Raman型原子激光制备过程中光场的压缩特性

研究了Raman型原子激光制备过程中探测光场的压缩特性．这种原子激光是利用钠原子玻色-爱因斯坦凝聚体（BEC）与一束较弱的压缩相干态探测光和一束较强的经典泵浦光Raman跃迁相互作用制备得到的研究结果表明，压缩相干态探测光在原子激光制备过程中呈现周期性压缩，其压缩周期与原子阱中的平均原子数、光场与原子BEC相互作用强度及光场的失谐量等因素有关，压缩深度决定于探测光场的初始压缩因子．

Squeezing properties of light field in the process preparing Raman-type atom laser

The squeezing properties of light field in the process preparing Raman-type atom laser via stimulated Raman transition of the Sodium atom Bose-Einstein condensate（BEC） interacting with two light beams, a weaker squeezed coherent probe light and a stronger classical pump light, are studied. The results show that the squeezed coherent probe light can be periodically squeezed. The squeezing period of the probe light is related to the mean number of atoms in trap, the strength of interaction between squeezed light and BEC atoms, and the detuning of the light, and the squeezing depth is determined by the initial squeezing factor of the probe light.