Design study of efficient far-UVC second-harmonic generation using an integrated approach

摘要

This work presents an approach for continuous-wave laser emission in the far-UVC using second-harmonic generation in barium borate (BBO) thin-film waveguides. The crystal orientation is analytically considered for waveguides, and two designs with perfect modal phase matching (PhM) are simulated. The first design includes a BBO ridge-waveguide defined by dry etching. This allows for good confinement and spatial overlap of the relevant optical modes. The second design includes a strip-loaded waveguide, which aims at suppressing the side-wall scattering by confining the optical modes in the BBO thin-film. Showing that the conversion efficiency can be greatly enhanced.