Photochromism of doped terbium gallium garnet

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H. Dachraoui,¹ R. A. Rupp,¹ K. Lengyel,² M. A. Ellabban,¹ M. Fally,¹ G. Corradi,² L. Kovács,² and L. Ackermann³
¹Faculty of Physics, Nonlinear Physics Group, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria*
²Research Institute of Solid State Physics and Optics, Hungarian Academy of Sciences, Konkoly-Thege M. út 29-33, H-1121 Budapest, Hungary
³Forschungsinstitut für Mineralische und Metallische Werkstoffe, D-55743 Idar-Oberstein, Germany

Received 21 July 2006; published 18 October 2006

Inorder to understand the photochromic effect in terbium gallium garnetdoubly doped with calcium and cerium, the spectral characteristics ofabsorption changes induced by heating and irradiation are studied. Basedon the findings we conclude that the photochromic band at420 nm originates from defects involving Tb⁴⁺. Previously the band wasattributed to Ce³⁺. Two possible models are suggested and discussed,both of which are in agreement with the obtained experimentalresults.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.144104
DOI:	10.1103/PhysRevB.74.144104
PACS:	78.40.-q; 42.70.Nq 78.40.-q Absorption and reflection spectra: visible and ultraviolet (condensed matter) 42.70.Nq Other nonlinear optical materials; photorefractive and semiconductor materials YEAR: 2006
KEYWORDS:	terbium compounds, garnets, photochromism, calcium, cerium, heat treatment, visible spectra

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