Yuan Cheng, Ke Zhang, Le-Le Chen, Wen-Jie Xu, Qin Luo,
Min-Kang Zhou, and Zhong-Kun Hub
MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics,
Huazhong University of Science and Technology, Wuhan, Hubei 430074, People’s Republic
of China
(Received 22 February 2017; accepted 6 September 2017; published online 13 September 2017)

We present a laser system with low-phase noise and an output power up to 8.8 W at 780 nm for driving Bragg transitions in a ⁸⁷Rb fountain. An optical phase-locked loop (OPLL) is employed to restrain the phase noise that arises from the spatial separation of the two Bragg beams at low frequencies. The residual phase variance is suppressed by two orders around 400 Hz. A Mach-Zehnder Bragg atom interferometer, based on the four-photon recoil scheme, has been realized using this laser system. This interferometer shows a resolution of 5x10^-9g at an integration time of 1200 s for gravity measurements. © 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

http://dx.doi.org/10.1063/1.5001963