Kim Vyacheslav V, Ganeev Rashid A, Konda Srinivasa Rao, Boltaev Ganjaboy S, Sapaev Ibrohim B, Yu Weili, Li Wei
GPL Photonics Lab, State Key Laboratory of Applied Optics, Fine Mechanics and Physics, Changchun Institute of Optics, Chinese Academy of Sciences, Changchun, 130033, China.
Laboratory of Nonlinear Optics, Institute of Astronomy, University of Latvia, Jelgavas iela 3, Riga, 1004, LV, Latvia.
Sci Rep. 2022 Jun 1;12(1):9128. doi: 10.1038/s41598-022-13010-w.
High-order harmonics generation in the laser-induced plasmas produced on the surfaces of lead-free perovskites is studied. We analyze the harmonics generation in (CHNH)CuCl and (CHNH)CuBr plasmas during their ablation by the femtosecond, picosecond, and nanosecond pulses. The modifications of the high-order harmonics spectra are studied using the -color pump scheme (800 nm and 400 nm, 40 fs pulses). The influence of the variations of laser chirp and pulse duration on the dynamics of high-order harmonics generation is examined. The spectral shift, chirp-related harmonic cutoff scaling, and the role of the pulse duration of converting and heating laser radiation are examined at different conditions of plasma formation and harmonic generation. The dependencies of the pulse duration and the fluence of heating pulses on the harmonic's blue shift are found. The effect of harmonics broadening and splitting on the two red- and blue-shifted components is demonstrated.
研究了无铅钙钛矿表面激光诱导等离子体中的高次谐波产生。我们分析了在飞秒、皮秒和纳秒脉冲烧蚀（CHNH）CuCl和（CHNH）CuBr等离子体过程中的谐波产生。使用双色泵浦方案（800nm和400nm，40fs脉冲）研究了高次谐波光谱的变化。研究了激光啁啾和脉冲持续时间的变化对高次谐波产生动力学的影响。在等离子体形成和谐波产生的不同条件下，研究了光谱移动、与啁啾相关的谐波截止标度以及转换和加热激光辐射的脉冲持续时间的作用。发现了加热脉冲的脉冲持续时间和能量密度对谐波蓝移的依赖性。展示了谐波展宽和分裂对两个红移和蓝移分量的影响。
