Mechanisms of the energy transfer between thulium ions in tungstate and molybdate crystals

  • Natali V. Gusakova Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus
  • Maxim P. Demesh Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus
  • Anatol S. Yasukevich Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus
  • Anatoliy A. Pavlyuk Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Academician Lavrentiev Avenue, Novosibirsk 630090, Russia
  • Nikolay V. Kuleshov Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus

Abstract

In this work, we investigated mechanisms of the energy transfer in Tm : KY(WO4)2, Tm : KLu(WO4)2 and Tm:NaBi(MoO4)2 crystals. Room-temperature absorption and emission spectra were used to determine microparameters of energy migration among thulium ions in the 3H4 and 3F4 excited states in the frames of Förster – Dexter theory. Parameters of cross-relaxation 3H4 + 3H63F4 + 3F4 and energy migration were obtained via analysis of luminescence decay 3H4 → 3F4 with a hopping model. The parameters describing excitation migration between thulium ions in 3H4 state obtained by two methods were in good agreement. It has been shown that the dipole-dipole mechanism of interaction is responsible for the efficient cross-relaxation process in the crystals under study. The results indicate that the energy migration between 3H4 enhances the cross-relaxation at thulium content more than ∼1.3–1.5 at. % in these laser materials. The obtained values of the migration parameters CDD exceed the values of the cross-relaxation parameters CDA, and the energy transfer in these materials can be described with the hopping model. An efficient cross-relaxation process leads to the relatively high efficiencies of the systems based on these crystals under pumping at 0.8 µm. The dominant process of energy migration between thulium ions in 3F4 excited state makes tungstate and molybdate crystals good candidates for the Ho3+ co-activation for laser generation at 2.1 µm. Parameters obtained in this study can be used for mathematical modeling of laser characteristics.

Author Biographies

Natali V. Gusakova, Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus

junior researcher at the scientific research center for optical materials and technologies, faculty of instrumentation engineering

Maxim P. Demesh, Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus

PhD (physics and mathematics); senior researcher at the scientific research center for optical materials and technologies, faculty of instrumentation engineering

Anatol S. Yasukevich, Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus

PhD (physics and mathematics), docent; leading researcher at the scientific research center for optical materials and technologies, faculty of instrumentation engineering

Anatoliy A. Pavlyuk, Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Academician Lavrentiev Avenue, Novosibirsk 630090, Russia

PhD (engineering); chief of the group of oxide crystals growing

Nikolay V. Kuleshov, Belarusian National Technical University, 65 Niezaliežnasci Avenue, Minsk 220013, Belarus

doctor of science (physics and mathematics), full professor; head of the department of laser devices and technology, faculty of instrumentation engineering

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Published
2021-02-11
Keywords: thulium, energy migration, cross-relaxation, tungstates, molybdates
Supporting Agencies N. V. Gusakova acknowledges support from the World Federation of Scientists.
How to Cite
Gusakova, N. V., Demesh, M. P., Yasukevich, A. S., Pavlyuk, A. A., & Kuleshov, N. V. (2021). Mechanisms of the energy transfer between thulium ions in tungstate and molybdate crystals. Journal of the Belarusian State University. Physics, 1, 33-40. https://doi.org/10.33581/2520-2243-2021-1-33-40