Coherent heterodyne time-domain spectrometry covering the entire "terahertz gap"
Coherent heterodyne time-domain spectrometry covering the entire "terahertz gap"
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DOI：
10.1063/1.2828709
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发表时间：
2008-01-07
影响因子：
4
通讯作者：
Johnson, Keith
中科院分区：
文献类型：
--
作者：
Karpowicz, Nicholas;Dai, Jianming;Johnson, Keith
太赫兹波，通常定义在0.3和10 THz之间的光谱区域中的电磁辐射，允许创新的传感和成像技术，可以提供其他波长无法提供的光谱信息。然而，同时强烈，宽带和相干光谱测量仍然具有挑战性。我们报告光谱使用飞秒脉冲电离的气体产生和感测宽带太赫兹脉冲。使用相干外差技术，测量跨越“太赫兹间隙”，从0.3到10太赫兹的最大信号的>= 10%。该光谱仪使用回收的光学探测光束和相干检测，提供了高场强和时间分辨的测量。
Terahertz waves, electromagnetic radiation in the spectral region commonly defined between 0.3 and 10 THz, allow innovative sensing and imaging techniques that can provide spectroscopic information unavailable at other wavelengths. However, simultaneously intense, broadband, and coherent spectroscopic measurement remains challenging. We report spectrometry using gases ionized by femtosecond pulses to generate and sense broadband terahertz pulses. Using a coherent heterodyne technique, the measurements span the "terahertz gap" with >= 10% of the maximum signal from 0.3 to 10 THz. This spectrometer, using a recycled optical probe beam and coherent detection, offers a high field strength and time-resolved measurement.