X-ray-induced photochromic effects in copper-doped lithium niobate crystals

X-Ray-induced absorption changes in Cu-doped lithium niobate crystals (LiNbO3) are investigated. All induced photochromic effects are fully reversible, i.e., illumination with white light annihilates the absorption changes. With increasing doping level, a decrease in the saturation value of the abso...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2001-05, Vol.72 (6), p.729-732
Main Authors: Berben, D., Andreas, B., Buse, K.
Format: Article
Language:English
Subjects:
Composition effects
Concentration (composition)
Copper
Crystals
Lithium niobates
Saturation
Spectra
White light
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Summary:X-Ray-induced absorption changes in Cu-doped lithium niobate crystals (LiNbO3) are investigated. All induced photochromic effects are fully reversible, i.e., illumination with white light annihilates the absorption changes. With increasing doping level, a decrease in the saturation value of the absorption changes is found. Changes of the Li concentration of the crystal to a more stoichiometric composition via Li indiffusion further decreases the photochromic effect. For sufficient X-ray doses, the saturation value is independent of the radiation energy in the measured range from 50--150 kV. The spectral distribution of the X-ray-induced absorption changes and the slow dark decay indicate that the additional absorption results from an increase of the Cu concentration.
ISSN:0946-2171
1432-0649
DOI:10.1007/s003400100558