Patent ID: 11868023
Assignee: PANASONIC HOLDINGS CORPORATION
Field: Optics (Instruments)
Classification: CPC G  H | IPC F  G

Claim 0:
1. A light-emitting device comprising:
an optical fiber including a light incident portion, a light emerging portion, and a wavelength converting portion, the wavelength converting portion being provided between the light incident portion and the light emerging portion and containing a wavelength converting material, the wavelength converting material being configured to be excited by excitation light to produce a spontaneous emission of light having a longer wavelength than the excitation light, the wavelength converting material being configured to amplify the spontaneous emission of light to produce an amplified spontaneous emission of light;
a first light source unit configured to emit the excitation light to the light incident portion; and
a second light source unit configured to emit seed light to the light incident portion, the seed light being light for causing a stimulated emission of light to be produced from the wavelength converting material that has been excited by either the excitation light or the amplified spontaneous emission of light, wherein:
the seed light is formed by a plurality of seed light rays, having mutually different wavelengths and the plurality of seed light rays are incident on the light incident portion,
a wavelength of the excitation light falls within the range from 440 to 450 nm, and
the wavelength converting material contains Pr3+ and Tb3+.