Investigation of photo-induced absorption in a Bi12TiO20 crystal |
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| Authors: | A Matusevich A Tolstik M Kisteneva S Shandarov V Matusevich A Kiessling and R Kowarschik |
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| Institution: | (1) Physical Faculty, Belarusian State University, Prosp. Nezavisimosti 4, 220030 Minsk, Belarus;(2) Department of Electronic Devices, State University of Control Systems and Radioelectronics, Prosp. Lenina 40, 634050 Tomks, Russia;(3) Institute of Applied Optics, Friedrich-Schiller-University, Max-Wien-Platz 1, 07743 Jena, Germany |
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| Abstract: | A photorefractive Bi12TiO20 (BTO) crystal is exposed with high intensity pulsed-laser beams 532 nm (the average intensity of the laser was 110 mW/cm2, the average intensity per pulse was 2 MW/cm2), and the photo-induced dynamics of the absorption between 480 and 900 nm are studied and explained by two long-lived energy
levels in the forbidden band. The relaxation times of the long-lived energy levels are experimentally found to be 104 and 105 s. The hysteresis character of the absorption coefficient is discussed.
PACS 42.70.Mp; 42.70.Gi |
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