J4 ›› 2016, Vol. 33 ›› Issue (6): 689-696.

• Laser Tech. and Devices • Previous Articles     Next Articles

Phase-frequency double-modulation frequency stabilization of Raman laser in atom interferometer

LI Dawei1,2,3, CHEN Xi1,2, ZHONG Jiaqi1,2, SONG Hongwei1,4, WANG Yuping1,2,3, ZHU Lei1,2,3, WANG Jin1,2, ZHAN Mingsheng1,2   

  1. 1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences , Wuhan 430071,China; 2Center for Cold Atom Physics, Chinese Academy of Sciences, Wuhan 430071,China; 3 University of Chinese Academy of Sciences, Beijing 100049,China; 4School of Optical and Electronic Information, Huazhong University of Science and Technology,Wuhan 430074,China
  • Received:2015-04-30 Revised:2015-05-26 Published:2016-11-28 Online:2016-11-28

Abstract: In order to reduce the frequency noise of Raman laser, a phase-frequency double-modulation frequency stabilization technique is proposed. The laser is modulated by a fiber electro-optical phase modulator (F-EOM)and large-detuned sidebands are produced. RF signal is used for the frequency modulation of the microwave driving signal of F-EOM, and one of the large-detuned sidebands is locked to a saturation absorption spectral line of rubidium atoms by lock-in amplification. The frequency stabilization and 2 GHz frequency shift of Raman seed laser are realized by using this technique, and the linewidth of Raman laser is narrowed down to 56 kHz. The single measurement noise of the atom interferometer induced by Raman laser frequency noise is expected to be reduced to 7×10-9/s2/shot.

Key words: laser techniques; laser frequency stabilization; phase-frequency modulation;Raman laser

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