基于钽酸锂晶体的太赫兹波参量振荡器运转特性的研究

基于晶格振动模受激电磁耦子散射过程的基本原理，对由LiTaO₃（LT）晶体组成的太赫兹波参量振荡器（TPO）的输出调谐特性、增益和吸收损耗特性，以及基于硅棱镜阵列耦合装置的THz波输出特性等方面进行了详细的理论研究和分析.研究结果表明，基于LiTaO₃晶体A₁对称性晶格振动的特点以及自身优异的非线性光学特性，通过利用短波长抽运光、适当提高抽运能量以及缩短TPO谐振腔腔长等方法，完全可以实现LT-TPO的高性能运转，证明了LiTaO₃晶体是一种性能优良的TPO工作介质.理论计算结果及方法为以后的LT-TPO实验工作提供了详实的理论依据和实验指导. 关键词： 非线性光学 THz辐射 3晶体')" href="#">LiTaO₃晶体 电磁耦子

Investigation of the operation characteristics of terahertz-wave parametric oscillator based on LiTaO3

Based on the basic principle of the stimulated polariton scattering process, the operation characteristics of terahertz-wave parametric oscillators （TPOs） using the LiTaO₃ （LT） crystal, including the ability of frequency-tuning, THz gain and absorption coefficient and the output directivity of THz wave through the arrayed Si-prism coupler, is theoretically discussed in detail. It is found that the excellent performance of LT-TPO can be achieved through the employment of the short-wavelength pump, the high pump energy and short cavity for TPO, based on the characteristics of the A₁-symmetry polariton mode and the outstanding nonlinear optical properties of LiTaO₃, which is then proved to be a promising candidate material for TPO. The research results provide a useful guide for the future practical operation of LT-TPO.