Injection locking method for Raman beams in atom interferometer

Fei Zi; Jianing Deng; Daji Zeng; Tong Li; Mingli Sun; Xian Zhang; Kaikai Huang; Xuanhui Lu

doi:10.1117/12.2299449

5 March 2018 Injection locking method for Raman beams in atom interferometer

Fei Zi, Jianing Deng, Daji Zeng, Tong Li, Mingli Sun, Xian Zhang, Kaikai Huang, Xuanhui Lu

Proceedings Volume 10714, Third International Conference on Photonics Solutions (ICPS2017); 1071406 (2018) https://doi.org/10.1117/12.2299449
Event: Third International Conference on Photonic Solutions, 2017, Pattaya, Thailand

Abstract

We present a novel method to generate two phase-locked beams with a frequency offset of 6.834 GHz. The output of the master laser is firstly modulated by an electric optical modulator (EOM), and then further injected into an Extended Cavity Diode Lasers (ECDL) which is used to filter out the unwanted mode and amplify the laser power. By locking to the first-order lower sideband of the modulated master laser, the average variance of the phase fluctuations is 5.6 x 10^-3 rad² , which implies phase coherence of 99.44% between the master laser and the slave ECDL. The line width of the beat notes is less than 1Hz. For the long term stability, with the delicate design of the electronic controller in ECDL, the phase coherence of the two laser beams can be stabilized over 200 hours without any adjustment. The Raman system is applicable for gravity detection with a preliminary sensitivity Δg/g of 4.5 x 10^-7 for interrogation time of 1500 s.

Citation Download Citation

Fei Zi, Jianing Deng, Daji Zeng, Tong Li, Mingli Sun, Xian Zhang, Kaikai Huang, and Xuanhui Lu "Injection locking method for Raman beams in atom interferometer", Proc. SPIE 10714, Third International Conference on Photonics Solutions (ICPS2017), 1071406 (5 March 2018); https://doi.org/10.1117/12.2299449

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