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基于超快激光技术的THz波产生和探测

, PP. 257-267

Keywords: 光电子学,THz波,电光取样,空气探测,光电导天线,光学Dember效应,光整流,空气等离子体

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Abstract:

主要介绍利用超快激光技术产生和探测THz波辐射。THz波探测方法包括电光取样和空气探测。电光取样利用光学电光效应,采用探测激光偏振态的改变得到THz电场时域波形,广泛应用在TDS系统中。空气探测方法利用激光在空气中的三阶非线性效应,可以测得THz时域波形,并且该方法没有晶体的限制,因此可以探测频谱较宽的THz脉冲。产生THz的方法主要包括光电导天线、光学Dember效应、光整流和激光等离子体。其中前三者受到材料本征声子的影响,产生的THz谱宽有一定限制。倾斜激光脉冲波前入射非线性晶体光整流可以产生很强的THz波。双色飞秒激光脉冲与空气等离子体作用,可以产生较强的宽谱THz辐射,并且其谱宽与激光脉冲宽度密切相关。

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