Intense terahertz pulses by four-wave rectification in air
Intense terahertz pulses by four-wave rectification in air
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DOI：
10.1364/ol.25.001210
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发表时间：
2000-08-15
期刊：
影响因子：
3.6
通讯作者：
Hochstrasser, RM
中科院分区：
文献类型：
--
作者：
Cook, DJ;Hochstrasser, RM
我们描述了一种新的四波整流方法产生的强烈，超快太赫兹（THz）脉冲的气体。放大的钛宝石激光器的基波和二次谐波输出被聚焦到类似于5 × 10（14）W/cm（2）的峰值强度。在这些条件下，观察到估计为2 kV/cm的峰值THz场;测量的功率谱峰值接近2 THz。相位相关的测量表明，这是一个相干的过程，是敏感的基波和二次谐波脉冲的相对相位。已经从氮气和氩气以及空气中观察到了可比较的THz信号。(C)2000年美国光学学会。OCIS代码：320.7110、320.7160、190.4380、260.3090。
We describe a new four-wave rectification method for the generation of intense, ultrafast terahertz (THz) pulses from gases. The fundamental and second-harmonic output of an amplified Ti:sapphire laser is focused to a peak intensity of similar to 5 x 10(14) W/cm(2). Under these conditions, peak THz fields estimated at 2 kV/cm have been observed; the measured power spectrum peaks near 2 THz. Phase-dependent measurements show that this is a coherent process and is sensitive to the relative phases of the fundamental and second-harmonic pulses. Comparable THz signals have been observed from nitrogen and argon as well as from air. (C) 2000 Optical Society of America. OCIS codes: 320.7110, 320.7160, 190.4380, 260.3090.