Yi Cong, Zhao Yang, Zhuang Wei, Chen Jingbiao, Shi Tiantian, Qin Xiaomin
Opt Lett. 2024 May 15;49(10):2745-2748. doi: 10.1364/OL.523729.
Phase-modulator-generated laser for Raman transition is widely used in atom gravimeters to simplify a system and improve robustness. However, the induced additional sidebands (ASBs) lead to systematic errors in gravity measurement. This work presents a novel, to our knowledge, method to generate an optical single-sideband (OSSB) laser for Raman transition through phase modulation based on a Faraday anomalous dispersion atomic filter (FADOF). The experimental result indicates that it can reduce the additional sidebands with a signal-to-noise ratio (SNR, the intensity ratio of carrier and unwanted sidebands) of better than 50 dB, and the phase shift caused by ASBs is demonstrated to be effectively suppressed from 358.8 to 2.2 mrad. Furthermore, this system has already been applied on an atom gravimeter to achieve a primary gravity measurement. It shows that the FADOF-based Raman laser system is a new scheme for a compact atom absolute gravimeter.
用于拉曼跃迁的相位调制器产生的激光在原子重力仪中被广泛使用，以简化系统并提高鲁棒性。然而，诱导产生的附加边带（ASB）会导致重力测量中的系统误差。据我们所知，这项工作提出了一种新颖的方法，通过基于法拉第反常色散原子滤波器（FADOF）的相位调制来产生用于拉曼跃迁的光学单边带（OSSB）激光。实验结果表明，它可以将附加边带降低到信噪比（SNR，载波与不需要的边带的强度比）优于50 dB，并且证明由ASB引起的相移从358.8有效抑制到2.2 mrad。此外，该系统已经应用于原子重力仪上以实现基本重力测量。结果表明，基于FADOF的拉曼激光系统是紧凑型原子绝对重力仪的一种新方案。
