Abstract

This work demonstrates a total-internal-reflection-based optical rotation quasi-phase-matching technique availing polarization rotation under the influence of an external electric field in a rectangular-shaped potassium niobate crystal coated with a thin layer of gallium phosphide. This thin film is utilized to regulate the phase shifts caused by the propagation of $p$- and $s$-polarized light at the slab-film interface at each total internal reflection bounce point. The peak conversion efficiency of 3.3%/W/cm, obtained from the computer-aided simulation, reflects the combined field effect of optical rotation quasi-phase-matching and fractional quasi-phase-matching techniques. The effect of optical losses and the nonlinear law of reflection have also been included to simulate the generation of a second-harmonic wavelength of 2150 nm.

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