%A WANG Zheng-Ling, YIN Jian-Ping
%T Average Dissipative and Dipole Forces on a Three-Level Atom in a Laguerre--Gaussian Beam
%0 Journal Article
%D 2005
%J Chin. Phys. Lett.
%R
%P 1386-1389%V 22
%N 6
%U {https://cpl.iphy.ac.cn/CN/abstract/article_35203.shtml}
%8 2005-06-01
%X By means of the optical Bloch equations based on the atomic density matrix elements, the general expressions of the average dissipative force, dipole force and the mechanical torque acting on a Λ-configuration three-level atom in a linearly-polarized Laguerre--Gaussian beam (LGB) with an angular momentum of lh are derived, and the general properties of the average dissipative and dipole force on the three-level atom in the linearly-polarized LGB are analysed. We find a resonant property (with two resonant peaks) of the dissipative force and a non-resonant property (with two pairs of non-resonant peaks) of the dipole force on the three-level atom, which are completely different from those on the two-level atom. Our study also shows that all of general expressions on the three-level atom will be simplified to those on the two-level atom in the approximation of large detuning.