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

Heng Zhang, Xudong Ren, Wenhua Yan, Yuan Cheng, Hang Zhou, Zhi Gao*, Qin Luo†, Minkang Zhou, Zhongkun Hu

Abstract：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 ⁸⁷Rb 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 × 10⁴ 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 μGal (1 μGal=1×10⁻⁸ m/s²) 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.

期刊名：Optics Express

期/卷：29

页码：30007

发表时间：1 Sep 2021

DOI：10.1364/OE.433968