The light source apparatus

The present invention provides a light source apparatus, the discharge vessel irradiated with laser light emission radiated by the discharge vessel by shielding reflected light illumination without reflected light reflected light unirradiated region from the ellipsoidal reflector is introduced into the laser so that radiation light unattenuated indeed reflected in the elliptical reflecting surface efficiently use the emitted light. The light source apparatus comprising: a light-emitting substance sealed within, is irradiated by a laser beam and an elliptical reflector (2) of the opening side of the condenser, and the radiation excited light-emitting substance emit light with a discharge vessel (1); with a focus placed in one discharge vessel (1) is an elliptical reflector (2); flat mirror and the emitted light is elliptical reflection mirror (2) reflected as a reflected light, change the reflection direction of the light (4), on a plane mirror (4) by the discharge capacitor (1) shield the reflected light from the ellipsoidal reflector (2) is not illuminated and reflected light reflected light unirradiated region provided with a window portion (41) into the laser beam (F1-F2).