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浙江理工大学 机械与自动控制学院,浙江 杭州 310018
Received:14 October 2020,
Revised:07 December 2020,
Published:15 February 2021
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谢建东,严利平,陈本永等.可调谐激光器激光波长宽范围自动偏频锁定[J].光学精密工程,2021,29(02):211-219.
XIE Jian-dong,YAN Li-ping,CHEN Ben-yong,et al.Automatic offset-frequency locking of external cavity diode laser in wide wavelength range[J].Optics and Precision Engineering,2021,29(02):211-219.
谢建东,严利平,陈本永等.可调谐激光器激光波长宽范围自动偏频锁定[J].光学精密工程,2021,29(02):211-219. DOI: 10.37188/OPE.20212902.0211.
XIE Jian-dong,YAN Li-ping,CHEN Ben-yong,et al.Automatic offset-frequency locking of external cavity diode laser in wide wavelength range[J].Optics and Precision Engineering,2021,29(02):211-219. DOI: 10.37188/OPE.20212902.0211.
针对激光多波长干涉绝对测距中构建多级合成波长的需求,提出了一种锁至飞秒光频梳的可调谐激光器(External Cavity Diode Laser, ECDL)输出激光波长的宽范围自动偏频锁定方法。首先,设计了光栅+双凸透镜梳齿滤波的拍频信号探测单元,实现了宽范围ECDL激光波长与目标梳齿的拍频探测。接着,采用锁相放大原理对拍频信号进行鉴频鉴相,具备捕获带宽大、鉴相范围宽和鉴相精度高的优点。然后,利用多重闭环控制实现了ECDL输出激光波长宽范围的自动调节及偏频锁定。实验结果表明,本方法实现了10 nm波长范围内ECDL至光频梳的自动锁定,拍频信号信噪比的平均值约为35.9 dB;在4 h内,ECDL激光频率的标准差为1.49 kHz,1 s平均时间的相对阿伦方差为4.76×10
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,满足精密干涉测量中宽范围波长调节和高精度稳频的要求。
To construct different synthetic wavelengths for multi-wavelength interferometric absolute distance measurements, an automatic offset-frequency locking method was proposed to lock the frequency of a tunable external cavity diode laser (ECDL) to a femtosecond optical frequency comb (OFC) in a wide wavelength range. First, based on the grating and double convex lens comb filtering, a beat signal detection unit was designed. In addition, the beat signal detection between the ECDL and target comb modes in a wide wavelength range was realized. A phase-frequency detector was then designed based on the principle of a lock-in amplifier; phase-locking with a large capture range, wide monotonic phase range, and high accuracy was achieved. Finally, multiple closed-loop controls were adopted to realize automatic adjustment and offset-frequency locking of the ECDL over a wide wavelength range. Experimental results show that the proposed method can automatically lock the ECDL to OFC in the range of 10 nm, and the average signal-to-noise ratio of the beat signal is approximately 35.9 dB. Over 4 h, the standard deviation of the ECDL laser frequency is approximately 1.49 kHz, and the relative Allan deviation is approximately 4.76 × 10
-12
at 1 s. The proposed automatic offset-frequency locking method can satisfy the requirements of wide-range wavelength adjustment and high-precision frequency stabilization in precision interferometry.
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