STP1028

    Mass Spectrometric Studies of Laser Damage in Calcium Fluoride

    Published: Jan 1988


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    Abstract

    Both electron impact- and laser ionization-mass spectrometry have been used to probe the material spalled from CaF2 surfaces by the fundamental(1.06μ) and harmonic (355 nm and 266 nm) outputs from a Q-switched Nd:YAG laser. We have identified a number of gas phase products, including Ca, CaF and tentatively, CaF2, and have measured their translational and internal energy distributions.

    Our results suggest that while the 1.06μ experiments can be adequately modeled in terms of a single damage mechanism (likely avalanche breakdown), the short-wavelength results suggest the onset of second mechanism, perhaps multiphoton absorption. This is consistent with both the observed bimodal velocity distribution following short-wavelength damage, and with the decrease in CaF vibrational and rotational excitation.

    Keywords:

    CaF, 2, damage, Nd:YAG, mass spectroscopy


    Author Information:

    Nogar, NS
    Los Alamos National Laboratory, Los Alamos, New Mexico

    Apel, EC
    Los Alamos National Laboratory, Los Alamos, New Mexico

    Estler, RC
    Fort Lewis College, Durango, Colorado


    Paper ID: STP18534S

    Committee/Subcommittee: E13.03

    DOI: 10.1520/STP18534S


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