| 简介 |
PROBLEM TO BE SOLVED : To provide a light-emitting device which can extend a color tone range, a laser display, and an endoscope.
SOLUTION : In the light-emitting device provided with a light source 1 and an optical fiber 2 which spreads light from the light source 1, the light source 1 has an emission peak wavelength in a less than 500 nm wavelength region, and the optical fiber 2 is doped with two or more sorts of rare-earth elements, which are excited by the light from the light source 1 to emit light, and makes light from the rare-earth elements outgo without laser oscillation.
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