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We investigate the generation of ultraviolet (UV) second-harmonic radiationon the boundary of a UV transparent crystal, which is derived from theautomatic partial phase matching of the incident wave and the total internalreflection. By adhering to another UV non-transparency crystal with largersecond-order nonlinear coefficient \chi^{(2)}, an nonlinear interface withlarge disparity in \chi^{(2)} is formed and the enhancement of UVsecond-harmonic radiation is observed experimentally. The intensity of enhancedsecond harmonic wave generated at the nonlinear interface was up to 11.6 timesat the crystal boundary. As a tunable phase-matching method, it may suggestpotential applications in the UV, even vacuum-UV, spectral region.

Enhancement of UV Second-Harmonic Radiation at Nonlinear Interfaces with Discontinuous Second-order Susceptibilities