Design and characterization of traveling-wave electrooptic terahertz sensors
Design and characterization of traveling-wave electrooptic terahertz sensors
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DOI：
10.1109/2944.571769
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发表时间：
1996-09
影响因子：
4.9
通讯作者：
Qi Wu;Xicheng Zhang
中科院分区：
文献类型：
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作者：
Qi Wu;Xicheng Zhang
我们讨论了行波电光太赫兹传感器的设计考虑，其中我们分析了由于传感器晶体中速度不匹配而导致的频率响应限制。在锌闪锌矿电光材料中，发现在特定的光中心频率下，光学群速度能够匹配低频太赫兹波的相速度。在钛蓝宝石激光器的调谐范围内，我们观察到ZnTe晶体具有良好的速度匹配。利用太赫兹光整流产生的超宽带辐射，测量了短至200 fs（半最大全宽）的太赫兹脉冲。
We discuss the design considerations of traveling-wave electrooptic terahertz sensors, wherein we analyze limitations in frequency response due to velocity-mismatch in the sensor crystal. In zincblende electrooptic materials, optical group velocities are found to be able to match the phase velocity of low frequency terahertz wave at specific optical center frequencies. We observed excellent velocity-matching in ZnTe crystals within the tuning range of Ti:sapphire lasers. Terahertz pulses as short as 200 fs (full-width-at-half-maximum) have been measured using the ultra-broad-band radiation generated via terahertz optical rectification.