Method of Phase Locking Frequency Stabilization for Diode Lasers by F-P Optical Cavity

doi:10.7652/xjtuxb201610019

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Method of Phase Locking Frequency Stabilization for Diode Lasers by F-P Optical Cavity

更新时间：2025-07-09

- Method of Phase Locking Frequency Stabilization for Diode Lasers by F-P Optical Cavity
- Vol. 50, Issue 10, Pages: 125-131(2016)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201610019
  CLC： TB96
- Online First：10 October 2016，
  
  Published：2016
- 稿件说明：
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Method of Phase Locking Frequency Stabilization for Diode Lasers by F-P Optical Cavity[J]. 2016, 50(10): 125-131.
DOI：

Method of Phase Locking Frequency Stabilization for Diode Lasers by F-P Optical Cavity[J]. 2016, 50(10): 125-131. DOI： 10.7652/xjtuxb201610019.

摘要

针对外腔半导体激光器出射光频不稳定的问题

提出了一种将Fabry-Perot(F-P)光学腔与锁相放大器相结合的稳频方法

将激光器出射光频稳定在F-P光学腔的平均腔长相对应的谐振频率上。信号发生器驱动F-P光学腔的腔长按照正弦规律变化

光电探测器将透过F-P光学腔的光信号转化为电信号

锁相放大器将这一电信号与信号发生器的驱动信号进行混频经低通滤波后得到光学腔谐振信号相位误差。利用这一相位误差信号

通过PID控制器对激光器内腔电流和外腔PZT驱动电压两种不同的反馈方式进行反馈控制

实现稳定的输出光频。理论推导出光学腔谐振信号相位误差与激光器波长变化关系

选用F-P光学腔透射峰值时间间隔τ的标准偏差作为评价频率稳定度指标。通过实验验证

选用外腔PZT驱动电压的反馈方式

能将外腔半导体激光器的光频稳定性提高约80%

该方法具有简单高效的特点

并且可以实现较长时间的频率稳定

也能够适用于不同波长的激光器稳频。

Abstract

Aiming at the issue of the frequency instability of emergent light from diode lasers in Littman configuration

a stabilization method combined F-P cavity with phase-locked amplifier is proposed. The laser frequency is stabilized to the resonance frequency corresponding to the average cavity length of a F-P cavity. A function generator is used to drive the F-P cavity according to the sinusoidal signal

and a photoelectric detector is used to transform optical signals passing through F-P optical cavity into electrical signals. The electrical signals frequency mix with drive signals from function generator and then pass trough low pass filter in the phase-locked amplifier to get optical cavity resonance signal phase error. The signal is given back to laser by PID controller to stable optical frequency through the feedback selection of internal current and external cavity PZT driving voltage. We theoretically deduce the correlation between optical cavity resonance signal phase error and the laser wavelength

and then choose the standard deviation of the F-P optical cavity transmission peak time interval value τ as a frequency stability evaluation index. Experiments show that the stability of external cavity semiconductor laser frequency is improved by 80% via feedback selection of external cavity PZT driving voltage. This method is simple and efficient to be applied to different wavelengths and longtime laser frequency stabilization.

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references

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