| 摘要 |
A monomode optical fiber provided for transporting light having a wavelength lambd comprised between 480 and 550 nm. The fiber comprises a core made of a first transparent dielectric material, having a first refractive index nc and a substantially circular cross-section with a radius dimension a. The fiber further comprises a first cladding coaxially applied on said core and made of a second transparent dielectric material having a second refractive index nm1, wherein nm1<nc, The first transparent dielectric material consists in substantially pure silica, the second transparent dielectric material consists in doped silica, the thickness of the first cladding is comprised in a range of 5 to 15 mum, the values of nc and nm1 are chosen in such a manner that the numerical aperture (NA={square root over (nc2-n2m1) is less than 0.1 and the said radius dimension a is above 2 mum.
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