Creation of multi-frequency terahertz waves by optimized cascaded difference frequency generation |
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| Affiliation: | 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 |
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| 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. |
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| Keywords: | multi-frequency terahertz wave optimized cascaded difference frequency generation planar waveguide |
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