Patent ID: 6836497
Filing Date: 2004-12-28
Classification: G02F,H01S

Abstract:
A semiconductor laser module comprising:an optical wavelength conversion element comprising: a ferroelectric crystal substrate, and a transverse electric (TE) mode optical waveguide which extends along the ferroelectric crystal substrate surface, said optical waveguide having a polarization direction parallel to the ferroelectric crystal substrate, and said optical waveguide further having a periodic domain inversion portion, where a spontaneous polarization direction of the ferroelectric crystal substrate is inverted, and the optical wavelength conversion element converts a wavelength of a fundamental wave which propagates in the optical waveguide in a direction along which the domain inversion portions are aligned; and a semiconductor laser which can emit a laser beam in the TE mode in which a laser polarization direction is parallel to the ferroelectric crystal substrate and which can adjust a center wavelength of stimulated emission of the laser beam, and light emitted from the semiconductor laser is made to enter the optical waveguide, wherein said optical wavelength conversion element and said semiconductor laser are mounted such that the polarization directions of the TE mode of the waveguide and laser coincide with each other and a light exit portion of the semiconductor laser and a light entrance portion of the optical wavelength conversion element coincide with each other, wherein the spontaneous polarization direction of said substrate forms a predetermined angle with respect to the substrate surface in a plane perpendicular to a propagation direction of the fundamental wave, and wherein the light exit portion of said semiconductor laser and the light entrance portion of said optical wavelength conversion element are bonded together with a thin film insulator interposed therebetween.