LIGHT SOURCE DEVICE AND PROJECTION DEVICE

摘要

Provided are: a light source device capable of more efficiently separating original excitation light and the illumination light created therefrom while simplifying the structure of an optical system to thus improve light use efficiency; and a projection device incorporating the light source device. The light source device comprises: a laser array 51 that is an excitation light source for emitting excitation light EL; an irradiated body 41 for emitting illumination light L2 containing fluorescent light FL upon receiving the excitation light EL; an illumination optical system for introducing the illumination light L2 emitted from the irradiated body 41; and a polarization splitter 32 disposed on the optical path between the excitation light source and the irradiated body and having a polarization separation surface 32a for separating the illumination light L2 from the optical path of the excitation light EL by transmission or reflection. The polarization splitter 32 is arranged so that the angle between the normal line to the polarization separation surface 32a and an optical axis SX of the illumination optical system is 50° or more and 80° or less.