Efficient broadband 400 nm noncollinear second-harmonic generation of chirped femtosecond laser pulses in BBO and LBO.
Efficient broadband 400 nm noncollinear second-harmonic generation of chirped femtosecond laser pulses in BBO and LBO.
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DOI：
10.1364/ao.53.002646
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发表时间：
2014-04
期刊：
影响因子：
1.9
通讯作者：
O. Gobert;Gabriel Mennerat;R. Maksimenka;N. Fedorov;M. Perdrix;D. Guillaumet;C. Ramond;J. Habib;C. Prigent;D. Vernhet;T. Oksenhendler;M. Comte
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文献类型：
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作者：
O. Gobert;Gabriel Mennerat;R. Maksimenka;N. Fedorov;M. Perdrix;D. Guillaumet;C. Ramond;J. Habib;C. Prigent;D. Vernhet;T. Oksenhendler;M. Comte
本文报道了在非共线几何结构下，利用脉冲前倾和啁啾飞秒脉冲（λ =800 nm;傅里叶变换限制脉冲宽度，45 fs）实现400 nm宽带I型倍频。由于功率密度适中（2 ~ 10 GW/cm 2），避免了高阶非线性现象，能量转换效率高达65%。二次谐波脉冲的傅里叶变换限制的脉冲宽度短于基波产生，表现出良好的光束质量和没有脉冲前端倾斜。在直径40 mm、厚度6 mm的LBO晶体中产生高能量（20 mJ/脉冲）。据我们所知，这是第一次演示这种光学配置与亚100飞秒脉冲。实验结果与模拟结果吻合良好。
We report on 400 nm broadband type I frequency doubling in a noncollinear geometry with pulse-front-tilted and chirped femtosecond pulses (λ =800 nm; Fourier transform limited pulse duration, 45 fs). With moderate power densities (2 to 10 GW/cm2) 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.