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<p>Up-conversion luminescence (UCL) spectra of fluorophosphate glasses doped with the pair of rare-earth ions (REIs) ytterbium (4%) and thulium (0.1%) excited by radiation of a diode laser operating in steady-state mode at wavelength 975 nm are studied. Each of the observed UCL bands is a result of manifestation of several up-conversion processes (UCPs) corresponding to luminescence of thulium ions from different excited states. These UCPs are characterized by different degrees of effective nonlinearity (EN). The effect of pump power on UCL spectra formed by UCPs with different ENs is studied. The possibility of separation of spectra corresponding to individual UCPs from the total experimentally measured UCL spectrum of fluorophosphate glass doped with the pair of REIs ytterbium (4%) and thulium (0.1%) is demonstrated. The separation is based on the calculation of the EN based on the dependences of the UCL on the excitation power.</p>

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Verification and Spectral Separation of Up-Conversion Processes in Fluorophosphate Glass Doped with Ytterbium and Thulium Ions Based on the Dependence of Their Effective Nonlinearity on Wavelength

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • M. V. Korolkov,
  • I. A. Khodasevich,
  • A. S. Grabtchikov,
  • G. Munkhbayar,
  • D. S. Mogilevtsev

摘要

Up-conversion luminescence (UCL) spectra of fluorophosphate glasses doped with the pair of rare-earth ions (REIs) ytterbium (4%) and thulium (0.1%) excited by radiation of a diode laser operating in steady-state mode at wavelength 975 nm are studied. Each of the observed UCL bands is a result of manifestation of several up-conversion processes (UCPs) corresponding to luminescence of thulium ions from different excited states. These UCPs are characterized by different degrees of effective nonlinearity (EN). The effect of pump power on UCL spectra formed by UCPs with different ENs is studied. The possibility of separation of spectra corresponding to individual UCPs from the total experimentally measured UCL spectrum of fluorophosphate glass doped with the pair of REIs ytterbium (4%) and thulium (0.1%) is demonstrated. The separation is based on the calculation of the EN based on the dependences of the UCL on the excitation power.