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A phase-locked laser system based on double direct modulation technique for atom interferometry

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Abstract

We demonstrate a laser system based on phase modulation technology and phase feedback control. The two laser beams with frequency difference of 6.835 GHz are modulated using electro-optic and acousto-optic modulators, respectively. Parasitic frequency components produced by the electro-optic modulator are filtered using a Fabry–Perot Etalon. A straightforward phase feedback system restrains the phase noise induced by environmental perturbations. The phase noise of the laser system stays below −125 rad2/Hz at frequency offset higher than 500 kHz. Overall phase noise of the laser system is evaluated by calculating the contribution of the phase noise to the sensitivity limit of a gravimeter. The results reveal that the sensitivity limited by the phase noise of our laser system is lower than that of a state-of-the-art optical phase-lock loop scheme when a gravimeter operates at short pulse duration, which makes the laser system a promising option for our future application of atom interferometer.

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Acknowledgements

The authors would like to thank Jixun Liu and Yixiang Yu for fruitful discussions and Shifeng Yang for his contribution to the construction of the laser system.

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Authors and Affiliations

  1. Institute of Opto-electronics and Technology, School of Instrumentation Science and Opto-electronics Engineering, Beihang University, Beijing, 100191, China

    Wei Li, Xiong Pan, Ningfang Song, Xiaobin Xu & Xiangxiang Lu

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  1. Wei Li
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  2. Xiong Pan
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  3. Ningfang Song
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  4. Xiaobin Xu
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  5. Xiangxiang Lu
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Correspondence to Xiong Pan.

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Li, W., Pan, X., Song, N. et al. A phase-locked laser system based on double direct modulation technique for atom interferometry. Appl. Phys. B 123, 54 (2017). https://doi.org/10.1007/s00340-016-6630-6

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