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http://dx.doi.org/10.3807/COPP.2017.1.2.138

Terahertz Generation Based on Cascaded Difference Frequency Generation with Periodically-poled KTiOPO4  

Li, Zhongyang (North China University of Water Resources and Electric Power)
Wang, Silei (North China University of Water Resources and Electric Power)
Wang, Mengtao (North China University of Water Resources and Electric Power)
Wang, Weishu (North China University of Water Resources and Electric Power)
Publication Information
Current Optics and Photonics / v.1, no.2, 2017 , pp. 138-142 More about this Journal
Abstract
Terahertz (THz) generation by periodically-poled $KTiOPO_4$ (PPKTP) with a quasi-phase-matching scheme based on cascaded difference frequency generation (DFG) processes is theoretically analyzed. The cascaded Stokes interaction processes and the cascaded anti-Stokes interaction processes are investigated from coupled wave equations. THz intensities and quantum conversion efficiency are calculated. Compared with non-cascaded DFG processes, THz intensities from 10-order cascaded DFG processes are increased to 5.53. The quantum conversion efficiency of 479.4% in cascaded processes, which exceeds the Manley-Rowe limit, can be realized.
Keywords
Terahertz wave; Cascaded difference frequency generation; $KTiOPO_4$;
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