Robust single-sideband-modulated Raman light generation for atom interferometry by FBG-based optical rectangular filtration

Abstract

Low-phase-noise and pure-spectrum Raman light is vital for high-precision atom interferometry by two-photon Raman transition. A preferred and prevalent solution for Raman light generation is electro-optic phase modulation. However, phase modulation inherently brings in double sidebands, resulting in residual sideband effects of multiple laser pairs beside Raman light in atom interferometry. Based on a well-designed rectangular fiber Bragg grating and an electro-optic modulator, optical single-sideband modulation has been realized at 1560 nm with a stable suppression ratio better than -25 dB despite of intense temperature variations. After optical filtration and frequency doubling, a robust phase-coherent Raman light at 780 nm is generated with a stable SNR of better than -19 dB and facilitates measuring the local gravity successfully. This proposed all-fiber single-sideband-modulated Raman light source, characterized as robust, compact and low-priced, is practical and potential for field applications of portable atom interferometry.

arXiv comment12 pages, 7 figures

References in corpus (10)

• Continuous Cold-atom Inertial Sensor with $1{\text{nrad.s}}^{-1}$ Rotation Stability
• Limits to the sensitivity of a low noise compact atomic gravimeter
• Mobile quantum gravity sensor with unprecedented stability
• Quantum Tests of the Einstein Equivalence Principle with the STE-QUEST Space Mission
• Phase shift in an atom interferometer induced by the additional laser lines of a Raman laser generated by modulation
• Dual-wavelength laser source for onboard atom interferometry
• Broadband Optical Serrodyne Frequency Shifting
• Application of optical single-sideband laser in Raman atom interferometry
• Performance of an optical single-sideband laser system for atom interferometry
• A compact micro-wave synthesizer for transportable cold-atom interferometers