The laser-intensity dependence of the photoassociation spectrum of the ultracold Cs₂(6S_1/2+6P_1/2) 0_u⁺ long-range molecular state

The high-resolution photoassociation spectrum of the ultracold cesium molecular 0_u⁺ state below the 6S_1/2+6P_1/2 limit is presented in this paper. The saturation of the photoassociation scattering probability is observed from the dependence of the trap-loss probability on the photoassociation laser intensity. The corresponding resonant line width is also demonstrated to increase linearly with increasing photoassociation laser intensity. Our experimental data have good consistency with the theoretical saturation model of Bohn and Julienne Bohn J L and Julienne P S 1999 Phys. Rev. A 60 1.