两个级联型三能级原子受激辐射的非线性性质

本文研究了两个级联型三能级原子同单模腔场的非线性相互作用,研究表明:在激发场场强达到一定阈值以后,两个原子的合作辐射效应变成同步辐射,即多原子系统在一定阈值条件下可以有组织成相当于一个大原子的系统,而产生同步有序辐射。同时,由于这种同步辐射效应,两原子系统的受激辐射的二阶相干度相对于单原子系统的要大,即聚束效应强而反聚束效应弱。另外,两原子系统由于多光子过程的加强而有更深的压缩效应,此时要求的激发场场强也比单原子系统的要强。

JAYNES-CUMMINGS MODEL OF TWO CASCADE THREE-LEVEL ATOMS AND ITS NONLINEAR PROPERTY

In this paper, we have studied the nonlinear interaction of two cascade three-level atoms with single mode field. The results show that the cooperative emission of two atoms can translate into synchronous when the strength of exciting field reaches a certain threshold, That is self-organization may occur in many-atom system to form a "large atom system" at the thre-shold, producing synchronous ordered emission Meanwhile, the second-order correlation degree of two-atom system is larger than that of single atom system due to the synchronous emission effect, i.e. bunching is strong but antibunching is weak. Moreover, the deeper squeezing of two-atom system is obtained since many-photon processes become stronger, and the stren-gth of exciting field is reguired to be also stronger.