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Abstract <p>In this work, the energy transfer parameters <i>W</i><sub>11</sub> and <i>W</i><sub>22</sub> between Er<sup>3+</sup> ions in mixed BaY<sub>1.8</sub>Lu<sub>0.2</sub>F<sub>8</sub> crystals were determined within the Förster–Dexter theory for a three-level scheme including only the up-conversion processes from the upper and lower laser levels (<sup>4</sup>I<sub>11/2</sub> and <sup>4</sup>I<sub>13/2</sub>). The energy transfer constant <i>C</i><sub>DA</sub> and the critical radius <i>R</i><sub>0</sub> were also determined. For the scheme including the up-conversion processes from the upper and lower laser levels, a system of rate equations was constructed to estimate the population distribution of excited states and the gain for pulsed pumping of different powers. With a pump wavelength of 970&#xa0;nm, a pump pulse duration of 10 ms, a pulse repetition rate of 10 Hz and a pump power of 4 W, the gain of 0.05 cm<sup>–1</sup> was obtained for a sample with an Er<sup>3+</sup> ion concentration of 30 at %.</p>

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Determination of the Parameters of Photodynamic Processes between Er3+ Ions in the BaY1.8Lu0.2F8 Crystal

  • 期刊论文

  • 发表日期：

    2026年5月25日

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  • A. V. Astrakhantseva,
  • T. M. Minnebaev,
  • A. S. Nizamutdinov

摘要

Abstract

In this work, the energy transfer parameters W11 and W22 between Er3+ ions in mixed BaY1.8Lu0.2F8 crystals were determined within the Förster–Dexter theory for a three-level scheme including only the up-conversion processes from the upper and lower laser levels (4I11/2 and 4I13/2). The energy transfer constant CDA and the critical radius R0 were also determined. For the scheme including the up-conversion processes from the upper and lower laser levels, a system of rate equations was constructed to estimate the population distribution of excited states and the gain for pulsed pumping of different powers. With a pump wavelength of 970 nm, a pump pulse duration of 10 ms, a pulse repetition rate of 10 Hz and a pump power of 4 W, the gain of 0.05 cm–1 was obtained for a sample with an Er3+ ion concentration of 30 at %.