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24 March 1999 Optical absorption and luminescence of LiTaO3:Cr and LiTaO3:Cr,Nd crystals
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Abstract
In this work we investigate spectroscopic properties of Cr3+ and Cr3+ - Nd3+ interaction in LiTaO3 using optical absorption, luminescence and luminescence decay times at temperatures between 5 K and 300 K. Some preliminary data obtained with singly doped LiTaO3:Cr at low activator concentration are given in our previous work. Recorded spectra indicate that both the Cr3+ and Nd3+ are located in several non- equivalent sites which differ in the strength of the crystal field. Luminescence spectrum of Cr3+ consists of a broad band whose maximum and intensity depend on temperature. Below about 50 K an additional sharp band with four distinct components appears in the spectrum. The broad band attributed to the spin allowed 4T2 - 4A2 transition of Cr3+ ions overlaps two absorption bands of Nd3+ ions at about 810 nm and 890 nm making the Cr3+ - Nd3+ energy transfer process feasible. Results of measurements are discussed and compared to those obtained with LiNbO3:Cr.
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Stanislaw Golab, I. Sokolska, Grazyna Dominiak-Dzik, M. N. Palatnikov, N. V. Sidorov, I. Biryukova, V. T. Kalinnikov, and Witold Ryba-Romanowski "Optical absorption and luminescence of LiTaO3:Cr and LiTaO3:Cr,Nd crystals", Proc. SPIE 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications, (24 March 1999); https://doi.org/10.1117/12.343003
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