Patent ID: 6195198
Filing Date: 2001-02-27
Classification: G02F,H01S

Abstract:
An optical wavelength conversion system comprisingan optical wavelength conversion element having an optical waveguide which is formed on a ferroelectric crystal substrate having a nonlinear optical effect, and domain reversals which are periodically formed in the optical waveguide and arranged in a direction, the orientation of the spontaneous polarization of the substrate being reversed in the domain reversals and the optical wavelength conversion element being for converting the wavelength of a fundamental wave travelling in the direction of arrangement of the domain reversals under the guidance of the optical waveguide,a semiconductor laser which generates a laser beam which is caused to enter the optical wavelength conversion element as the fundamental wave,an optical splitting means which splits a part of the laser beam upstream of the optical wavelength conversion element,a mirror which reflects and feeds the split part of the laser beam back to the semiconductor laser, anda narrow band pass filter disposed in the optical path of the laser beam between the optical splitting means and the mirror.