STP1028

    The Effect of Impurities on U.V. Damage in CaF2

    Published: Jan 1988


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    Abstract

    The paper discusses the role of impurities in bulk laser breakdown. Crystals of CaF2 have been grown with different impurity content. The introduced impurities are mainly rare earths, these being the most common contaminent species found in CaF2. Crystals selectively doped with Ce as well as very pure, strain annealed specimens were also grown. The generation of defect centres as a function of incident 248 nm laser fluence was monitored by transient absorption measurements. Bulk damage measurements indicated that the Ce doped crystals had the lowest thresholds followed by the pure strain annealed crystals, despite a complete absence of excited state absorbing centres produced during laser irradiation. Those crystals which showed a significant production of transient defects and fluorescent levels had very high damage thresholds.

    Keywords:

    colour centres, excimer damage, effect of impurities, surface and bulk effects, transient absorption, 248nm


    Author Information:

    Laidler, I
    Loughborough Unversity of Tehnology, Loughborough, Leics

    Emmony, DC
    Loughborough Unversity of Tehnology, Loughborough, Leics


    Paper ID: STP18546S

    Committee/Subcommittee: F01.10

    DOI: 10.1520/STP18546S


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