Light source device having optical members for changing one or more characteristics of excitation light from an excitation light source

A light source device comprising:

• a first excitation light source configured to emit first excitation light having a wavelength in a first wavelength region;
• a first optical member configured to absorb at least part of the first excitation light, convert a wavelength of the part of the first excitation light to emit first wavelength converted light, and increase a divergence angle of transmitted first excitation light by a first incremental angle;
• a second optical member configured to increase the divergence angle of the transmitted first excitation light by a second incremental angle larger than the first incremental angle;
• and
• a holding member which holds the first optical member and the second optical member, wherein
• the holding member comprises an incidence portion through which the first excitation light enters, and an emission portion which emits the first wavelength converted light,
• the first optical member and the second optical member are arranged to divide a surface perpendicular to an optical axis of the first excitation light which enters through the incidence portion, and
• the second optical member is disposed on the optical axis of the first excitation light and the first optical member is not disposed on the optical axis of the first excitation light.

A light source device comprising:

• a first excitation light source configured to emit first excitation light having a wavelength in a first wavelength region;
• a first optical member configured to absorb at least part of the first excitation light, convert a wavelength of the part of the first excitation light to emit first wavelength converted light, and increase a divergence angle of transmitted first excitation light by a first incremental angle;
• a second optical member configured to increase the divergence angle of the transmitted first excitation light by a second incremental angle larger than the first incremental angle;
• a holding member which holds the first optical member and the second optical member;
• and
• a second excitation light source configured to emit second excitation light having a wavelength in a second wavelength region, wherein
• the second optical member is configured to absorb at least part of the second excitation light, and convert the wavelength of the second excitation light to emit the second wavelength converted light,
• the first excitation light and the second excitation light are combined by an optical coupler,
• the holding member comprises an incidence portion through which the first excitation light and the second excitation light that have been combined enter, and an emission portion which emits the first excitation light, the second excitation light, the first wavelength converted light, and the second wavelength converted light, and
• an optical axis of the first excitation light entering through the incidence portion corresponds to an optical axis of the second excitation light.