Highly efficient backward stimulated polariton scattering in periodically poled KTiOPO4
2015
χ (2) -nonlinearity enhanced by crystal lattice contribution in the THz-region is behind backward stimulated polariton scattering with efficiencies exceeding 50% in PPKTP where forward scattering process is suppressed. 10-times compression of counter-propagating signal is observed.
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