Title :
Quantum-efficiency of praseodymium doped Ga:La:S glass for 1.3 /spl mu/m optical fibre amplifiers
Author :
Hewak, D.W. ; Neto, J. A Medeiros ; Samson, B. ; Brown, R.S. ; Jedrzejewski, K.P. ; Wang, J. ; Taylor, E. ; Laming, R.I. ; WYLANGOWSKI, G. ; Payne, D.N.
Author_Institution :
Optoelectron. Res. Centre, Southampton Univ., UK
fDate :
5/1/1994 12:00:00 AM
Abstract :
The gain of Pr/sup 3+/-doped ZBLAN fibre amplifiers is hindered by a poor quantum efficiency due mainly to a high rate of multiphonon decay. Sulphide-based glasses ameliorate this problem through a higher radiative rate and lower nonradiative rate. In this letter, Pr/sup 3+/-doped Ga:La:S glass has been evaluated spectroscopically in bulk and fibre form for its quantum-efficiency at 1.3 microns. Measurements reveal that absorption bands are broadened and the effective separation between the /sup 1/G/sub 4/ and /sup 3/F/sub 4/ level is reduced compared to ZBLAN glass. Judd-Ofelt analysis and the theory of multiphonon-decay now predict efficiencies of 80%, while 58% is measured. Oxide impurities are shown to play a key role in quenching of the radiative emission.<>
Keywords :
chalcogenide glasses; fibre lasers; gallium compounds; lanthanum compounds; nonradiative transitions; optical glass; phonon-phonon interactions; praseodymium; radiation quenching; 1.3 micron; 58 percent; 80 percent; GaLaS:Pr; Judd-Ofelt analysis; Pr/sup 3+/-doped Ga:La:S glass; absorption bands; gain; multiphonon decay; nonradiative rate; optical fibre amplifiers; oxide impurities; quantum-efficiency; quenching; radiative emission; spectroscopy; Absorption; Crystallization; Energy states; Glass; Optical fiber amplifiers; Optical fiber theory; Optical fibers; Semiconductor optical amplifiers; Spectroscopy; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
