Precision Alignment Scheme for Initial Confinement of Cold Atomic Ocean Gravimeter

Cold atomic ocean gravimeters have significant potential in deep-sea/submarine inertial navigation exploration. However, optical initial misalignment and polarization fluctuations would reduce the dynamic detection performance. This paper reported a precise initial alignment scheme for Initial Confinement of cold atomic ocean gravimeter. polarization debug for optical polarization stabilization and CMOS camera fluorescence imaging combined with image processing technology to optimize aspect ratio, fluorescence intensity, offset parameters of atomic clouds to initially align optical path by iteratively rotating tubes and mirror positions, to minimize error propagation starting from the initial magneto-optical trap (MOT) phase. The experimental results show that the precise initial alignment scheme could suppress the alignment angle error within 10.63μrad, the number of atomic clouds reach 108, the temperature is approximately 191μK.