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Proceedings Paper

Light-induced absorption of Ru-doped Bi12TiO20 crystals
Author(s): S. Piquette; Vera Marinova; Shiuan Huei Lin; Ken Yuh Hsu
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Paper Abstract

The effect of ruthenium doping on optical properites of Bi12TiO20 (BTO) single crystals is studied. A low concentration of ruthernium does not change absorption behavior of BTO, however higher ruthenium addition significantly shifts the optical absorption to the near infrared spectral region with an absorption shoulder appearing around 1.8 eV. The absorption coefficient increases with increasing the Ru concentration. Light-induced absorption changes are observed and the dynamics of build-up and dark decay processes are investigated. Results show that concentration of shallow levels increase with Ru content. Evolution of the build-up and dark decay of light induced absorption consists of fast and slow components: the first process occurs within few seconds, while the second one needs several hours (or days). It is established that light-induced absorption can be modified by preliminary illumination and thermal treatments thus multi-level lead to the transient and persistent parts of light-induced absorption. A model, assuming one deep and two shalow levels is proposed to explain the bi-exponential behavior of the build-up and the dark decay of light-induced absorption when the crystals are preliminary annealed in oxygen atmosphere.

Paper Details

Date Published: 15 December 2003
PDF: 8 pages
Proc. SPIE 5260, Applications of Photonic Technology 6, (15 December 2003); doi: 10.1117/12.543406
Show Author Affiliations
S. Piquette, National Chiao Tung Univ. (Taiwan)
Vera Marinova, National Chiao Tung Univ. (Taiwan)
Shiuan Huei Lin, National Chiao Tung Univ. (Taiwan)
Ken Yuh Hsu, National Chiao Tung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 5260:
Applications of Photonic Technology 6
Roger A. Lessard; George A. Lampropoulos, Editor(s)

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