Enhanced photosensitivity in germanosilicate fibers exposed to CO2 laser radiation

被引：19

作者：

Brambilla, G ^{[1
]}

Pruneri, V ^{[1
]}

Reekie, L ^{[1
]}

Payne, DN ^{[1
]}

机构：

[1] Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England

来源：

OPTICS LETTERS | 1999年 / 24卷 / 15期

关键词：

D O I：

10.1364/OL.24.001023

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report a novel method to increase the UV photosensitivity of GeO2:SiO2 optical fibers based on exposure to CO2 laser irradiation before grating writing. Fibers treated with a CO2 laser can produce gratings with refractive-index modulation two times greater and a Bragg wavelength that can be 2 nm longer than those of untreated fibers. Experiments on GeO2:SiO2 preform samples treated with a CO2 laser in a way similar to the fibers showed a marked increase of the 242-nm absorption band, which is associated with an increase of germanium oxygen-deficient centers and is believed to be responsible for the higher photorefractive response. (C) 1999 Optical Society of America.

引用

页码：1023 / 1025

页数：3