Knitter Sebastian, Kues Michael, Haidl Michael, Fallnich Carsten
Opt Express. 2013 Dec 16;21(25):31591-603. doi: 10.1364/OE.21.031591.
Simulations on three-dimensional random lasers were performed by finite-difference time-domain integration of Maxwell's equations combined with rate-equations providing gain. We investigated the frequency-dependent emission polarization of random lasers in the far-field of the sample and characterized the influence of anisotropic pumping in orthogonal polarizations. Under weak scattering, the polarization states of random lasing modes were random for isotropic pumping and linear under anisotropic pumping. These findings are in accordance with recent experimental observations. A crossover was observed towards very strong scattering, in which the scattering destroys the pump-induced polarization-anisotropy of the random lasing modes and randomizes (scrambles) the mode-polarization.
通过将麦克斯韦方程组的时域有限差分积分与提供增益的速率方程相结合，对三维随机激光器进行了模拟。我们研究了样品远场中随机激光器的频率相关发射偏振，并表征了正交偏振下各向异性泵浦的影响。在弱散射条件下，对于各向同性泵浦，随机激光模式的偏振态是随机的，而在各向异性泵浦下是线性的。这些发现与最近的实验观察结果一致。在极强散射情况下观察到了一种转变，其中散射破坏了随机激光模式的泵浦诱导偏振各向异性，并使模式偏振随机化（扰乱）。
