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Terahertz (THz) generation by periodically-poled RbTiOPO4 (PPRTP) with a quasi-phase-matching scheme based on cascaded difference frequency generation (DFG) processes is theoretically analyzed. The cascaded Stokes and anti-Stokes interaction processes are investigated from coupled wave equations. The THz intensities and quantum conversion efficiency are calculated. Compared with that of non-cascaded DFG processes, the THz intensity in 7-order cascaded DFG processes is increased to 2.95 times. The quantum conversion efficiency of 149.9% in cascaded processes can be realized, which exceeds the Manley-Rowe limit. 相似文献
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The characteristics of noncollinear phase matching and quasi-phase-matching in the THz-wave parametric oscillator(TPO) are investigated.The expression of the effective parametric gain length under the condition of noncollinear phase matching configuration is deduced.The relationship between the poling period of periodically poled LiNbO3 crystal and the generated THz frequency under the condition of quasi-phase-matching configuration is analyzed.Based on the analyses above we propose a new TPO configuration which ensures the three mixing waves interact collinearly.The effects of operation temperature on phase matching are analyzed. 相似文献
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太赫兹波在二维正方晶格光子晶体中的传播特性 总被引:1,自引:0,他引:1
本文用平面波展开法研究了太赫兹波(THz)在二维正方晶格光子晶体中的传播特性。分析了晶格常数为a=0.1mm的正方晶格介质柱二维光子晶体,在0~1.8THz频段范围内,通过数值计算,发现当介质圆柱半径r=0.2a时,E偏振出现最大绝对光子带隙,带隙位于0.283-0.400THz,带隙宽度为0.117THz,相应的带隙波长范围为84.9μm至120μm,处于THz波段,并分析了随着相对介电常数差值的增大出现的TM带隙宽度增大。研究结果为THz器件的开发提供了理论依据。 相似文献
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理论分析了有机晶体2-[3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene]malononitrile(OH1)中基于共线相位匹配级联光学差频产生太赫兹波的物理过程。从耦合波方程出发分析了级联斯托克斯过程和级联反斯托克斯过程,计算了太赫兹波的强度和量子转换效率。相对于非级联光学差频过程,13阶级联光学差频产生的太赫兹波强度增大了15.96倍。13阶级联光学差频中太赫兹波的量子转换效率为1377%,超过了Manley-Rowe关系的限制。 相似文献