Second-harmonic generation due to a guided wave structure consisting of quartz coated with a glass film

Abstract

Phase‐matched second‐harmonic generation (SHG) was obtained in the visible spectrum by using the nonlinear waveguide. The guide consisted of quartz as the cladding and glass film as the waveguiding section. y‐cut quartz was used for the nonlinear medium. A Q‐switched YAG laser was used as the pumping source. The guided modes of the pump were TE₀₀ and TM₀₀, and that of the second harmonic (SH) was TM₀₂. The phase‐matched thickness 2b of the glass film was 2.55 μm with an allowable tolerance of about 30 Å for an interaction length of 10 mm. The peak output power was 70 mW. The results were in agreement with theory.