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Proceedings Paper

Optical properties of laser spinel
Author(s): Nina Mironova-Ulmane; Vera Skvortsova; Andrejs Smirnovs; Daina Riekstinya; L. Litvinov; Ilmo Sildos; Andris Osvet
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Paper 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.).

Paper Details

Date Published: 4 February 1997
PDF: 6 pages
Proc. SPIE 2967, Optical Inorganic Dielectric Materials and Devices, (4 February 1997); doi: 10.1117/12.266540
Show Author Affiliations
Nina Mironova-Ulmane, Nuclear Research Ctr. (Latvia)
Vera Skvortsova, Nuclear Research Ctr. (Latvia)
Andrejs Smirnovs, Nuclear Research Ctr. (Latvia)
Daina Riekstinya, Nuclear Research Ctr. (Latvia)
L. Litvinov, Institute for Single Crystals (Ukraine)
Ilmo Sildos, Institute of Physics (Estonia)
Andris Osvet, Institute of Physics (Estonia)


Published in SPIE Proceedings Vol. 2967:
Optical Inorganic Dielectric Materials and Devices

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