具有良好的稳定性.

In order to decrease the design complexity of software and to enhance the control stability and accuracy of distributed feedback laser′s emitting wavelength, a temperature controller for semiconductor laser used in gas detection was developed, which includes digital signal processor, temperature setting circuit, temperature sampling circuit, analog proportionintegrationdifferential circuit, thermal electric colling control circuit, etc. A wavelengthtunable distributed feedback laser centered at 1 860 nm used for humidity detection was driven using the proposed temperature controller. Experimental results indicate that, the control scale on temperature is 10 ℃~50 ℃, the accuracy is ±0.05 ℃, and the temperatureestablished time is less than 60 s; with different driving current and temperature supplied by the system, the operation wavelength of the laser shows good tuning characteristics; the four spectral curves from four days′ measurements almost coincide with each other, demonstrating stable performances of the controller.