Hokr Brett H, Bixler Joel N, Cone Michael T, Mason John D, Beier Hope T, Noojin Gary D, Petrov Georgi I, Golovan Leonid A, Thomas Robert J, Rockwell Benjamin A, Yakovlev Vladislav V
1] Department of Physics & Astronomy, Texas A&M University, College Station, Texas 77843, USA [2] Department of Biomedical Engineering, Texas A&M University, Texas 77843, USA.
Department of Biomedical Engineering, Texas A&M University, Texas 77843, USA.
Nat Commun. 2014 Jul 11;5:4356. doi: 10.1038/ncomms5356.
Random lasers are a developing class of light sources that utilize a highly disordered gain medium as opposed to a conventional optical cavity. Although traditional random lasers often have a relatively broad emission spectrum, a random laser that utilizes vibration transitions via Raman scattering allows for an extremely narrow bandwidth, on the order of 10 cm(-1). Here we demonstrate the first experimental evidence of lasing via a Raman interaction in a bulk three-dimensional random medium, with conversion efficiencies on the order of a few percent. Furthermore, Monte Carlo simulations are used to study the complex spatial and temporal dynamics of nonlinear processes in turbid media. In addition to providing a large signal, characteristic of the Raman medium, the random Raman laser offers us an entirely new tool for studying the dynamics of gain in a turbid medium.
随机激光器是一类正在发展的光源，它使用高度无序的增益介质，与传统光学腔不同。尽管传统随机激光器通常具有相对较宽的发射光谱，但利用拉曼散射的振动跃迁的随机激光器能够实现极窄的带宽，约为10厘米⁻¹量级。在此，我们展示了在块状三维随机介质中通过拉曼相互作用实现激光发射的首个实验证据，转换效率约为百分之几。此外，蒙特卡罗模拟用于研究浑浊介质中非线性过程的复杂空间和时间动态。除了提供拉曼介质特有的大信号外，随机拉曼激光器为我们提供了一个全新的工具，用于研究浑浊介质中增益的动态。
