【摘要】 基于非线性光学技术的THz源具有其独特的性能和优点,将基于非线性光学差频原理和光学参量效应,从理论上研究并分析THz波与抽运光、闲频光及相位匹配角之间的关系,得到THz波输出的条件和范围,并设计出宽波段连续可调的THz源。以调QNd∶YAG激光器和光学参量振荡器(OPO)作为抽运源,以GaSe和MgO∶LiNbO3晶体作为差频非线性晶体,根据相位匹配理论及光学参量效应,搭建两套THz波产生系统。其中,基于光学参量效应的THz辐射源有效地产生出THz信号。更多还原

【Abstract】 The THz source based on the nonlinear optical effects possesses the special properties and advantages.A theoretical study has been made for the generation of widely tunable narrow-band THz wave based on the process of the difference frequency generation(DFG) and the stimulated polariton scattering in a GaSe crystal and a MgO doped LiNbO3 crystal,respectively.The relations among the THz wave,pump wave,idler wave and phase-matching angle are analysed.The condition and range of THz radiation generation are given.A Nd∶YAG laser and an optical parametric oscillator(OPO) have been used to provide the pump and idler beams.A THz radiation generation system is built under collinear phase-matching conditions.A THz-wave parametric generator(TPG) is developed,and the TPG emits THz efficiently.更多还原