相干反馈无序激光器循环光散射探讨

Cao提出了相干反馈无序激光是由循环光散射(即多重散射形成回路)而产生的观点,但未指出不同数目的散射粒子构成的回路可能激射的相对几率.为了便于分析,对ZnO散射粒子提出了立方体、单面镜的简化模型.针对染料溶液中加入纳米ZnO粒子构成的相干反馈无序激光器以及ZnO粉末薄膜相干反馈无序激光器,通过对实验数据进行分析和计算,证明了二粒子回路比三粒子回路更容易激射,粒子越多的回路越难激射.实验支持了这一观点.

Study on recurrent light scattering in random laser with coherent feedback

Cao proposed that recurrent light scattering (multiple scattering forming close loop) results in the random laser with coherent feedback. She hasn't indicated the lasing relative probability of the close loops which are formed by different numbers scattering particles. For simplicity a model is proposed, in which ZnO scattering particle is cube and the only one of six surfaces is mirror. For the random laser with coherent feedback arising in laser dye solution containing ZnO nanoparticles or arising in ZnO powder film, according to the analysis and calculation, it is showed that the lasing is much easier to arise in the two-particle closed loop path than in the three-particle closed loop path, and the lasing is more difficult to arise in the closed loop path which contains more particles. The result is agreement with the experiments.