To provide a method for producing a columnar glass body which has a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration; and a method for producing an optical fiber having a plurality of cores.
A columnar glass body which has a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration is produced as follows: a heavy ion in a thin beam state is implanted at a specified position in a long columnar glass body to form an area with a high heavy ion concentration; by successively changing the relative positions of an ion accelerator and the columnar glass body in the longitudinal direction of the columnar glass body, the heavy ion in a thin beam state is successively implanted into the columnar glass body to form an area continuing in the longitudinal direction and having a high heavy ion concentration; and the above operations are repeated at least twice at other positions in the columnar glass body to form a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration. An optical fiber having a plurality of cores is produced by subjecting the columnar glass body having a plurality of areas continuing in the longitudinal direction and having a high heavy ion concentration to a drawing treatment in the longitudinal direction.
COPYRIGHT: (C)2005,JPO&NCIPI
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高移動度のイオンをドープした耐放射線性ホウ酸塩系ガラスの構造特性とγ線照射効果,第12回東京大学原子力研究総合センターシンポジウム,2003年,344