Patent ID: 9696568
Date: 2017-07-04
CPC Classifications: G01J,G01N,G02B,G02F,H01S

Claim:
1. A light source apparatus comprising: a first laser light source that generates a first fundamental light beam; a second laser light source that generates a second fundamental light beam, the second fundamental light beam having a wavelength different from that of the first fundamental light beam; an at least one nonlinear optical crystal that generates a wavelength converted light beam by sum-frequency mixing, the sum frequency mixing using the first fundamental light beam and a harmonic light beam of the second fundamental light beam as incident light beams; a detector that detects the wavelength converted light beam; an acousto-optic modulator that is disposed in an optical path between the first laser light source and the nonlinear optical crystal or an optical path between the second laser light source and the nonlinear optical crystal, the acousto-optic modulator being disposed in such a way that a zero-order light beam enters the nonlinear optical crystal; a coupling mirror that is disposed in an optical path between the acousto-optic modulator and the nonlinear optical crystal and is disposed in such a way that the harmonic laser beam of the second fundamental light beam will become coaxial with the first fundamental light beam; and a controller configured to output a control signal that changes a diffraction efficiency of the acousto-optic modulator and to control an output intensity of the wavelength converted light beam according to a detection signal from the detector.