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TL spectra from optical fibres at 80 K after ultraviolet illumination
Author(s) -
Khanlary M. R.,
Townsend P. D.
Publication year - 1992
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221740128
Subject(s) - thermoluminescence , ultraviolet , irradiation , materials science , spectral line , optical fiber , dopant , optical spectra , optics , ultraviolet radiation , optoelectronics , analytical chemistry (journal) , chemistry , luminescence , radiochemistry , doping , physics , astronomy , chromatography , nuclear physics
Emission spectra of thermoluminescence below room temperature are reported from several types of optical fibre after ultraviolet illumination at 80 K. The spectra are modified by previous X‐ray irradiation at room temperature. Since the light energy is insufficient to form new intrinsic defects all the signals are thought to arise from phototransfer from deep stable defect states formed during fibre production. An X‐ray irradiation history at 300 K, before cooling to 70 K, significantly enhances subsequent optically generated glow peaks, in particular that at 120 K which emits at 545 nm. The phototransfer efficiency of the fibres is greater than for “pure” bulk silica. It is therefore proposed that the high phototransfer efficiency found in the optical fibres is related to a combination of the fibre dopants and defect retention during the rapid cooling used in fibre drawing.