Patent ID: 7912102
Filing Date: 2011-03-22
Classification: H01S

Abstract:
1. A solid-state laser generator for performing wavelength conversion in two or more stages inside a resonator, the generator comprising: a first resonator for a fundamental wavelength, composed of first and second flat mirrors; a third flat mirror disposed between said first and second flat mirrors; a fourth flat or curved mirror disposed outside of said first resonator; a second resonator for the wavelength-converted laser light, composed of said second flat mirror or said third flat mirror and said fourth flat or curved mirror, said first resonator and said second resonator being superimposed on the same optical axis; a laser medium for amplifying laser light of the fundamental wavelength, disposed between said first and third flat mirrors; and a first nonlinear optical crystal for converting the wavelength of laser light of said fundamental wavelength, at least one second nonlinear optical crystal for carrying out higher order wavelength conversion of laser light whose wavelength has been converted by said first nonlinear optical crystal, and a first lens, disposed between said third and second flat mirrors; the spacing between said first lens and said second flat mirror being equal to the focal distance f of said first lens; wherein n (n is a natural number) pairs of lenses are disposed between said third flat mirror and said second flat mirror, one or all of said at least two or more nonlinear optical crystals are disposed between two lenses that constitute said pair of lenses, and the spacing between said lens and one or all of said at least two or more nonlinear optical crystals is equal to the focal distance f of said lens.