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Spectra of Selective Radiation of Al2O3 : Ti3+ under Laser-Thermal Heating

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Abstract

In this Letter, we experimentally study the temperature dependence of the thermal radiation spectra of an Al2O3 : Ti3+ single crystal in the visible and near-infrared regions of the spectrum under laser-thermal heating. The thermal spectra of Al2O3 : Ti3+ in the temperature range of T = 330–900 K were found to differ significantly from the blackbody radiation spectrum and to be selective with a maximum at λ ≈ 1060 nm. The conversion of thermal energy into electrical energy due to the photovoltaic conversion of the selective radiation of a heated Al2O3 : Ti3+ single crystal by silicon photodiodes of the spectrometer receiving line was demonstrated. The possibility of applying the effect in thermovoltaic electric generators is discussed.

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ACKNOWLEDGMENTS

We are grateful to A.P. Mineev and S.M. Nefedova for providing experimental equipment and assistance in performing experiments.

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Correspondence to V. M. Marchenko.

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Translated by A. Ivanov

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Marchenko, V.M., Kazantsev, S.Y. & Kiselev, V.V. Spectra of Selective Radiation of Al2O3 : Ti3+ under Laser-Thermal Heating. Tech. Phys. Lett. 46, 242–244 (2020). https://doi.org/10.1134/S1063785020030098

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