由于分布反馈式(DFB)激光器的工作温度会影响其激射波长, 降低无自旋交换弛豫(SERF)原子磁力仪的磁场测量灵敏度, 以TMS320LF2812为核心控制器, 采用数字比例-积分-微分(PID)控制技术, 设计并研制了一种高精度、高稳定性DFB激光器温度控制系统。在硬件电路设计方面, 由温度控制前向通路和温度采集后向通路组成, 构成完整的闭环温度控制结构。软件设计中, 采用Ziegler-Nichols工程整定方法, 实现对P、I 和D三个参数的整定。以中心波长为852 nm 的DFB激光器为被控对象, 利用该温度控制系统对其进行了温度控制实验。实验结果表明: 系统的有效控温范围为5～60 ℃, 控温精度为±0.02 ℃, 稳定时间为20 s。并且在长时间(220 min)测试中, DFB激光器工作温度稳定性优于7.9×10-4(RMS), 为其在SERF原子磁力仪的实用化方面提供了性能保障。

As the working temperature can affect emitting wavelength of distributed feedback(DFB) laser and reduce measurement sensitivity of magnetic field of Spin-Exchange-Relaxation-Free(SERF) atomic magnetometer, a DFB lasers′ temperature controller with high-precision and high stability was designed and developed by using digital proportional-integral-differential(PID) control technology, which is based on TMS320LF2812 core controller. In terms of hardware design, the temperature controller consists of temperature control forward pathway and temperature acquisition backward pathway to form a complete closed-loop temperature control structure. In consideration of software design, the three parameters P, I and D are determined by using Ziegler-Nichols engineering setting method. Using the aforementioned temperature controller, a temperature controlling test was performed on a DFB laser with a center wavelength at 852 nm. Experimental results indicate that, the control scale is 5-60 ℃, the accuracy is ±0.02 ℃, and the control procedure is 20 s. Meanwhile, the stability of working temperature is better than 7.9×10-4(RMS) during long term(220 min) running, which provides performance guarantee for SERF atomic magnetometer in practical application.