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Optical single-sideband (OSSB) Raman laser system based on atomic filter for atom gravimeters
Optics Letters- received 03/13/2024; accepted 04/18/2024; posted 04/22/2024; Doc. ID 523729
- Abstract: Phase-modulator-generated laser for Raman transition is widely used in atom gravimeters to simplify system and improve robustness. However, the induced additional sidebands (ASBs) lead to systematic errors in gravity measurement. This work presents a novel method to generate optical single-sideband (OSSB) laser for Raman transition through phase modulation based on 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 mrad to 2.2 mrad. Furthermore, this system has already applied on atom gravimeter to achieve primary gravity measurement. It shows that FADOF-based Raman laser system is a new scheme for a compact atom absolute gravimeter.