Vienne, G.G., Brocklesby, W.S., Brown, R.S., Chen, Z.J., Minelly, J.D. and Payne, D.N.
Role of aluminium in ytterbium-erbium codoped phosphoaluminosilicate optical fibres
Optical Fiber Technology, 2, (4), . (doi:10.1006/ofte.1996.0044).
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We report on a series of ytterbium - erbium codoped aluminophosphosilicate fibres fabricated by the MCVD and solution doping technique where the concentration of aluminium is gradually increased in the region [Al] < [P]. We observe from deflection measurements that with increasing aluminium content the refractive index decreases and the phase separation increases. Laser slope efficiencies decrease when the aluminium concentration approaches the phosphorus concentration and the trend is seen to be correlated with the reduction in energy transfer rate when the aluminium concentration is increased. Raman spectra show the reduction of the highest phonon energy peak when the aluminium content is increased. The erbium 4 I (13/2) to 4 I (15/2) transition fluorescence spectrum and the lifetime of the erbium 4S(3/2) level show little change from the pure phosphosilicate host for the whole range of aluminium concentrations tested. The results are explained in term of formation of AlPO4 structural units.
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