Creation of multi-frequency terahertz waves by optimized cascaded difference frequency generation
Zhong-Yang Li(李忠洋)1,†, Jia Zhao(赵佳)1, Sheng Yuan(袁胜)1, Bin-Zhe Jiao(焦彬哲)1, Pi-Bin Bing(邴丕彬)1, Hong-Tao Zhang(张红涛)1, Zhi-Liang Chen(陈治良)1, Lian Tan(谭联)1, and Jian-Quan Yao(姚建铨)2
1 College of Electric Power, North China University of Water Resources and Electric Power, Zhengzhou 450045, China; 2 College of Precision Instrument and Opto-electronics Engineering, Institute of Laser and Opto-electronics, Tianjin University, Tianjin 300072, China
Abstract A new scheme which generates multi-frequency terahertz (THz) waves from planar waveguide by the optimized cascaded difference frequency generation (OCDFG) is proposed. A THz wave with frequency ωT1 is generated by the OCDFG with two infrared pump waves, and simultaneously a series of cascaded optical waves with a frequency interval ωT1 is generated. The THz wave with a frequency of M-times ωT1 is generated by mixing the m-th-order and the (m+M)-th-order cascaded optical wave. The phase mismatch distributions of cascaded difference frequency generation (CDFG) are modulated by changing the thickness of planar waveguide step by step, thereby satisfying the phase-matching condition from first-order to high-order cascaded Stokes process step by step. As a result, the intensity of THz wave can be enhanced and modulated by controlling the cascading order of OCDFG.
(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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 the Program for Science & Technology Innovation Talents in Universities of Henan Province, China (Grant No. 18HASTIT023).
Corresponding Authors:
Zhong-Yang Li
E-mail: thzwave@163.com
Cite this article:
Zhong-Yang Li(李忠洋), Jia Zhao(赵佳), Sheng Yuan(袁胜), Bin-Zhe Jiao(焦彬哲), Pi-Bin Bing(邴丕彬), Hong-Tao Zhang(张红涛), Zhi-Liang Chen(陈治良), Lian Tan(谭联), and Jian-Quan Yao(姚建铨) Creation of multi-frequency terahertz waves by optimized cascaded difference frequency generation 2022 Chin. Phys. B 31 044205
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