| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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High-efficiency terahertz wave generation with multiple frequencies by optimized cascaded difference frequency generation |
| Zhongyang Li(李忠洋)1,†, Binzhe Jiao(焦彬哲)1, Wenkai Liu(刘文锴)2, Qingfeng Hu(胡青峰)2, Gege Zhang(张格格)1, Qianze Yan(颜钤泽)1, Pibin Bing(邴丕彬)1, Fengrui Zhang(张风蕊)1, Zhan Wang(王湛)1, and Jianquan Yao(姚建铨)3 |
1 College of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;
2 College of Surveying and Geo-informatics, North China University of Water Resources and Electric Power, Zhengzhou 450045, China;
3 College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072, China
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Abstract 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 mth-order and the (m+M)th-order cascaded optical waves by designing poling period distributions of the APPLN part.
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Received: 11 January 2021
Revised: 03 February 2021
Accepted manuscript online: 07 February 2021
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PACS:
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42.65.Yj
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(Optical parametric oscillators and amplifiers)
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42.65.Dr
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(Stimulated Raman scattering; CARS)
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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61735010, 31671580, and 61601183), the Natural Science Foundation of Henan Province, China (Grant No. 162300410190), and Program for Science &Technology Innovation Talents in Universities of Henan Province, China (Grant No. 18HASTIT023). |
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Corresponding Authors:
†Corresponding author. E-mail: thzwave@163.com
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Cite this article:
Zhongyang Li(李忠洋), Binzhe Jiao(焦彬哲), Wenkai Liu(刘文锴), Qingfeng Hu(胡青峰), Gege Zhang(张格格), Qianze Yan(颜钤泽), Pibin Bing(邴丕彬), Fengrui Zhang(张风蕊), Zhan Wang(王湛), and Jianquan Yao(姚建铨) High-efficiency terahertz wave generation with multiple frequencies by optimized cascaded difference frequency generation 2021 Chin. Phys. B 30 044211
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