谐振光学陀螺小型化半导体光源温控模块设计

Design of temperature control module of miniaturized semiconductor laser in resonator optical gyroscope

半导体激光器以其窄线宽、驱动电路简单以及易于集成化等优势被广泛应用于谐振式光学陀螺系统中。针对谐振光学陀螺小型化需求,设计了半导体激光器热电制冷器(TEC)温控模块。首先在分析激光器管芯TEC模块传递函数特性的基础上,引入PID反馈模块,设计并确定合适的反馈参数。结果表明补偿后闭环系统相位裕量为76°,增益裕量为44.8 dB,具有较好的直流响应和动态性能,并测得稳定工作时温度波动量小于0.01℃。最后对激光器输出光学性能进行测试,中心频率漂移在10 MHz量级,激光器线宽为3.1 kHz,结合谐振式光学陀螺的典型参数计算得到谐振腔精细度为33,极限灵敏度为0.14°/h。满足高性能谐振式光学陀螺中小型化光源的使用需求。

Semiconductor lasers are widely used in resonator optical gyroscope systems due to the advantages of narrow linewidth,simple driving circuit and easy integration.In order to achieve the miniaturization and integration for the semiconductor lasers,the thermo electric cooler(TEC)temperature control module of semiconductor laser is designed.First,based on the analysis of the transfer function characteristics of the TEC module of the laser die,a PID feedback module is introduced to design the appropriate feedback parameters.The results show that the closed-loop system phase margin after compensation is 76°and has a gain margin of 44.8 dB,indicating that the closed-loop system has good DC response and dynamic performance,and the temperature fluctuation is less than 0.01℃during stable operation.Finally,the optical performance of the laser output is tested.The center frequency drift is on the order of 10 MHz,and the laser linewidth is 3.1 kHz.Combined with the typical parameters of the resonator optical gyroscope,the fineness of the resonant cavity is 33 and the limit sensitivity is 0.14°/h,which can meet the demand of miniaturized semiconductor laser in high performance resonant optical gyro.