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Laser-induced refractive index gratings formed in Pr3+-doped sodium-magnesium-aluminosilicate glasses

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2 Author(s)
Hamad, Abdulatif Y. ; Department of Physics, Southern Illinois University, Edwardsville, Illinois 62026-1654 ; Wicksted, J.P.

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We report a systematic study of grating formation in which the Pr2O3 concentration [Pr2O3] in sodium-magnesium-aluminosilicate glasses is varied from 0.5 to 5 mol %. The grating kinetics is reported as functions of the [Pr2O3] and the write-beam irradiance. The maximum persistent change in the index of refraction was 1×10-5. The persistent change in the index of refraction initially decreased linearly as a function of the [Pr2O3] and showed a limiting behavior at the highest [Pr2O3]. No appreciable transient change in the index of refraction, Δntran, was measured. This was attributed to the low probability of the multiphonon relaxation of the 3P0 level of the Pr3+ ions as determined through fluorescence measurements. The results of this study are consistent with a recently developed small modifier diffusion model.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 6 )