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Spatial–temporal evolution of ultrashort laser pulse second harmonic generation inβ-barium borate (β-BBO) crystal
Journal of Applied Physics ( IF 3.2 ) Pub Date : 2021-06-15 , DOI: 10.1063/5.0052422
Li-Hong Hong 1 , Bao-Qin Chen 1 , Chen-Yang Hu 2 , Zhi-Yuan Li 1
Affiliation  

We establish an effective and efficient theoretical approach called the spatial–temporal broadband nonlinear coupled wave theory (ST-BNCWT) to evaluate the spatial and temporal evolution behaviors of femtosecond laser pulse second harmonic generation (SHG) in a nonlinear medium. In this method, all the frequency components comprising the fundamental-wave laser pulse participate in a series of complicated three-wave mixing nonlinear coupling, including sum-frequency generation, difference-frequency generation, and the usual SHG, to create a second harmonic wave pulse. The contribution from each three-wave mixing process is strongly influenced by the corresponding phase matching or mismatching. We have used this method to analyze systematical transmission evolution characteristics of ultrashort laser pulses in a β-barium borate crystal and disclose the variation of a number of critical physical quantities. Our ST-BNCWT methodology can greatly facilitate the deep understanding of the SHG and various pulse transmission characteristics of ultrashort laser pulses and provide great support and guidance for experimental prediction. Moreover, our scheme opens up a promising path to explore and visualize novel nonlinear optical interactions in solid-state materials spanning the spatial and temporal domain, which are very helpful for building versatile ultrafast lasers in various spectral windows via powerful nonlinear frequency conversion technology against a basic high-performance ultrafast laser such as a Ti:sapphire femtosecond laser.

中文翻译:

β-硼酸钡(β-BBO)晶体中超短激光脉冲二次谐波产生的时空演化

我们建立了一种有效且高效的理论方法,称为时空宽带非线性耦合波理论 (ST-BNCWT),以评估非线性介质中飞秒激光脉冲二次谐波产生 (SHG) 的时空演化行为。在该方法中,构成基波激光脉冲的所有频率分量参与一系列复杂的三波混频非线性耦合,包括和频产生、差频产生和通常的SHG,从而产生二次谐波脉冲。每个三波混频过程的贡献受到相应相位匹配或失配的强烈影响。我们已经使用这种方法分析了超短激光脉冲在β 中的系统传输演化特性。-硼酸钡晶体并揭示了一些关键物理量的变化。我们的ST-BNCWT方法可以极大地促进对超短激光脉冲的SHG和各种脉冲传输特性的深入理解,并为实验预测提供极大的支持和指导。此外,我们的方案开辟了一条探索和可视化跨越时空域的固态材料中新型非线性光学相互作用的有希望的途径,这对于通过强大的非线性频率转换技术在各种光谱窗口中构建多功能超快激光器非常有帮助。基本的高性能超快激光器,如钛:蓝宝石飞秒激光器。
更新日期:2021-06-21
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