摘要
针对多普勒测风激光雷达系统的应用需求,研制了一套结构紧凑、操作灵活的Pound-Drever-Hall(PDH)激光稳频系统。直接数字频率合成器(DDS)产生激光器高频相位调制信号,模拟混频器解调激光器的频率漂移信息,高集成度的数字信号处理器(DSP)作为稳频控制系统的心脏,负责整个稳频系统的总线控制、信号处理及比例积分微分(PID)伺服等。实验表明,在2.5h内激光器的相对频率漂移不超过±17kHz,其均方根(RMS)误差为5kHz,绝对频率稳定度优于200kHz。在主动对法布里-珀罗干涉仪(FPI)施加6 Hz固定扰动时,系统能够在30ms内迅速恢复稳定。满足直接探测多普勒测风雷达系统中0.1m/s测风精度的应用需求。
A laser frequency stabilizing system for Doppler lidar wind measurement is developed,which has the advantages of compact structure and flexible operation.The radio frequency modulating signal is generated by the direct digital frequency synthesizer（DDS）,the laser frequency drifts are demodulated by the analog mixer,and the functions of the bus controlling,signal processing and proportional-integral differential（PID） servo controlling are implemented by the high integrate chip of digital signal processor（DSP） as the heart of the frequency stabilizing system.The measured laser frequency drifts are less than ±17 kHz during 2.5 h,and whose root mean square（RMS） error is 5 kHz,and absolute frequency stability is better than 200 kHz.The anti-interference performance is also measured.The system will take 30 ms to get back into stabilization when a regular disturbance with the frequency of 6 Hz is put on the Fabry-Perot interferometer（FPI）.The system can be applied to Doppler lidar wind measurement.
出处
《中国激光》
EI
CAS
CSCD
北大核心
2012年第3期1-5,共5页
Chinese Journal of Lasers
基金
国家自然科学基金(61108028
61178031)资助课题
关键词
激光技术
PDH稳频
法布里-珀罗干涉仪
共振频率
数字信号处理
伺服控制
laser technique
PDH frequency stabilization
Fabry-Perot interferometer
resonant frequency
digital signal process
servo control
作者简介
卞正兰（1984-），女，博士研究生，主要从事光电检测与控制方面的研究。E-mail：zlbian@siom．ac．cn
导师简介：瞿荣辉（1972-），男，研究员，博士生导师，主要从事光电子器件与信息系统技术等方面的研究。E-mail：rhqu@siom．ac．cn
