A fiber-integrated and power-regulated single-sideband modualted Raman laser source for atom interferometry

Raman-pulse atom interferometers have become powerful tools for quantum sensing with increasing compactness and transportability, thanks to advancements in matured all-fiber laser sources. However, all-fiber Raman laser sources suffer from polarization degradation, as well as power and power ratio fluctuations caused by fiber links and nonlinear frequency conversion. In this paper, we propose a fiber-integrated single-sideband modulated Raman laser source with simultaneous implementation of polarization optimization, power and power ratio stabilization, to enhance atom interferometer performance. The implemented Raman laser source achieves a polarization extinction ratio exceeding 27 dB, a relative power drift of approximately 0.1%, and power ratio fluctuations of around 0.3% (root mean square value) over several hours. Atom interferometer experiments are conducted to investigate the impacts of power and power ratio of Raman lasers on the noise performance and absolute gravity measurement with a sensitivity of 560 µGal/ \(\sqrt{\textrm{Hz}}\) $\sqrt{\text{Hz}}$ is demonstrated. The proposed single-sideband modulated Raman laser source demonstrates compactness, reproducibility and potential applicability in a wide range of atom interferometers and other quantum sensing scenarios.