Noncollinear Electro-Optic Sampling of Terahertz Waves in a Thick GaAs Crystal
Noncollinear Electro-Optic Sampling of Terahertz Waves in a Thick GaAs Crystal
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DOI：
10.1109/tthz.2015.2461439
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发表时间：
2015-09-01
影响因子：
3.2
通讯作者：
Bakunov, Michael I.
中科院分区：
文献类型：
--
作者：
Mashkovich, Eugene A.;Shugurov, Alexander I.;Bakunov, Michael I.
在本文中，我们提出并通过实验证明了在厘米厚的 GaAs 晶体中使用飞秒光纤激光器对太赫兹脉冲进行非共线 EO 采样。与之前在毫米和亚毫米厚的 GaAs 晶体中使用的共线 EO 采样相比，该技术将光谱分辨率提高了一个数量级以上，并显着提高了效率。发现探测光束在晶体上的最佳入射角为42°-50°，最佳晶体厚度约为1-3 cm。
In this paper, we propose and experimentally demonstrate noncollinear EO sampling of terahertz pulses with a femtosecond fiber laser in cm-thick GaAs crystals. This technique provides more than an order of magnitude improvement in spectral resolution and a significant increase in efficiency as compared to previously used collinear EO sampling in mm- and sub-mm-thick GaAs crystals. The optimal incidence angle of the probe beam on the crystal is found to be 42 degrees-50 degrees and the optimal crystal thickness is similar to 1-3 cm.