直拉法周期极化Mg：Y：LiNbO3晶体光整流产生太赫兹波
Terahertz generation in Czochralski grown periodically poled Mg:Y:LiNbO3 via optical rectification
摘要：
采用正则泵浦-探测实验技术，研究了提拉法生长的周期极化Mg：Y：LiNbO 3（PPLN）晶体中通过光整流和混频产生和探测太赫兹（THz）波。对于非线性光栅周期为0.03和0.06 mm的PPLN，分别获得了频率为1.37 THz和0.68 THz以及1.8 THz的THz波。考虑低频声子-极化激元模的色散和阻尼，建立了一个通用的理论模型。研究结果表明，通过泵浦脉冲整流，可以在正向和反向产生太赫兹波。产生的太赫兹波取决于激光脉冲的光谱形状、准相位失配和晶体的色散特性。
英文摘要：
Using a canonical pump-probe experimental technique, we studied the terahertz (THz) waves generation and detection via optical rectification and mixing in Czochralski-grown periodically poled Mg:Y:LiNbO3 (PPLN) crystals. THz waves with frequencies at 1.37 THz and 0.68 THz as well as 1.8 THz were obtained for PPLN with nonlinear grating periods of 0.03 and 0.06 mm, respectively. A general theoretical model was developed by considering the dispersion and damping of low frequency phonon-polariton mode. Our results show that THz waves are generated in forward and backward directions via pumping pulse rectification. The generated THz waves depend on the spectral shape of the laser pulses, quasi-phase mismatches and dispersion characteristics of a crystal.
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