Discrimination between electronic and thermal contributions to the nonlinear refractive index of SrAlF5 : Cr+3

    Authors

    A. A. Andrade; E. Tenorio; T. Catunda; M. L. Baesso; A. Cassanho;H. P. Jenssen

    Comments

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    Abbreviated Journal Title

    J. Opt. Soc. Am. B-Opt. Phys.

    Keywords

    DOPED FLUOROINDATE GLASSES; Z-SCAN; CRYSTALS; SOLIDS; MODEL; BEAM; Optics

    Abstract

    In ion-doped solids there is a nonlinear refractive index n(2) that is due to the polarizability difference Delta alpha between excited and ground states, the so-called population-lens (PL) effect. In addition, the thermal-lens (TL) effect is particularly important in fluoride materials, owing to their low thermal conductivity. We performed time-resolved Z-scan and mode-mismatched TL measurements at lambda = 488 nm in SrAlF5:Cr+3 In this crystal the PL effect is faster than that of the TL, owing to its relatively short metastable lifetime (93 mu s), and therefore we could temporally discriminate between these two contributions to the nonlinear refractive index. For the PL effect we measured n(2) = (6.6 + 1.7i) x 10(-11) cm(2)/W-1 and calculated Delta alpha = 3.1 x 10(-26) cm(3) and Delta alpha = 1.7 x 10(-20) cm(2). From the TL measurements we obtained the thermal diffusivity D = 6.5 x 10(-3) cm(2)s(-1) and estimated the thermal conductivity K = 1.7 x 10(-2)W cm(-1)K(-1) and ds/dT = -8.5 x 10(-7) K-1. (C) 1999 Optical Society of America [S0740-3224(99)00203-9]. OCIS codes: 190.0190, 190.4400, 190.4870, 300.6420, 160.3380, 160.4670.

    Journal Title

    Journal of the Optical Society of America B-Optical Physics

    Volume

    16

    Issue/Number

    3

    Publication Date

    1-1-1999

    Document Type

    Article

    Language

    English

    First Page

    395

    Last Page

    400

    WOS Identifier

    WOS:000079021700006

    ISSN

    0740-3224

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