The 18th International Theophilus Symposium (IFAC-2022) on Spectroscopy of Crystals Activated by Ions of Rare Earths and Transition Metals (August 22-26, 2022, Moscow)
Optical materials

Optical spectroscopy of the Er$^{3+}$ ions in BaY$_{1,8}$Lu$_{0,2}$F$_8$ crystals

A. V. Astrakhantseva^a, A. A. Shavelev^a, S. V. Kuznetsov^b, A. G. Nikolaev^c, K. N. Boldyrev^d, A. S. Nizamutdinov^a, V. V. Semashko<sup>ae

a</sup> Kazan Federal University, Kazan, Tatarstan, Russia
^b Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
^c Institute of Geology and Oil and Gas Technologies, Kazan Federal University, 420008 Kazan, Russia
^d Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
^e Zavoisky Physical Technical Institute, Kazan Scientific Center of the Russian Academy of Sciences, 420029 Kazan, Russia

Abstract: The spectral and kinetic characteristics of Er$^{3+}$ ions in heavily doped BaY$_{1,8}$Lu$_{0,2}$F$_8$ mixed crystals have been studied. Absorption and luminescence spectra were recorded for BaY$_{1,8}$Lu$_{0,2}$F$_8$ crystals with Er$^{3+}$ 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 Er$^{3+}$ 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$_{1,8}$Lu$_{0,2}$F$_8$ crystals with Er$^{3+}$ ion concentrations of 20.0 and 30.0 at.% is estimated at different pump powers.

Keywords: population inversion, gain coefficient, modeling, fluorides.

Received: 01.11.2022
Revised: 10.04.2023
Accepted: 11.04.2023

DOI: 10.21883/OS.2023.05.55708.61-22

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