Guo Wei
Department of Physics and Astronomy, The University of New Mexico, Albuquerque, New Mexico 87131, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 Mar;69(3 Pt 2):036602. doi: 10.1103/PhysRevE.69.036602. Epub 2004 Mar 19.
The problem of recurrent scattering of spontaneous radiation from a randomly occupied optical lattice is discussed herein theoretically. The intensity of the scattered radiation is calculated and averaged over the random distribution of atoms trapped inside the lattice. From the intensity of the scattered radiation, two properties of random lasing are derived. First, the random lasing's strongest oscillation has a wavelength comparable to the lattice constant and, second, its emission spectrum is discontinuous. In the present paper, a quantity, the number of multiple scattering channels based on the long-range regularity possessed by an optical lattice, is defined. This quantity is found to significantly determine the magnitudes of the mean intensity of the scattered radiation and the wave decay constant.
本文从理论上讨论了随机占据的光学晶格中自发辐射的反复散射问题。计算了散射辐射的强度，并对捕获在晶格内的原子的随机分布进行了平均。从散射辐射的强度中，推导出了随机激光的两个特性。第一，随机激光的最强振荡波长与晶格常数相当；第二，其发射光谱是不连续的。在本文中，基于光学晶格所具有的长程规则性定义了一个量，即多重散射通道数。发现这个量能显著决定散射辐射平均强度的大小和波衰减常数。
