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摘要:
量子传感的发展需要频率高度稳定的激光器为基础，且实现大失谐激光频率稳定通常是提高其精度和灵敏度的关键。针对大失谐激光稳频问题，提出了一种利用法布里-珀罗（F-P）腔传递激光频率稳定性的方法。以饱和吸收稳频法锁定的激光器频率为参考，基于锁相原理，锁定F-P腔长度。利用F-P腔长度这个稳定的参考点，实现目标激光器的频率的精确锁定。实验将目标激光器波长锁定于767.001 nm，失谐频率为150 GHz，锁定后的频率漂移为1 MHz/h。该方法解决了激光大失谐稳频问题，对工程实践和科学研究有重要意义。
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关键词:
- 半导体激光器 /
- 激光稳频技术 /
- 法布里-珀罗(F-P)腔 /
- 激光器调谐 /
- 调制技术
Abstract:Laser frequency stabilization is a common request in the development of quantum sensors. The frequency of the laser often needs to be locked on the detuning far away from the resonance, which is key to improve the sensitivity and accuracy of quantum sensors. Aimed at far off-resonance laser frequency stabilization, a method of frequency stabilization based on a Fabry-Perot (F-P) cavity to transfer the stability from a previously locked laser is proposed. A laser frequency was stabilized by saturated absorption spectrum method as a reference to lock the length of F-P cavity, and the F-P cavity was locked according to a lock-in principle. The highly stable length of F-P cavity, as a benchmark, helped the target laser wavelength to be locked on 767.001 nm, which is as far as 150 GHz from the resonance. The results show that the laser frequency drift is 1 MHz/h after locked. The method solves the problem of far off-resonance laser frequency stabilization, which is of great significance to engineering practice and scientific research.
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图 3 扫描信号、F-P腔失谐功率谱和误差信号
Figure 3. Scanning signal, detuning power spectrum of F-P cavity and error signal
图 4 目标激光器锁定之后1 h通过F-P腔的光强
Figure 4. Light intensity drift through F-P cavity during 1 h after target laser is locked
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