Patent ID: 8915597

Claim:
A light source apparatus comprising: an excitation light source; a phosphor having, as a main wavelength region of fluorescence, wavelengths of green excited by excitation light emitted from the excitation light source; a red laser light source that oscillates in a red wavelength region; an optical multiplexer that multiplexes fluorescence emitted from the phosphor and red laser light emitted from the red laser light source; and color demultiplexing optics that demultiplexes, by using a cutoff wavelength, the light multiplexed by the optical multiplexer into two light beams, one light beam being a longer-wavelength side light beam, all components of the longer-wavelength side light beam have a wavelength longer than the cutoff wavelength of the color demultiplexing optics, and the other light beam being a shorter wavelength side light beam, all components of the shorter wavelength side light beam have a wavelength shorter than the cutoff wavelength of the color demultiplexing optics, wherein the cutoff wavelength of the color demultiplexing optics is shorter than the red wavelength region, and the longer-wavelength side light beam includes a longer-wavelength side component of the fluorescence whose wavelength is longer than the cutoff wavelength of the color demultiplexing optics.