SUPERRADIANT EFFECTS IN SYSTEMS OF TWO-LEVEL ATOMS.
SUPERRADIANT EFFECTS IN SYSTEMS OF TWO-LEVEL ATOMS.
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DOI：
10.1103/physreva.5.1094
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发表时间：
1972
影响因子：
2.9
通讯作者：
C. R. Stroud;J. Eberly;W. Lama;L. Mandel
中科院分区：
文献类型：
--
作者：
C. R. Stroud;J. Eberly;W. Lama;L. Mandel
在半经典辐射理论的框架下，研究和解决了通过电磁场耦合的二能级原子系统的时间演化问题。原子可以处于任何初始状态，并充分考虑了辐射反应。发现了超辐射和随时间变化的频移或啁啾效应。所有原子都看到相同场的假设表明，以运动常数的形式对系统的演化施加了严格的约束。这些约束是最容易描绘的原子系统的布洛赫矢量表示，他们导致明确的解决方案的时间发展的每个原子。结果表明，复杂系统的演化可以用一个集体超Bloch矢量来描述，其行为类似于单个孤立原子的Bloch矢量的行为.对运动的限制也意味着系统不能相干地辐射所有的能量;其中一些能量仍然被捕获，最终被不相干的过程耗散。给出了一些曲线来说明系统在特殊情况下的行为。
The problem of the evolution in time of a system of two-level atoms that are coupled through their electromagnetic fields, is studied and solved in the framework of semiclassical radiation theory. The atoms may be in any initial states and the radiation reaction is fully taken into account. Both superradiance and time-dependent frequency shift or chirping effects are found. The assumption that all the atoms see the same field is shown to place severe constraints on the evolution of the system, in the form of constants of the motion. These constraints are most easily pictured in terms of the Bloch-vector representation of the atomic system, and they lead to explicit solutions for the time development of each atom. It is shown that the evolution of the complex system is describable by means of a collective super Bloch vector, whose behavior is similar to the behavior of the Bloch vector for a single isolated atom. The constraints on the motion also imply that the system cannot radiate all its energy coherently; some of it remains trapped, to be dissipated ultimately by incoherent processes. Some curves are presented to illustrate the behavior of the system in special cases.