STP1028

    Nonlinear Absorption Initiated Avalanche Breakdown in Dielectric ZrO2

    Published: Jan 1988


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    Abstract

    We report direct measurements of nonlinear transmission in dielectric ZrO2 prior to the observation of catastrophic damage for nsec laser pulses at 532 nm. The tested cubic zirconia (ZrO2) specimens are stabilized with yttria (Y2O3) having concentrations of 9.4%, 12%, 15%, 18%, and 21%. Transmission measurements were performed for a broad range of pulsewidths from 40 psec to 18 nsec (FWHM) at 532 nm. Our results indicate that the nonlinearity prior to breakdown is mainly attributed to the formation of material defects (color centers) by two-photon absorption (2PA) at high irradiance. These induced color centers appear to be long-lived (the order of hours) but can be bleached by repeated irradiation with relatively low irradiance 532 nm pulses. The accumulated effects of color center absorption during the 2PA measurements makes extraction of the two-photon absorption coefficient difficult. However, the smallest value for the 2PA coefficient (∼0.04 cm/GW) was measured in the ZrO2 sample stabilized with 9.4% Y2O3 for the shortest pulsewidth (40 psec) with which the measurements were performed. The observed nonlinear transmission prior to breakdown is consistent with the interpretation that damage in this material is due to 2PA induced avalanche breakdown.

    Keywords:

    color centers, cubic zirconia, damage, 532 nm, nonlinear absorption, nsec pulses, psec pulses, two-photon absorption


    Author Information:

    Mansour, N
    Center for Research in Electro-Optics and Lasers (CREOL) University of Central Florida, Orlando, Florida

    Canto, E
    Center for Research in Electro-Optics and Lasers (CREOL) University of Central Florida, Orlando, Florida

    Soileau, MJ
    Center for Research in Electro-Optics and Lasers (CREOL) University of Central Florida, Orlando, Florida

    Van Stryland, EW
    Center for Research in Electro-Optics and Lasers (CREOL) University of Central Florida, Orlando, Florida


    Paper ID: STP18603S

    Committee/Subcommittee: F01.10

    DOI: 10.1520/STP18603S


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