24 March 1999 Growth and optical properties of chromium-doped LaGaO3 crystal
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Crystals of LaGaO3 were grown by the Czochralski method using seeds with different orientations. Crystal structure of LaGaO3 is orthorombic at room temperature and rhomohedral above 425 K. Owing to the phase transition the crystals are twinned and the density of twins depends on the seed quality and orientation as well as on purity of starting materials. Two boules of LaGaO3 containing 0.1 at% and 0.3 at% of Cr3+ were pulled using seeds with <112> orientation. Absorption and emission spectra are consistent with a strong crystal field case in which the 2E state is the lowest. At room temperature the luminescence consists of a broad vibronic band stretching from about 12700 cm-1 to 15000 cm-1. At low temperature the phonon side band disappears and two sharp R1 and R2 lines can be located. Additional sharp line in spectra has been attributed to the transition of coupled Cr3+ pairs.
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Witold Ryba-Romanowski, Witold Ryba-Romanowski, Stanislaw Golab, Stanislaw Golab, Grazyna Dominiak-Dzik, Grazyna Dominiak-Dzik, I. Sokolska, I. Sokolska, Marek Berkowski, Marek Berkowski, } "Growth and optical properties of chromium-doped LaGaO3 crystal", Proc. SPIE 3724, International Conference on Solid State Crystals '98: Single Crystal Growth, Characterization, and Applications, (24 March 1999); doi: 10.1117/12.343025; https://doi.org/10.1117/12.343025

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