Effects related to the temperature of atoms in an atom interferometry gravimeter based on ultra-cold atoms

作者：Heng Zhang, Xudong Ren, Wenhua Yan, Yuan Cheng, Hang Zhou, Zhi Qiang Gao, Qin Luo, Min-Kang Zhou, Zhong-Kun Hu · 发表于：Optics Express · 年份：2021 · DOI：10.1364/oe.433968 · 被引用次数：16 · 研究领域：Cold Atom Physics and Bose-Einstein Condensates、Advanced Frequency and Time Standards、Atomic and Subatomic Physics Research

The temperature of atoms, coupled to several effects, plays an important role in high precision atom interferometry gravimeters. In this work, we present an ultra-cold 87 Rb atom interferometry gravimeter, in which the atom source is produced by evaporative cooling in an all optical dipole trap to investigate the effects related to atom temperature. A condensate containing 4 × 10 4 atoms can be prepared within 3.2 s through an all-optical dipole trap composed of two reservoirs and a dimple. The fringe contrast of our atom interferometry gravimeter reaches up to 76(4)% due to the advantage of ultra-cold atom source even at a free evolution time of T =80 ms. A resolution of 6 μ Gal (1 μ Gal=1×10 −8 m/s 2 ) after 3000 s integration time with a sampling rate of 0.25 Hz is achieved in this atom gravimeter. The relationship between the fringe contrast and the atom temperature in the atom gravimeter is studied; in addition, the wavefront aberration effect in the atom gravimeter is also investigated by varying the temperature of atoms.