Creation of multi-frequency terahertz waves by optimized cascaded difference frequency generation

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 ω T1 is generated by the OCDFG with two infrared pump waves, and simultaneously a series of cascaded optic...

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Bibliographic Details
Published in:Chinese physics B 2022-03, Vol.31 (4), p.44205-407
Main Authors: Li, Zhong-Yang, Zhao, Jia, Yuan, Sheng, Jiao, Bin-Zhe, Bing, Pi-Bin, Zhang, Hong-Tao, Chen, Zhi-Liang, Tan, Lian, Yao, Jian-Quan
Format: Article
Language:English
Subjects:
multi-frequency terahertz wave
optimized cascaded difference frequency generation
planar waveguide
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Summary: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 ω T1 is generated by the OCDFG with two infrared pump waves, and simultaneously a series of cascaded optical waves with a frequency interval ω T1 is generated. The THz wave with a frequency of M -times ω T1 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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/ac29b4