Patent ID: 7769061
Filing Date: 2010-08-03
Classification: G02F,H01S

Abstract:
1. A laser light source device comprising: a laser light source that emits a plurality of laser beams as fundamental waves; an optical wavelength conversion element that converts the fundamental waves into second harmonics, the optical wavelength conversion element having a polarization inversion structure; and an optical lens system including a plurality of lenses, each lens having a first surface having positive power and a second surface having negative power, the optical lens system being arranged between the laser light source and the optical wavelength conversion element, the first surfaces and the second surfaces of each of the lenses arranged in order from the laser light source side, the lenses each being immediately adjacent to the optical wavelength conversion element and having an overall convex characteristic such that light exiting the second surface of the optical lens system converges faster than light entering the first surface of the optical lens system; and a mirror that transmits the second harmonic and reflects excitation light, the wavelength conversion element and the mirror arranged in order from the laser light source side, wherein the first surfaces have a first curvature and the second surfaces have a second curvature, the first curvature being larger than the second curvature, and each lens of the optical lens system corresponds to a single one of the plurality of laser beams.