Effective Detuning of a Three-Level Atom Interacted with the Laguerre-Gaussian Laser Beam

摘要

We derive the general analytic expression of the effective detuning of the linearly polarized light field from the Λ -configuration three-level atomic mode. The detuning amending term resulting from the three-level atomic mode is not related with the type of light field, which is determined by the two lower level split and the ratio of the two lower level dipole matrix element to the total dipole matrix element in the three-level atomicmode. For a linearly polarized Laguerre-Gaussian laser beam, we show that there is same frequency amending for the axial, radial and azimuthal frequency detuning. We define an effective two-level atomic mode to substitute the three-level atomic mode, in which it can be more practical and convenient in consideration of the light detuning and Doppler shift from atomic transition frequency.