A Single-laser System for Mobile Cold Atom Gravimeter

Abstract

Improving the environmental adaptability of laser system is the key to realize field measurement for cold atom interference gravimeter. In this paper, a laser system based on a 1560nm fiber laser is described in detail. The output power of trapping laser and Raman laser are 1.1W and 1.9W at 780.2nm, with near-ideal Gaussian mode of TEM00, respectively. Using this compact optical scheme, we achieved the atom gravimeter interference with 2T=140ms, corresponding to an acceleration sensitivity of 610μGal/√Hz, which is limited by vibration conditions. The results of optical frequency locking and power stabilization for laser system meet requirements of high precision mobile gravimeter.