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借助抽运_探测技术研究了ZnTe晶体中光学整流产生的太赫兹 (THz)辐射 ,利用ZnTe晶体的线性电光效应探测THz辐射场分布 ,观察到了较窄 (约为 0 2ps)的THz场分布及相应较宽 (响应超过 4THz ,半峰宽约为 2 4THz)的THz频谱 ,并运用琼斯矩阵对实验结果进行了理论拟合 .研究了飞秒激光脉冲波长 (750— 850nm)、脉冲宽度 (56—2 2 5fs)和晶体旋转与THz辐射产生的关系 .同时改变探测光偏振方向进行偏振调制 ,并从理论上分析了偏振调制对THz辐射探测的影响
The terahertz (THz) radiation generated by optical rectification in ZnTe crystals was studied by the pump-probe technique. The THz radiation field distribution was detected by the linear electro-optical effect of ZnTe crystals. A narrow (about 0 2ps) THz field distribution was observed. (Corresponding to more than 4THz, half-peak width of about 24Hz) THz spectra, and using the Jones matrix to experimentally fit the experimental results.The effects of the femtosecond laser pulse wavelength (750-850nm), pulse width -2 2 5fs) and the relationship between the crystal rotation and the THz radiation.The polarization modulation of the probe light was changed at the same time, and the influence of the polarization modulation on THz radiation detection was theoretically analyzed