High-order Bragg spectra of interacting ¹³³Cs atoms (IMAGE)
Caption
a, Experimental setup. A ¹³³Cs BEC is prepared in a cigar-shaped optical trap that consists of two nearly orthogonal 1064-nm laser beams (L1 and L2). A pair of counterpropagating Bragg lasers, which are formed by retro-reflecting the trap laser beam (L1), are used to illuminate the atomic BEC for implementing Bragg spectra. b, Schematic of third-order Bragg diffraction involved with the six-photon process. The atom absorbs three photons from the incident laser beam and simultaneously radiate three photons into the retro-reflected laser beam. c, The dependence of frequency shift obtained by using high-order Bragg spectra on the scattering length. The grey dashed line is obtained by using the Bogoliubov theory, and both the blue and orange solid lines show the predictions based on the Feynman-Tan relation.
Credit
by Yunfei Wang, Huiying Du, Yuqing Li, Feng Mei, Ying Hu, Liantuan Xiao, Jie Ma, and Suotang Jia
Usage Restrictions
Credit must be given to the creator.
License
CC BY