Patent ID: 8254421

Claim:
A wavelength conversion laser light source comprising: a fundamental wave laser light source; a wavelength conversion element for converting a fundamental wave laser beam emitted from the fundamental wave laser light source into a harmonic wave; and an element temperature holding section for holding the wavelength conversion element at a temperature as set, two reflective surfaces for reflecting therefrom the fundamental wave laser beam; and condensing optics for condensing the fundamental wave laser beam to be injected between said two reflective surfaces, wherein the element temperature holding section includes a magnetic metal formed on at least a part of the surface of the wavelength conversion element via an insulating material, and a magnetic flux application section for heating the magnetic metal with an application of a magnetic flux to the magnetic metal, wherein at least one of said two reflective surfaces has a curvature for reflecting the fundamental wave laser beam to be re-injected into the wavelength conversion element between said two reflective surfaces repeatedly while forming multi paths of the fundamental wave laser beam injected into the wavelength conversion element at different incident angles, and wherein said condensing optics are arranged to disperse beam waists of the fundamental wave laser beam in the wavelength conversion element, which reciprocate between said two reflective surfaces.