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Efficient broadband 400 nm noncollinear second-harmonic generation of chirped femtosecond laser pulses in BBO and LBO

机译:BBO和LBO中in的飞秒激光脉冲的高效宽带400 nm非共线二次谐波产生

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摘要

We report on 400 nm broadband type I frequency doubling in a noncollinear geometry with pulse-fronttilted and chirped femtosecond pulses (λ_0 = 800 nm; Fourier transform limited pulse duration, 45 fs). With moderate power densities (2 to 10 GW/cm~2) thus avoiding higher-order nonlinear phenomena, the energy conversion efficiency was up to 65%. Second-harmonic pulses of Fourier transform limited pulse duration shorter than the fundamental wave were generated, exhibiting good beam quality and no pulse-front tilt. High energy (20 mJ/pulse) was produced in a 40 mm diameter and 6 mm thick LBO crystal. To the best of our knowledge, this is the first demonstration of this optical configuration with sub-100-fs pulses. Good agreement between experimental results and simulations is obtained.
机译:我们报告了非共线几何结构中的400 nm宽带I型倍频,它具有脉冲倾斜和chi飞秒脉冲(λ_0= 800 nm;傅立叶变换限制的脉冲持续时间,45 fs)。在中等功率密度(2至10 GW / cm〜2)下避免高阶非线性现象,能量转换效率高达65%。产生了比基波短的傅里叶变换有限脉冲持续时间的二次谐波脉冲,显示出良好的光束质量并且没有脉冲前倾斜。在40 mm直径和6 mm厚的LBO晶体中产生了高能量(20 mJ /脉冲)。据我们所知,这是这种具有低于100-fs脉冲的光学配置的首次演示。实验结果与模拟之间取得了良好的一致性。

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