Patent ID: 8705912
Filing Date: 2014-04-22
Classification: G02B,H01S

Abstract:
1. A light source apparatus comprising: a first light source unit that outputs single-mode light with a main output wavelength λ an amplifier configured to amplify output light from light source; and a delivery optical fiber into which the output light from the first light source unit is inputted, after the output light is amplified, wherein the delivery optical fiber has a photonic bandgap structure in a core-surrounding portion located around a core thereof, the delivery optical fiber having, in the core, a first wavelength band having a first loss value that is substantially constant throughout the first wavelength band and a second wavelength band having a second loss value higher than the first loss value in the first wavelength band, as power transfer loss characteristics according to change in a longitudinal direction of an output light propagating region in a fiber cross section, wherein the wavelength λ wherein a bending state of the delivery optical fiber is set so that the light with the wavelength λ