Highly sensitive coherent detection of terahertz waves at room temperature using a parametric process
Highly sensitive coherent detection of terahertz waves at room temperature using a parametric process
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DOI：
10.1063/1.2953452
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发表时间：
2008-07-14
影响因子：
4
通讯作者：
Ito, Hiromasa
中科院分区：
文献类型：
--
作者：
Guo, Ruixiang;Ohno, Seigo;Ito, Hiromasa
报道了利用非线性MgO：LiNbO3晶体的频率转换技术在室温下相干探测窄线宽纳秒太赫兹辐射的实验结果。将太赫兹辐射与近红外强泵浦脉冲混合导致差频分量的激发和放大，该差频分量用基于InGaAs的光电二极管检测。我们证明了这种方法在一个快速和非常敏感的太赫兹波探测器。该探测器能够以纳秒分辨率捕获太赫兹脉冲的时间分布，并且比典型的用于探测纳秒脉冲太赫兹波光束的液氦冷却硅测辐射热计灵敏至少一个数量级。(C)2008年美国物理学会。
We report the experimental results of coherent detection of narrow-linewidth nanosecond terahertz radiation at room temperature using frequency conversion in a nonlinear MgO:LiNbO3 crystal. Mixing the terahertz radiation with a near-infrared intense pump pulse results in the excitation and amplification of the difference-frequency component, which is detected with an InGaAs-based photodiode. We demonstrate this method in a fast and very sensitive terahertz wave detector. The detector is capable of capturing the temporal profile of terahertz pulses with nanosecond resolution, and is at least one order more sensitive than a typical liquid-He-cooled Si bolometer for detecting nanosecond pulsed terahertz wave beams. (C) 2008 American Institute of Physics.