Design of laser frequency stabilization systems based on FPGA and Pound-Drever-Hall technique
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摘要: 为了实现中心波长为1064nm的单频光纤激光器的稳频，采用相位调制光外差（PDH）激光稳频技术，搭建稳频系统光路。分析了相位调制光外差稳频信号以及误差信号特征；设计基于现场可编程门阵列（FPGA）的数字式解调和反馈控制电路，在FPGA中实现对相位调制光外差稳频信号的数字解调，再经数模转换器输出获得误差信号。结果表明，在FPGA中能成功实现对相位调制光外差信号的解调，经Allan方差计算，频率漂移的方差值可达10-11，即所设计的数字系统实现了较高的稳频精度。
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关键词:
- 激光器 /
- 稳频 /
- Pound-Drever-Hall技术 /
- 现场可编程门阵列 /
- 数字解调
Abstract: In order to stabilize the output frequency of 1064nm single frequency fiber laser, the Pound-Drever-Hall(PDH) locking technique was applied for laser frequency stabilization. The PDH optical heterodyne frequency stabilization system was established. The phase modulation optical heterodyne signal and the demodulation error signal were analyzed. Field-programmable gate array(FPGA) based digital PDH demodulation and feedback control system was designed. A sine wave generator and the multiplication demodulation were implemented in FPGA. Then the error signals were obtained by digital/analog convector. Experimental results show that phase modulation optical heterodyne signal is demodulated successfully in FPGA, and the Allan variance of frequency drifts can reach 10-11, a high level of frequency stabilization. -
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