论文标题
Mapbbr $ _3 $ HALIDE PEROVSKITE单晶的放大自发排放和随机激光
Amplified Spontaneous Emission and Random Lasing in MAPbBr$_3$ Halide Perovskite Single Crystals
论文作者
论文摘要
卤化物钙钛矿是具有高可调节性和简单溶液合成的有前途的光学增益介质。在这项研究中，在同一Mapbbr $ _3 $ halide Perovskite单晶中证明了两个增益机制，即自发发射和随机激光。为此，在4 k的温度下测量光致发光，并以80 MHz的重复速率通过紫外线泵送脉冲飞秒泵送。由于裂纹和晶体缺陷而形成随机谐振器的样品区域，观察到随机激光。在样品的更均匀的区域中，主要的状态被放大自发发射。这两个方案是可靠的，由线宽度，模式结构，阈值后强度的生长以及辐射的极化程度。刺激的发射的光谱定位远低于结合的激子共振，这提出了一个关于卤化物钙钛矿激光器发射的起源的问题。
Halide perovskites are a promising optical gain media with high tunability and simple solution synthesis. In this study, two gain regimes, namely amplified spontaneous emission and random lasing, are demonstrated in same MAPbBr$_3$ halide perovskite single crystal. For this, photoluminescence is measured at a temperature of 4 K with pulsed femtosecond pumping by UV light with a 80 MHz repetition rate. Random lasing is observed in areas of the sample where a random resonator was formed due to cracks and crystal imperfections. In more homogeneous regions of the sample, the dominant regime is amplified spontaneous emission. These two regimes are reliably distinguished by the line width, the mode structure, the growth of the intensity after the threshold, and the degree of polarization of the radiation. The spectral localization of the stimulated emission well below the bound exciton resonance raises a question concerning the origin of the emission in halide perovskite lasers.
