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1 1999

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Optical absorption and luminescence of LiTaO₃:Cr and LiTaO₃:Cr, Nd crystals

Gołąb S., Sokólska I., Dominiak-Dzik G., Palatnikov M. N., Sidorov N. V., Biryukova I., Kalinnikov V. T., Ryba-Romanowski W.

Opto-Electronics Review

1999

Vol. 7, No. 2

145-147

The interest in LiNbO₃ and LiTaO₃ crystals doped with transition metal or rare eartch ions is related to their potential applications as self-switching and self-frequency doubling laser materials. In the past considerable attention has been paid to LiNbO₃ crystals doped by variety of luminescent ions. In particular LiNbO₃:Cr was investigated recently by Macfarlane et al. [1]. Energy transfer between Cr³⁺ and Nd³⁺ in LiNbO₃ has been studied and discussed by Vergara et al. [2]. 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 [3]. Recorded spectra indicate that both the Cr³⁺ and Nd³⁺ are located in several non - equivalent sites that 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.