Abstract： 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.
WANG Zheng-Ling;YIN Jian-Ping. Average Dissipative and Dipole Forces on a Three-Level Atom in a Laguerre--Gaussian Beam[J]. 中国物理快报, 2005, 22(6): 1386-1389.
WANG Zheng-Ling, YIN Jian-Ping. Average Dissipative and Dipole Forces on a Three-Level Atom in a Laguerre--Gaussian Beam. Chin. Phys. Lett., 2005, 22(6): 1386-1389.
2005, Vol. 22 
