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Chinese Optics Letters

Integrated design of a compact magneto-optical trap for space applications

Qiuzhi Qu, 汪斌, 吕德胜, 赵剑波, 叶美凤, 任伟, Jingfeng Xiang, Liu guo Liang

Published Jan 1, 2015• 0 citations
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In this Letter, we describe an optical assembly that is designed for the engineering application of the atomic laser cooling techniques.Using a folded optical path scheme, we have built a miniaturized, compact magneto-optical trap (CMOT) for an 87 Rb atomic fountain clock.Compared with the conventional magneto-optical traps used in other clocks, our system is more robust, more compact, more stable, and saves about 60% laser power.This optical setup has operated for about a year in our fountain system, passed the thermal cycle tests and the mechanical vibration and shock tests, and maintained a high performance without a need for realignment.
The high-precision gravity measurements of cold atom experiments puts highly demands on the design and qualification of magneto-optical trap. We present a new modular magneto-optical trap for the cooling and manipulation of rubidium atom interferometry based on free space optical bench technology, which has been developed for a portable atomic inertial sensor. The setup consists of an integrated cooling laser injecting module, a free space bench module, an integrated Raman laser injecting module and a reflecting mirror attached to a single tri-axial accelerometer. The traditional magneto-optical trap includes 3 pairs of commercial cooling laser injecting lens, which are hard to assembled together in 3 mutually perpendicular directions and intersected at a common point. This paper introduces a new free space bench method to meet the angle and position requirements of magneto-optical trap. The vertical angle error of each pair of Cooling beams and intersection coincidence distance can be controlled in a small range. And the free space bench module is easy to control the parameters of laser beams, such as power and polarization. Theoretical analysis and experimental results show that the new modular magneto-optical trap is more reliable and robust in comparison with traditional MOT.