Excessive levitation for the efficient loading of large-volume optical dipole traps

Wang Xiaoqing¹, Li Yuqing^{1, 2, †}, Feng Guosheng¹, Wu Jizhou¹, Ma Jie^{1, 2}, Xiao Liantuan^{1, 2}, Jia Suotang^{1, 2}

(color online) Experimental setup for the excessively magnetic levitated loading of a large-volume crossed ODT. Two beams with different frequency shifts, which are obtained by the acousto-optical modulator (AOM), are focused on the center of a vacuum chamber to form a crossed ODT. Two pairs of coils in the Anti–Helmholtz and Helmholtz geometries are used to produce the magnetic field gradient and the bias field in the vertical direction.