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Terahertz radiation from bismuth surface induced by femtosecond laser pulses

机译:飞秒激光脉冲从铋表面产生的太赫兹辐射

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We report on the first experimental observation of terahertz (THz) wave generation from bismuth mono- and polycrystalline samples irradiated by femtosecond laser pulses. Dependencies of the THz signal on the crystal orientation, optical pulse energy, incidence angle, and polarization are presented and discussed together with features of the sample surfaces. The optical-to-THz conversion efficiency was up to two orders of magnitude higher than for metal at a moderate fluence of similar to 1 mJ/cm(2). We also found non-linear effects not previously observed using other metal and semiconductor materials: (a) asymmetry of THz response with respect to a half-turn of a sample around its normal, (b) THz polarization control by orientation of the sample surface, and (c) strong enhancement of optical-to-THz conversion after structuring of a sample with optically large-scale parallel strips pattern. (C) 2016 Optical Society of America
机译:我们报告了飞秒激光脉冲辐照的铋单晶和多晶样品产生太赫兹(THz)波的首次实验观察。提出并讨论了THz信号对晶体取向,光脉冲能量,入射角和偏振的依赖性,以及样品表面的特征。在大约1 mJ / cm(2)的中等通量下,光到THz的转换效率比金属高出两个数量级。我们还发现以前没有使用其他金属和半导体材料观察到的非线性效应:(a)太赫兹响应相对于样品围绕其法线半圈的不对称性,(b)通过样品表面取向控制太赫兹偏振;以及(c)在构造具有光学大规模平行条纹图案的样品后,极大地增强了光学到THz的转换。 (C)2016美国眼镜学会

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