Bi-doped glasses for broadband fiber light source

摘要

Bi-doped silica glass is a new broadband infrared fluorescence material. We drew optical fibers with the Bi doped silicaglass for the fiber core and evaluated the fluorescence spectrum. The FWHM of fluorescence spectrum is measured to be390 nm. When this broad band spectrum is used as an OCT light source, the expected axial resolution is calculated to be1.9um, This is comparable to the axial resolution (Az—li.tm) by Ti:Al2O3 system. And we also examined the localstructure of Bi ion in Bi-doped silica glass. These are analyzed by ESR, EXAFS, XPS, and 27A1-NMR. According tothese results, the structural model of Bi luminescent center is proposed that Bi5 ion with 6-fold coordination exists closeto A1~3+ion with 6-fold coordination.