| 摘要 |
The present invention is to provide an optical fiber preform suitable for the production of an energy-transmitting or ultraviolet light-transmitting optical fiber, which has an excellent transmittance of a high-energy light of 50 KW/cm2 or more in terms of laser peak power or an ultraviolet light, to be transmitted through the optical fiber and which exhibits excellent durability that causes almost no deterioration by the irradiation with those two lights; and a production process thereof. The present invention relates to an energy-transmitting or ultraviolet light-transmitting optical fiber preform, having a core and a cladding each comprising a silica glass, wherein the core has an average OH concentration of 0 to 10 ppm, an average O2 concentration of <=1015 molecules/cm3, an average ODC (I) concentration of <=1013 defects/cm3, an average ODC (II) concentration of <=1012 defects/cm3 and an average F concentration of <=1,000 ppm, and the cladding has an average OH concentration of 0 to 10 ppm, an average F concentration of >=7,000 ppm, an average O2 concentration of <=1016 molecules/cm3, an average ODC (I) concentration of <=1013 defects/cm3 and an average ODC (II) concentration of <=1012 defects/cm3.
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