Fluorescence quantum efficiency measurements in the presence of Auger upconversion by the thermal lens method

    Authors

    V. Pilla; T. Catunda; H. P. Jenssen;A. Cassanho

    Comments

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    Abbreviated Journal Title

    Opt. Lett.

    Keywords

    LASER CRYSTALS; UP-CONVERSION; CRLISRALF6; OPERATION; Optics

    Abstract

    Mode-mismatched thermal lens (TL) measurements in Cr3+-doped fluoride crystals (LiSrAlF6 and LiSrGaF6) are reported. A nonlinear increase of the TL signal, and decrease of quantum efficiency, with increasing excitation power was observed and attributed to energy-transfer upconversion (ETU). Assuming an upconversion rate that is proportional to the excited-state population, W-up = gammaN(e), the theoretical model developed fits the experimental data well. The ETU parameters (gamma) were determined with unprecedented accuracy for low Cr concentrations. Thermo-optical parameters (K, ds/dT) were also obtained. (C) 2003 Optical Society of America.

    Journal Title

    Optics Letters

    Volume

    28

    Issue/Number

    4

    Publication Date

    1-1-2003

    Document Type

    Article

    Language

    English

    First Page

    239

    Last Page

    241

    WOS Identifier

    WOS:000180757400007

    ISSN

    0146-9592

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