The gradient force, as a function of position and velocity, is derived for a two-level atom interacting with a standing-wave laser field. Basing on optical Bloch equations, the numerical solutions for the gradient force f_(|_;n) (n = 0, 1, 2, 3, 4, ...) pointing in the direction of the transverse of the laser beam are given. It is shown the higher order gradient force plays important role at strong intensity (G = 64), the contribution of them can not be neglected.
© 2005 Chinese Optics Letters
Jianxing Fang, Xianfeng Chen, Shiqun Zhu, and Rong Zhang, "Resonant gradient force on atom interacting with laser field," Chin. Opt. Lett. 1, 122-124 (2003)