V形三能级原子的辐射压力和激光冷却  

The radiation pressure and laser cooling of a V-type three level atom

作　　者：张琴[1] 金康[2] 唐远河[1] 屈光辉[1] 

机构地区：[1]西安理工大学应用物理系,西安710054 [2]西北大学物理系,西安710069

出　　处：《物理学报》2011年第5期223-230,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10874138)资助的课题~~

摘　　要：研究了压缩真空中V形三能级原子在单色行波场中的辐射压力和激光冷却.从系统的哈密顿量出发,利用玻恩-马尔科夫近似,推导出了原子的光学布洛赫方程.利用绝热近似,给出了平均辐射压力的表达式.通过量子回归定理和爱因斯坦关系,给出了系统所达到的平衡温度的表达式.讨论了量子相干强度、平均光子数和拉比频率对原子的自发辐射压力和冷却的最终温度的影响.结果表明低于多普勒极限的温度可以获得.The radiation pressure and laser cooling of a V-type three level atom in coherent fields in a squeezed vacuum are considered.From the Hamiltonian of the atomic system,making use of Born-Markoff approximation,the optical Bloch equations are derived.Using the adiabatic approximation,the expression of the mean dissipative force are acquired.The achievable equilibrium temperature is given by the quantum regression theorem and Einstein relation.The dependence of the spontaneous radiation pressure and ultimate temperature on quantum interference,average photon number and Rabi frequency are analyzed.The result shows that temperatures lower than the Doppler limit can be achieved.

关 键 词：压缩真空 自发辐射 量子干涉 

分 类 号：O431.2[机械工程—光学工程]