a1 Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
a2 Kinki University, School of Science and Engineering, Department of Electric and Electronic Engineering, Higashi-Osaka 577-8502, Japan
a3 Institute of Laser Engineering, Osaka University, Suita, Osaka 565-0871, Japan
We observed the enhancement of fluorescence intensity due to the addition of GeO2 in bismuth-doped silica glass (BiSG), which has a peculiar fluorescence at 1.25 μm with a full width at half-maximum of 300 nm. Experimental results revealed that the fluorescence intensity from BiSG with 5.0 mol% GeO2 increased remarkably to be 26.3 times greater than that without GeO2 additive for the same Bi2O3 concentration (0.1 mol%). Furthermore, the enhanced sample showed almost the same intensity as BiSG without GeO2 for 1.0 mol% Bi2O3. These results demonstrate that GeO2 additive effectively promotes the generation of peculiar luminescent centers.
(Received September 27 2006)
(Accepted December 12 2006)