微波激射器注入原子的反转特性  

Properties of the injected atomic inversion in the micromaser

作　　者：吴曙东[1] 陈爱喜[1] 金丽霞[1] 

机构地区：[1]华中科技大学物理系,武汉430074

出　　处：《物理学报》2003年第7期1630-1634,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :90 10 80 2 610 12 5 419和 60 0 780 2 3 )资助的课题~~

摘　　要：建立了含克尔介质微波激射器腔场稳态光子数分布的表达式 .研究了在热原子、临界和超冷原子的方式下微波激射器中原子在稳态时的反转特性 .结果表明 :注入的二能级原子在不同方式下 ,原子的反转特性不一样 .在热原子方式下 ,原子在一部分腔长L的区域无反转 ,且随原子注入速率的增大 ,反转区域和反转概率增大 .在临界方式下 ,原子的反转呈现周期性的坍塌和复苏现象 .而在冷原子方式下 ,原子在腔长L的全部区域无反转 .克尔效应和失谐量使原子的反转概率减小 .In this paper, we establish the expression of photon statistics in the steady state in the micromaser with Kerr medium cavity, study the properties of the atomic inversion in a stationary state when the atom is in thermal-atom, critical or ultracold - atom regimes in a micromaser. The results show that the properties of the atomic inversion in different regimes are very distinct. In the thermal - atom regime I there are some regions of the cavity length L where the atoms are inversive, with the increase of the atomic injection rate r, the regions of atomic inversion and the probability of the atomic inversion increase. In the critical regime, atomic inversion exhibits the collapse and revival phenomena. However, in ultracold-atom regime, there are all regions of the cavity length L where the atoms are not inversive. Kerr effect and the detuning make the probability of the atomic inversion smaller.

关 键 词：微波激射器 原子反转特性 光子统计 克尔效应 二能级原子 失谐量 量子电动力学 

分 类 号：O413.2[理学—理论物理] TN12[理学—物理]