Patent ID: 8356924

Claim:
A light source apparatus comprising: a light source which emits excitation light; an optical fiber which is optically connected to the light source, and which guides the excitation light; a wavelength converting member which is optically connected to an emitting end portion of the optical fiber, and which receives the excitation light emitted from the emitting end portion, and makes emerge light of a wavelength area different from a wavelength area of the excitation light; and a holding member which holds the emitting end portion of the optical fiber, a light diverging unit, and the wave length converting member, wherein the light source apparatus has the light diverging unit which is arranged in an optical path of the excitation light, between the emitting end portion of the optical fiber and the wavelength converting member, and the holding member comprises: a first internal space between the emitting end portion of the optical fiber and the light diverging unit, and a second internal space between the light diverging unit and the wavelength converting member; wherein the light diverging unit is a plurality of light diverging optical elements formed on a plate member, the plurality of light diverging optical elements formed on the plate member is a concavo-convex surface formed on a surface of the plate member and the concavo-convex surface is disposed at random such that a distance between the convex portion and an adjacent convex portion is not more than 100 microns.