Optical properties of laser spinel

Nina Mironova-Ulmane; Vera Skvortsova; Andrejs Smirnovs; Daina Riekstinya; L. Litvinov; Ilmo Sildos; Andris Osvet

doi:10.1117/12.266540

4 February 1997 Optical properties of laser spinel

Nina Mironova-Ulmane, Vera Skvortsova, Andrejs Smirnovs, Daina Riekstinya, L. Litvinov, Ilmo Sildos, Andris Osvet

Proceedings Volume 2967, Optical Inorganic Dielectric Materials and Devices; (1997) https://doi.org/10.1117/12.266540
Event: International Conference on Advanced Optical Materials and Devices, 1996, Riga, Latvia

Abstract

The present work summarizes the results of absorption and luminescence spectra investigation of natural and synthetic magnesium aluminum spinels (MgO*nAl₂O₃) containing chromium and manganese ions. The spectra have been analyzed with an aim to determine the effect of stoichiometry 'n' on distribution of emitting ions. The Mn²⁺ is observed in both tetrahedral and octahedral coordinations providing green or orange emission. Absorption bands have been explained in terms of the Mn²⁺ configuration model. Laser excitation of chromium-comprising magnesium aluminum spinel crystals has been carried out at 7 K with the purpose to detect the nearest neighbors of Cr³⁺ ions. Luminescence emission spectra have been obtained for natural sample and three synthetic samples (MgO*nAl₂O₃, n equals 1, 2, 2.8). Decay time has been measured at different wavelengths and compared for crystals of different stoichiometry. In case n equals 2 or 2.8, computer simulation has been used to decompose smeared luminescence spectra in the 680 - 700 nm region. Gaussian curves corresponding to R- and N-lines of natural spinel spectrum have been applied as components in the calculations of nonstoichiometric spinel spectra. This suggests that there aren't normally arranged Cr-occupied octahedral positions in nonstoichiometric spinel (n equals 2.8, e.g.).

Citation Download Citation

Nina Mironova-Ulmane, Vera Skvortsova, Andrejs Smirnovs, Daina Riekstinya, L. Litvinov, Ilmo Sildos, and Andris Osvet "Optical properties of laser spinel", Proc. SPIE 2967, Optical Inorganic Dielectric Materials and Devices, (4 February 1997); https://doi.org/10.1117/12.266540

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