Cold atom gravimeter for absolute gravity measurement

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• Qiang Lin (Zhejiang University of Technology, Hangzhou, China)
• Tuesday 16 August 2016, 13:00-14:00
• Physics East 217.

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Gravimeters using cold atom and stimulated Raman lasers have been improved a lot in recent years. The field applications of gravimeter such as geophysics and geodesy require not only compact sensor system but also adaptation to variable environment, which are challenges for laser and vacuum system for cold atom. Several groups have investigated the mobility of cold atom gravimeter.

We report a compact and mobile gravimeter using free falling cold 87Rb atom cloud interacting with one vertical Raman beam to measure the local absolute gravity. A compact laser system based on fiber laser amplifier and laser second-harmonic generation is used. At the beginning of this year, our cold atom gravimeter was transported to Beijing for the Asia-Pacific Comparison of Absolute Gravimeters. The successful participating of the international gravity measurement campaign has proven the mobility and robust of our system. The sensitivity of our cold atom gravimeter is comparable with that of traditional mechanical dropping mirror method.

This talk is part of the Cold Atoms series.

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