短光纤延时自外差测量单频激光器频率漂移

• 作 者: 段洪成 吴谨 赵志龙 吴曙东
• 机 构: 中国科学院电子学研究所,中国科学院大学,
• 出 处: 中国激光
• 发表日期: 2015年07期
• 关键词: 单频激光器 激光器 频率漂移 光外差探测 光纤 相位解缠 激光频率 测量精度 延时线 拍频

基于光纤延时自外差和相位解缠绕技术,提出了一种采用较短的光纤延时线测量单频激光器输出激光频率漂移的方法。从理论上给出了该测量方法的工作原理并分析了测量精度的影响因素;利用一台频率变化可知的激光器对该方法进行了实验验证,实验结果表明该方法能够准确测量激光频率随时间的实际变化曲线;基于此方法,采用6 m的光纤延时线,对一台1550 nm波长的单频激光器频率漂移特性进行了3 h连续测量,得到该激光器长期频率漂移结果为75 MHz/h,与其频率稳定度出厂指标50 MHz/h基本相符。

Based on the technique of heterodyne delay and phase unwrapping, a method of measuring laser frequency drift of a single frequency laser using a short fiber delay line is proposed. The working principle of the measurement method is given in theory and the influencing factors of the measurement accuracy are analyzed. A laser with varying frequency is used to verify the method. The experimental results show that the method can accurately measure the laser frequency with time Based on this method, a 6 m fiber delay line was used to measure the frequency drift of a single-frequency laser with a wavelength of 1550 nm for 3 h. The long-term frequency drift of the laser was 75 MHz / h. And its frequency stability of the factory index of 50 MHz / h basically consistent.