Abbreviated Journal Title
Opt. Mater. Express
IONS; FABRICATION; GLASSES; Materials Science, Multidisciplinary; Optics
Europium doped alkaline earth fluoride [Eu:AEF(2) (AE = Ca, Sr, Ba)] nanoparticles were synthesized and systematically incorporated into the core of modified chemical vapor deposition (MCVD)-derived silica-based preforms by solution doping. The resulting preforms were examined to determine the impact of the nanoparticles chemistry on the spectroscopic behavior of the glass. The dominant existence of Eu3+ was demonstrated in all preforms, which is in contrast to conventional solution doped preforms employing dissolved europium salts where Eu2+ is primarily observed. Raman spectroscopy and fluorescence lifetime measurements indicated that the nanoparticles composition is effective in controlling, at a local chemical and structural level, the spectroscopic properties of active dopants in optical fiber glasses. Further, there is a systematic and marked increase in radiative lifetime, tau, of the Eu3+ emission that follows the cationic mass; tau(Ca) < tau(Sr) < tau(Ba) with the BaF2-derived sample yielding a 37% lengthening of the lifetime over the CaF2-derived one. Such nanoscale control of what otherwise is silica glass could be useful for realizing property-enhanced and tailored spectroscopic performance from otherwise "standard" materials, e.g., vapor-derived silica, in next generation optical fibers.
Optical Materials Express
Lindstrom, T.; Garber, E.; Edmonson, D.; Hawkins, T.; Chen, Y.; Turri, G.; Bass, M.; and Ballato, J., "Spectral engineering of optical fiber preforms through active nanoparticle doping" (2012). Faculty Bibliography 2010s. 2944.