Terahertz waves generation using the isomorphs of PPKTP crystal: a theoretical investigation

Highly efficient terahertz (THz) wave sources based on difference frequency generation (DFG) process in nonlinear optical crystals play an important role for the applications of THz wave. In order to find more novel nonlinear crystals, here we theoretically investigate the generation of THz wave using the isomorphs of periodically poled \mathrm{KTiOPO_4}(PPKTP), including periodically poled RTP, KTA, RTA and CTA. By solving the cascaded...