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Optical spectroscopy of the Er³⁺ ions in BaY_1,8Lu_0,2F₈ crystals

DOI: 10.61011/EOS.2023.05.56504.61-22

Astrakhantseva A. V.¹, Shavelev A. A.¹, Kuznetsov S. V.², Nikolaev A. G.³, Boldyrev K. N.⁴, Nizamutdinov A. S.¹, Semashko V. V.^1,5

¹Kazan Federal University, Kazan, Tatarstan, Russia
²Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
³Kazan Federal University, Institute of Geology and Oil and Gas Technologies, Kazan, Russia
⁴Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
⁵Zavoisky Physical-Technical Institute (ZPhTI) of the Kazan Scientific Center of the Russian Academy of Sciences, Kazan, Tatarstan, Russia

Email: anya4324@gmail.com

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Abstract
References
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The spectral and kinetic characteristics of Er³⁺ ions in heavily doped BaY_1.8Lu_0.2F₈ mixed crystals have been studied. Absorption and luminescence spectra were recorded for BaY_1.8Lu_0.2F₈ crystals with Er³⁺ ion concentrations of 20.0 and 30.0 at.%. The kinetic dependences of luminescence decay in the infrared range have also been studied. A model of the level populations of Er³⁺ ions is constructed on the basis of a three-level scheme for pumping the ^4I_11/2 state at a wavelength of 970 nm without taking into account up-conversion processes. The gain of BaY_1.8Lu_0.2F₈ crystals with Er³⁺ ion concentrations of 20.0 and 30.0 at.% is estimated at different pump powers. Keywords: population inversion, gain coefficient, modeling, fluorides. DOI: 10.61011/EOS.2023.05.56504.61-22

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