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用蒙特卡罗方法仿真了增益随机散射体中的非相干辐射,观察了非相干随机激光的特性。当抽运能量超过一定阈值时,散射体的整体辐射谱突然变窄;随着抽运能量继续增大,在光滑谱背景上会出现分离尖峰;散射体内空间某位置处频率组成不是单一的;辐射谱中某单个频率的空间方向分布和位置分布比较广。增益随机散射体中产生的非相干随机激光本质上既不同于无反馈的普通放大自发辐射,又不同于相干反馈形成的常规激光。解释了非相干随机激光辐射谱上出现分离尖峰的原因,出现这种现象是由于少数光子在增益散射体中经历较多次数散射后得到了相对充分的放大。
The noncoherent radiation in the random gain scatterer was simulated by Monte Carlo method and the characteristics of the incoherent random laser were observed. When the pumping energy exceeds a certain threshold, the overall emission spectrum of the scatterer suddenly narrows. When the pumping energy continues to increase, separation spikes appear on the smoothed spectrum background. The frequency components in a scattering space are not uniform. The spatial distribution and location of a single frequency in the radiation spectrum are relatively broad. Non-coherent stochastic lasers generated in the random-scattered-gain scatterer differ from both ordinary amplified spontaneous emission without feedback and normal lasers formed by coherent feedback. The reason for the separation spikes on the non-coherent stochastic laser radiation spectrum is explained. This phenomenon is due to the relatively sufficient amplification of a few photons after more scattering in the gain scatterer.