Patent ID: 7738162
Filing Date: 2010-06-15
Classification: G02F

Abstract:
1. A short wavelength light source, comprising: a fundamental wave light source for generating a fundamental wave; and a plurality of wavelength conversion elements made of nonlinear optical crystals having periodic polarization-inversion structures and adapted to convert a part of the fundamental wave into a second harmonic, said plurality of wavelength conversion elements including a first wavelength conversion element made of a first nonlinear optical crystal having a periodic polarization-inversion structure and adapted to convert a part of the fundamental wave from the fundamental wave light source into the second harmonic and a second wavelength conversion element made of a second nonlinear optical crystal having a periodic polarization-inversion structure and adapted to convert a part of the fundamental wave from the first wavelength conversion element into the second harmonic, wherein the nonlinear optical crystals of the plurality of wavelength conversion elements are different in material or composition.