基于电光调制器实现激光频率锁定

Laser Frequency Locking Based on Electro-optic Modulator

稳频激光在引力波探测、传感检测、原子/分子光谱、量子保密通信等领域有重要的应用价值。将激光器锁定到光学参考频率可以改善激光的频率稳定性,但是当激光器与参考频率的频率失谐较大时,则不能锁定激光频率。因此,本文提出基于电光调制器通过相位调制激光产生边带信号,利用单光子调制技术实时锁定边带信号到光纤布拉格光栅,锁定后在100s内激光频率起伏小于3.3MHz。

Frequency stabilized laser is of great value in application to gravitational wave detection, sensing detection, atom/ molecule spectroscopy, quantum secure communication and so on. The laser frequency stability is improved by stabilizing the laser to the optical frequency reference. However, the laser could not be locked for the large frequency detuning between the laser source and the frequency reference. Therefore, this paper propose to generate the sideband signal by phase modulating the laser based on the electro-optic modulator. The sideband signal is frequency stabilized to the fiber Bragg grating in real time by use of single photons modulation technology. The frequency fluctuation of the stabilized laser is bounded within 3.3 MHz over 100 s.