Light source unit and fiber light source apparatus including the light source unit

A light source unit comprising:

• a housing;
• a semiconductor laser that is disposed in the housing and that radiates excitation light;
• a first condenser optical system that condenses the excitation light radiated from the semiconductor laser;
• a dichroic mirror that selectively reflects the excitation light transmitted through the first condenser optical system;
• a second condenser optical system that condenses the excitation light reflected by the dichroic mirror;
• a wavelength conversion member that performs wavelength conversion of the excitation light transmitted through the second condenser optical system and that emits wavelength-converted light;
• an emission section that outputs, to the outside of the housing, the wavelength-converted light emitted from the wavelength conversion member and transmitted through the second condenser optical system and the dichroic mirror;
• and
• a light blocking section that is disposed between an inner surface of the housing, the inner surface being in a traveling direction of the excitation light toward a reflection surface of the dichroic mirror, and a back surface, the back surface being an opposite side of the reflection surface, or is disposed on the inner surface of the housing.