The optical fiber illuminant which is based on third harmonic

摘要

The illuminant which generates light through the occurrence of third harmonic, designates the optical fiber as the base. The illuminant has the pump illuminant which supplies the pump light which possesses the basic mode of wave length _P. In addition, the illuminant has the optical fiber which is connected to the pump illuminant optically. The central territory and the (ii) central territory where refractive index profile of the optical fiber core has (i) relative refractive index value ₁ are directly encircled, the 1st annular territory, and the (iii) 1st annular territory which possess relative refractive index value ₂ are directly encircled, the 2nd annular territory which possesses relative refractive index value ₃ has possessed. The optical fiber, condition ₂ 1, ₂ 3, and maximum { ₁, ₃} satisfies 21.2%. Due to pump light, wave length _TH= (1/3) the third harmonic light which possesses the higher mode _P occurs and radiation is done from the radiation edge of the optical fiber. Basic mode of pump light and higher mode of third harmonic light you can obtain the conversion efficiency of 1% or more by overlapping over the length of the optical fiber.