A Simplified Laser System for Atom Interferometry Based on a Free-Space EOM

Abstract

In this paper, a compact laser system for 87Rb atom interferometry based on only one free-space electro-optic modulator (EOM) was realized, where repumping and Raman beams were generated with a free-space EOM. In addition, this laser system does not require a laser amplifier compared to fibered EOM since fibered EOM cannot transmit high-power lasers. However, due to the narrow modulation linewidth of free-space EOM, it is impossible to obtain the frequencies of repumping and Raman beams separately, which would lead to some complicated effects. Therefore, a theoretical analysis was carried out to solve this problem, and a new frequency scheme for AI is proposed. For the experiment, the laser system of AI was built up. Moreover, the atomic interference fringes were obtained with a contrast of 20.7% (T = 60 ms) and the fitted phase resolution is approximately 1.25 mrad. The presented laser system could provide a new solution for compact AI systems in the future.

The Influence of Temperature on Frequency Modulation Spectroscopy in Atom Gravimeter

“…Since the first quantum sensor based on atom interferometry was developed in 1990s [1][2][3], atom interferometry techniques have been demonstrated to be extremely sensitive and accurate methods. These sensors enable precise measurements in lots of fields, such as the determination of fundamental constants [4][5][6][7][8][9][10][11], measurement of the rotation rate [12][13][14][15][16], gravitational accelerations [17][18][19][20], gravity-field curvature [21], and gravity-field gradient [22][23][24][25][26][27]. At present, the atom gravimeter has demonstrated better performance than its classical counterparts [28][29][30].…”