铌酸锂
太赫兹辐射
极化
能量转换效率
光学
材料科学
非线性光学
光电子学
物理
铁电性
激光器
电介质
作者
Zhongyang Li,Binzhe Jiao,Wenkai Liu,Qingfeng Hu,Gege Zhang,Qianze Yan,Pibin Bing,Fengrui Zhang,Zhan Wang,Jianquan Yao
出处
期刊:Chinese Physics B
[IOP Publishing]
日期:2021-04-01
卷期号:30 (4): 044211-044211
被引量:3
标识
DOI:10.1088/1674-1056/abe3eb
摘要
High-efficiency terahertz (THz) wave generation with multiple frequencies by optimized cascaded difference frequency generation (OCDFG) is investigated at 100 K using a nonlinear crystal consisting of a periodically poled lithium niobate (PPLN) part and an aperiodically poled lithium niobate (APPLN) part. Two infrared pump waves with a frequency difference ω T1 generate THz waves and a series of cascaded optical waves in the PPLN part by cascaded difference frequency generation (CDFG). The generated cascaded optical waves with frequency interval ω T1 then further interact in the APPLN part by OCDFG, yielding the following two advantages. First, OCDFG in the APPLN part is efficiently stimulated by inputting multi-order cascaded optical waves rather than the only two intense infrared pump waves, yielding unprecedented energy conversion efficiencies in excess of 37% at 1 THz at 100 K. Second, THz waves with M times ω T1 are generated by mixing the m th-order and the ( m + M )th-order cascaded optical waves by designing poling period distributions of the APPLN part.
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