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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.
Based on the basic principle of the scattering process of excited electromagnetocalcoupler in lattice vibration mode, the output tuning characteristics, gain and absorption loss characteristics of terahertz wave parametric oscillator (TPO) composed of LiTaO3 (LT) crystal, Coupling device THz wave output characteristics of a detailed theoretical study and analysis of the results show that based on the symmetry of LiTaO3 crystal A1 lattice vibration characteristics and its own excellent nonlinear optical properties through the use of short-wavelength pumping light, TPO can fully realize the high performance operation of LT-TPO by properly increasing the pumping energy and shortening the cavity length of the TPO resonator, and it is proved that LiTaO3 crystal is a good working medium of TPO. The theoretical calculation result and the method are the LT- TPO experiment provides a detailed theoretical basis and experimental guidance.