Resonant second harmonic generation in ZnSe bulk microcavity

Room-temperature resonant second harmonic generation is demonstrated in a ZnSe bulk microcavity with ${\mathrm{Si}}_{\mathrm{3}}{\mathrm{N}}_{\mathrm{4}}{\mathrm{/SiO}}_{\mathrm{2}}$ Bragg reflectors. The resonance occurs at the second harmonic wavelength in the blue-green spectral region and yields an enhancement of one order of magnitude in the second harmonic process. Tunability of the resonant effect between 480 and 500 nm is achieved by varying the angle of incidence.