激光技术
激光技術
격광기술
LASER TECHNOLOGY
2014年
5期
665-668
,共4页
激光器%稳频%Pound-Drever-Hall技术%现场可编程门阵列%数字解调
激光器%穩頻%Pound-Drever-Hall技術%現場可編程門陣列%數字解調
격광기%은빈%Pound-Drever-Hall기술%현장가편정문진렬%수자해조
lasers%frequency stabilization%Pound-Drever-Hall technique%field-programmable gate array%digital demodulation
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。
為瞭實現中心波長為1064nm的單頻光纖激光器的穩頻，採用相位調製光外差（ PDH）激光穩頻技術，搭建穩頻繫統光路。分析瞭相位調製光外差穩頻信號以及誤差信號特徵；設計基于現場可編程門陣列（ FPGA）的數字式解調和反饋控製電路，在FPGA中實現對相位調製光外差穩頻信號的數字解調，再經數模轉換器輸齣穫得誤差信號。結果錶明，在FPGA中能成功實現對相位調製光外差信號的解調，經Allan方差計算，頻率漂移的方差值可達10-11，即所設計的數字繫統實現瞭較高的穩頻精度。
위료실현중심파장위1064nm적단빈광섬격광기적은빈，채용상위조제광외차（ PDH）격광은빈기술，탑건은빈계통광로。분석료상위조제광외차은빈신호이급오차신호특정；설계기우현장가편정문진렬（ FPGA）적수자식해조화반궤공제전로，재FPGA중실현대상위조제광외차은빈신호적수자해조，재경수모전환기수출획득오차신호。결과표명，재FPGA중능성공실현대상위조제광외차신호적해조，경Allan방차계산，빈솔표이적방차치가체10-11，즉소설계적수자계통실현료교고적은빈정도。
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 .
