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Proceedings Paper

UV-laser coloration and bleaching of unirradiated and gamma-irradiated silica glasses
Author(s): M. A. Kasymdzhanov; Pulat K. Khabibullaev; Saidiislam S. Kurbanov; Erkin A. Zakhidov
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Paper Abstract

UV-induced coloration and decreasing of the fast component's intensity of UV-excited luminescence in unirradiated silica glasses and UV-bleaching and decreasing of the fast component's intensity of the luminescence in gamma- irradiated silica glasses have been studied. In the experiments, unirradiated and irradiated by the gamma-ray dose 105 rad in 1987 high purity multicomponent silica glasses and N2-laser ((lambda) equals337 nm, (tau) approximately equal to 9 ns, repetition frequency 40 Hz, P approximately 6 MW/cm2) were used. The glasses had 5-6 eV band gap and less than 10-5 wt.% impurity concentration. During 20 min of laser irradiation the absorption coefficient of the unirradiated glasses at 337 nm is increased by 0,25 cm-1 and luminescence intensity was decreased by 35-40%. In gamma-irradiated silica glasses UV-irradiation leads to bleaching of gamma-induced coloration and decreasing of the intensity of UV-irradiation excited luminescence. After laser irradiation of the gamma- irradiated glasses during 20 min, their absorption coefficient at 337 nm is decreased by 0,13 cm-1 and the fast component's intensity is decreased by 30-40%. It should be pointed out, that both unirradiated and gamma- irradiated samples of glasses have the luminescence intensities of an equal value, but the absorption coefficients are different. These effects and luminescence time resolved spectra depend on the UV-irradiation intensity and are explained by the two photon absorption of laser irradiation in glasses.

Paper Details

Date Published: 12 April 2001
PDF: 10 pages
Proc. SPIE 4347, Laser-Induced Damage in Optical Materials: 2000, (12 April 2001); doi: 10.1117/12.425004
Show Author Affiliations
M. A. Kasymdzhanov, Uzbekistan Academy of Sciences (Uzbekistan)
Pulat K. Khabibullaev, Uzbekistan Academy of Sciences (Uzbekistan)
Saidiislam S. Kurbanov, Uzbekistan Academy of Sciences (Uzbekistan)
Erkin A. Zakhidov, Uzbekistan Academy of Sciences (Uzbekistan)

Published in SPIE Proceedings Vol. 4347:
Laser-Induced Damage in Optical Materials: 2000
Gregory J. Exarhos; Arthur H. Guenther; Mark R. Kozlowski; Keith L. Lewis; M. J. Soileau, Editor(s)

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