基于Ti：Sapphire波长泵浦的BNA有机晶体的强THz源
Intense THz source based on BNA organic crystal pumped at Ti:Sapphire wavelength
摘要：
报道了用传统的钛宝石（Ti：Sa）放大器直接泵浦有机晶体N-苄基-2-甲基-4-硝基苯胺（BNA）产生的高能量太赫兹光脉冲。当泵浦激光脉冲宽度为50 fs，中心波长为800 nm时，该简单方案的光-太赫兹转换效率为0.25%。产生的辐射频率在0.2和3 THz之间。我们测量了损伤阈值以及转换效率对泵浦能量密度、泵浦波长和脉冲宽度的依赖性。
英文摘要：
We report on high energy terahertz pulses by optical rectification (OR) in the organic crystal N-benzyl-2-methyl-4-nitroaniline (BNA) directly pumped by a conventional Ti:Sapphire (Ti:Sa) amplifier. The simple scheme provides an optical to terahertz conversion efficiency of 0.25% when pumped by a collimated laser pulses with duration of 50 fs and central wavelength of 800nm. The generated radiation spans frequencies between 0.2 and 3 THz. We measured the damage threshold as well as the dependency of the conversion efficiency on the pump fluence, pump wavelength, and pulse duration.
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