正交解调Pound-Drever-Hall激光稳频系统设计

发布时间：2018-01-15 11:39

本文关键词：正交解调Pound-Drever-Hall激光稳频系统设计　出处：《中国激光》2016年03期 　论文类型：期刊论文

【摘要】：分析了传统Pound-Drever-Hall(PDH)激光稳频方法的工作原理,设计了一种基于正交解调原理的PDH激光稳频方案。该方案采用直接数字频率合成器同时产生两路频率均为10 MHz的正弦和余弦信号,其中正弦信号分为两路:一路用于驱动电光相位调制器以产生相位边带,另一路与余弦信号一起作为相位解调的参考信号。经相位调制后的激光束耦合进入F-P参考腔,所产生的光外差干涉信号由光电探测器进行探测,其输出信号分别与两路正交参考信号进行混频,经低通滤波后得到误差信号的两个正交分量,二者经A/D转换后进入微处理器进行正交相敏检波运算,即可得到PDH稳频系统的误差信号。建立了正交解调PDH激光鉴频实验系统,对F-P参考腔的腔长进行线性扫描,观察到了鉴频曲线,其鉴频灵敏度为1.82 V/MHz,最大频率变化量为5.48 MHz。实验结果表明,所设计的正交解调PDH稳频方案可行。
[Abstract]:The analysis of the traditional Pound-Drever-Hall (PDH) working principle of laser frequency stabilization method, the design of a PDH laser frequency stabilization scheme based on quadrature demodulation principle. The scheme adopts direct digital frequency synthesizer and two frequency was 10 MHz sine and cosine signal, the sinusoidal signal is divided into two parts: one is used to produce sideband phase driven electro-optic phase modulator, another way with cosine signal as the reference signal with the phase demodulation. Enter the F-P reference cavity through the laser beam coupling of phase modulation, optical heterodyne signals generated by the photoelectric detector for detection of the output signal and the reference signal respectively by mixing the two orthogonal, two quadrature error signal obtained by low-pass filter, two converted by the A/D microprocessor to orthogonal phase sensitive detection algorithm, PDH can get the frequency stabilizing system of the error signal. A quadrature demodulation PDH laser discriminator experiment system is set up. The length of the reference cavity of the F-P is scanned linearly, and the discriminating frequency curve is observed. The discriminating frequency is 1.82 V/MHz, and the maximum frequency change is 5.48 MHz.. The experimental results show that the orthogonal demodulation PDH frequency stabilization scheme is feasible.

【作者单位】：西安理工大学机械与精密仪器工程学院精密仪器系;西安石油大学光电油气测井与检测教育部重点实验室;
【基金】：国家自然科学基金(51175421,61205135)
【分类号】：TN24
【正文快照】： 1引言窄线宽稳频激光器是光原子钟、高分辨激光光谱测量和光外差干涉测量等系统的重要光源。Pound-Drever-Hall(PDH)稳频方法以其伺服响应快、噪声低、不易失锁等优点,成为目前窄线宽稳频激光器常用的一种稳频方法,并被认为是提高窄线宽激光器性能的基本方法之一[1-8]。在传统

【相似文献】