Abstract
Terahertz (THz) generation by periodically-poled RbTiOPO4 (PPRTP) with a quasi-phase-matching scheme based on cascaded difference frequency generation (DFG) processes is theoretically analyzed. The cascaded Stokes and anti-Stokes interaction processes are investigated from coupled wave equations. The THz intensities and quantum conversion efficiency are calculated. Compared with that of non-cascaded DFG processes, the THz intensity in 7-order cascaded DFG processes is increased to 2.95 times. The quantum conversion efficiency of 149.9% in cascaded processes can be realized, which exceeds the Manley-Rowe limit.
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This work has been supported by the National Natural Science Foundation of China (Nos.61201101, 61601183 and 61205003), the Young Backbone Teachers in University of Henan Province (No.2014GGJS-065), the Foundation and Advanced Technology Research Program of Henan Province (No.162300410269), and the Program for Innovative Research Team (in Science and Technology) in University of Henan Province (No.16IRTSTHN017).
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Li, Zy., Wang, Mt., Wang, Sl. et al. Highly efficient terahertz generation from periodically-poled RbTiOPO4 . Optoelectron. Lett. 13, 127–130 (2017). https://doi.org/10.1007/s11801-017-6253-0
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DOI: https://doi.org/10.1007/s11801-017-6253-0