Upconversion, lifetime quenching, and ground-state bleaching in Nd3+:LiYF4

Markus Pollnau, P.J. Hardman, W.A. Clarkson, D.C. Hanna

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    Abstract

    Since the Nd3+:LiYF4 system has some advantage over Nd3+:YAG and Nd3+:YVO4 for high-power scaling of diode-end-pumping, this system has been investigated under strong excitation, in this case using a Ti:sapphire pump. The interionic processes responsible for fluorescence saturation have been determined, due allowance being taken for the significant ground-state bleaching under these conditions. Their temperature dependence, which is relevant to scaling consideration, has been investigated theoretically, and found to be rather small over a wide temperature range. By comparing the experimental data with finite-element rate-equation calculations, the influence of interionic upconversion is determined quantitatively, and a published value of the upconversion parameter is confirmed. The spatial dependence of ground-state bleaching and quenching of the fluorescence lifetime is calculated. Analytical expressions are derived, including the influence of interionic upconversion, for the dependence of ground-state bleaching, excitation density, and storage time on pump parameters and dopant concentration.
    Original languageUndefined
    Pages (from-to)203-211
    Number of pages9
    JournalOptics communications
    Volume147
    Issue number1-3
    DOIs
    Publication statusPublished - 1998

    Keywords

    • IOMS-APD: Active Photonic Devices
    • EWI-17570
    • interionic processes
    • lifetime quenching
    • Upconversion
    • IR-70104
    • Neodymium
    • Lithium Yttrium Fluoride
    • ground-state bleaching

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