Strong terahertz radiation from air plasmas generated by an aperture-limited Gaussian pump laser beam
Strong terahertz radiation from air plasmas generated by an aperture-limited Gaussian pump laser beam
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DOI：
10.1063/1.3098357
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发表时间：
2009-03
影响因子：
4
通讯作者：
Xiao-yu Peng;Chun Xing Li;Min Chen;T. Toncian;R. Jung;O. Willi;Yutong Li;Weimin Wang;
中科院分区：
文献类型：
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作者：
Xiao-yu Peng;Chun Xing Li;Min Chen;T. Toncian;R. Jung;O. Willi;Yutong Li;Weimin Wang;
通过将基波激光脉冲及其二次谐波聚焦到周围空气中产生的太赫兹辐射随着泵浦激光能量的增加而强烈饱和。我们演示了一种简单的方法来控制高斯泵浦激光束，以提高可调孔径的太赫兹辐射输出。在最优的限制光阑的泵浦光束下，与无光阑情况相比，泵浦激光参数的不同可使太赫兹波幅值提高8倍以上。
Terahertz radiation generated by focusing the fundamental laser pulse and its second harmonic into ambient air strongly saturates with increasing pump laser energy. We demonstrate a simple method to control the Gaussian pump laser beam to improve the output of terahertz radiation with an adjustable aperture. With the optimal aperture-limited pump laser beams, the terahertz wave amplitudes can be enhanced by more than eight times depending on the pump laser parameters than those of aperture-free cases.