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Modeling of intracavity-pumped Q-switched terahertz parametric oscillators based on stimulated polariton scattering
Optics Express ( IF 3.8 ) Pub Date : 2020-02-24 , DOI: 10.1364/oe.385493
Peng Wang , Xingyu Zhang , Zhenhua Cong , Zhaojun Liu , Xiaohan Chen , Zengguang Qin , Feilong Gao , Jinjin Xu , Zecheng Wang , Na Ming

In this paper, the rate equations describing the operation of intracavity-pumped Q-switched terahertz parametric oscillators based on stimulated polariton scattering are given for the first time. The rate equations are obtained under the plane-wave approximation, the oscillating fundamental and Stokes waves are supposed to be round uniform beam spots. Considering the fact that the terahertz wave nearly traverses the pump and Stokes beams and using the coupled wave equations, the terahertz wave intensity is expressed as the function of the fundamental and Stokes intensities. Thus, the rate equations describing the evolution processes of the fundamental and Stokes waves are obtained in the first step. The THz wave properties are then obtained. Several curves based on the rate equations are generated to illustrate the effects of the nonlinear coefficient, the THz wave absorption coefficient, and pulse repetition rate on the THz laser characteristics. Taking the intracavity-pumped Mg:LiNbO3 TPO as an example, the THz frequency tuning characteristic and the dependences of the fundamental, Stokes, and THz wave powers on the incident diode pump power are calculated. The theoretical results are in agreement with the experimental results on the whole.

中文翻译:

基于受激极化子散射的腔内泵浦Q开关太赫兹参数振荡器的建模

本文首次给出了基于激发极化子散射的描述腔内泵浦Q开关太赫兹参量振荡器工作的速率方程。速率方程是在平面波近似下获得的,假定振荡基波和斯托克斯波是圆形均匀束斑。考虑到太赫兹波几乎横穿泵浦和斯托克斯束,并使用耦合波方程,太赫兹波强度表示为基波和斯托克斯强度的函数。因此,在第一步中获得了描述基波和斯托克斯波演化过程的速率方程。然后获得太赫兹波特性。生成了基于速率方程的几条曲线,以说明非线性系数,太赫兹波吸收系数和脉冲重复频率对太赫兹激光特性的影响。腔内抽Mg:LiNbO以3 TPO为例,计算了THz频率调谐特性以及基波,斯托克斯和THz波功率对入射二极管泵浦功率的依赖性。理论结果与实验结果基本吻合。
更新日期:2020-03-02
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