Light source apparatus, illuminator, and projector

A light source apparatus comprising:

• a first light source configured to output first light having a first wavelength band;
• a wavelength converter configured to convert the first light into second light having a second wavelength band different from the first wavelength band;
• a second light source configured to output third light having a third wavelength band;
• a light guide disposed between the first light source and the wavelength converter and configured to guide each of the first light, the second light, and the third light;
• and
• a controller configured to control a state in which the second light source outputs the third light,
• wherein the wavelength converter has a first surface and a second surface that face each other in opposite directions, and a third surface that intersects with the first surface and the second surface,
• the first light output from the first light source enters the wavelength converter through the third surface via the light guide,
• the second light travels through the light guide and exits out of a region on the first surface side of the light guide,
• the third light includes fourth light in a first polarization state, and fifth light in a second polarization state different from the first polarization state, and enters a region on the second surface side of the light guide,
• the second light source includes a first light emitting section configured to emit the fourth light and a second light emitting section configured to emit the fifth light,
• the first light emitting section and the second light emitting section each include a laser diode, and
• the controller is configured to temporally change a ratio between an amount of the fourth light emitted from the first light emitting section and an amount of the fifth light emitted from the second light emitting section.