Spectroscopic Evaluation Of Cayalo4 Doped With Trivalent Er, Tm, Yb And Ho For Eyesafe Laser Applications

    Authors

    J. A. Hutchinson; H. R. Verdun; B. H. T. Chai; B. Zandi;L. D. Merkle

    Comments

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    Abbreviated Journal Title

    Opt. Mater.

    Keywords

    RARE-EARTH IONS; CRYSTAL-FIELD ANALYSIS; ENERGY-LEVELS; CANDALO4; SPECTRA; YAG; ND; Materials Science, Multidisciplinary; Optics

    Abstract

    Spectroscopic properties of relevance for laser applications have been studied for rare earths in CaYAlO4. Fitting of a theoretical model to observed energy levels yields crystal field parameters and unobserved levels. Structural disorder leads to broad linewidths, but cross sections are larger than in many common hosts. Tm-Tm cross relaxation rates are comparable to those in Tm:YAG, and Yb-Er transfer rates are comparable to those in Yb, Er:phosphate glass. Room temperature Yb-Er upconversion is stronger than in YAG, but modeling shows that neither unconversion nor population of Er I-4(13/2) is very efficient upon pumping Yb. The host's yellow color intensifies upon annealing in air, a potential problem for visible laser operation. Tm or Ho 2 mu m laser operation, or Er 1.5 mu m operation upon direct excitation of Er I-4(13/2), are more promising.

    Journal Title

    Optical Materials

    Volume

    3

    Issue/Number

    4

    Publication Date

    1-1-1994

    Document Type

    Article

    Language

    English

    First Page

    287

    Last Page

    306

    WOS Identifier

    WOS:A1994QQ35800009

    ISSN

    0925-3467

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