Digital driving system for acousto-optic modulators in cold atom interferometer

Abstract

Abstract: In order to meet the need of laser frequency shift and precision sweep in cold atom interferometry experiments, a control system for acousto-optic modulator with digital interface is designed and implemented. The control system consists of three components, namely upper computer (PC), microcontroller (ARM) and radio-frequency generator (DDS). Among them, PC is used to collect control information; ARM chip controls the DDS chip according to control information, so that the DDS chip can generate a RF driving signal for acousto-optic modulator, and obtain the desired laser frequency for experiments. The control system can output RF signals with frequency of 0~150 MHz and phase noise as low as -116 dBc/Hz. Meanwhile, the amplitude, phase and frequency sweep rate and other parameters of the output signals can be controlled efficiently. Additionally it offers a variety of operating modes to meet different requirements in cold atom interferometry experiments.

Key words: Laser techniques; Laser frequency shift; Acousto-optic modulation; Drive system

CLC Number:

O562

WANG Xin-ran1,2,3, LI Yi-min1,2,3, TU Juan1,2,3, XIONG Zong-yuan1,2, WANG Jin1,2, ZHAN Ming-sheng1,2. Digital driving system for acousto-optic modulators in cold atom interferometer[J]. J4, 2014, 31(5): 554-562.

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