Patent ID: 7545837
Filing Date: 2009-06-09
Classification: H01S,H04N

Abstract:
1. An transverse multiple mode laser comprising: a pumping light source; and a resonator including a laser medium and a wavelength conversion device, a nonlinear optical crystal or a nonlinear optical device which constitutes said wavelength conversion device being irradiated by a line beam obtained by exciting said laser medium in an elliptical transverse mode pattern to thereby obtain a one-dimensional output light line ray; and wherein said nonlinear optical device has a periodical poling structure, and both end faces of said nonlinear optical device have been processed to have roughly a Brewster's angle with respect to the incidence angle and emission angle of fundamental light, a reflector is provided at a position spaced from said nonlinear optical device; harmonic rays are generated in two directions having d33 phase matching, one harmonic ray is reflected by said reflector after outgoing from said nonlinear optical device and emits from an end face on an opposite side of said nonlinear optical device after being again incident on said nonlinear optical device, whereas the other harmonic ray emits from an end face of said nonlinear optical device located on the opposite side of said reflector, and an angular difference is provided between said harmonic rays so that said harmonic rays are not superimposed on each other.