OPTICAL WAVELENGTH CONVERSION ELEMENT AND PRODUCTION THEREOF

摘要

PURPOSE:To approximate the aspect ratio of the beams emitted from optical waveguides to 1 relating to the wavelength conversion element formed by using a nonlinear optical effect and the process for production thereof. CONSTITUTION:Polarity inversion layers 3 are formed on an LiTaO3 substrate 1. The optical waveguides 2 formed by a proton exchange method are formed thereon. The thickness of the exit part 5 of the optical waveguides 2 is larger than the thickness of the optical waveguides and the aspect ratio of the beam of the higher harmonic waves P2 emitted therefrom is nearly 1. The aspect ratio of the beam emitted therefrom is approximate to 1 and the efficiency of utilizing the beam is greatly improved.