Average Dissipative and Dipole Forces on a Three-Level Atom in a Laguerre-Gaussian Beam |
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作者姓名: | 王正岭 印建平 |
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作者单位: | KeyLaboratoryofOpticalandMagneticResonanceSpectroscopy,DepartmentofPhysics,EastChinaNormalUniversity,Shanghai200062 |
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摘 要: | 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 A-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.
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关 键 词: | 平均耗散 偶极力 三级原子 拉规尔-高斯电子束 波尔霍光学函数 |
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