To provide a light source apparatus that can be miniaturized and made inexpensive by allowing one wavelength conversion element to correspond to an array of emitters, and to provide a projector and a monitoring device.
The light source apparatus 100 includes: a light element 1 having a plurality of rows of emitters A1, A2 where emitters 2 for emitting laser beams are arranged in a line; the wavelength conversion element 20 arranged on an optical path of laser beams emitted from the emitters 2 of the light element 1; an external resonator 30 for composing a resonator structure with the light element 1; a half-transparent reflection mirror M that is provided on the optical path of laser beams between the light element 2 and the wavelength conversion element 20, transmits laser beams emitted from the light element 1, and reflects laser beams that are reflected by the external resonator 30 and of which the wavelength is converted by the wavelength conversion element 20; and an optical member M3 for further reflecting the laser beams reflected by the half-transparent reflection mirror M for emitting to the outside.
Masatake Shiga
Kazunori Onami