STP689: Bulk Optical Properties of Fine Grained Forged Calcium Fluoride

    Anderson, RH
    Honeywell Corporate Material Sciences Center, Bloomington, MN.

    Skogman, RA
    Honeywell Corporate Material Sciences Center, Bloomington, MN.

    Ready, JF
    Honeywell Corporate Material Sciences Center, Bloomington, MN.

    Bennett, JM
    Honeywell Corporate Material Sciences Center, Bloomington, MN.

    Pages: 8    Published: Jan 1979


    Abstract

    Single crystals of CaF2 having ⟨111⟩. ⟨100⟩. ⟨112⟩. and ⟨113⟩ orientations have been routinely isostatically foreed in a helium atmosphere at 750°C. The crvstals were deformed 60 percent to ensure a uniform grain size of less than 15µm. A fine cloudiness of “veiling” occurs when the forging is done below the recrvstallization temperature of about 800°C for CaF2. Nomarski micrographs show that voids are distributed within the bulk of the forgings. Polariscope photographs show internal stress. Total integrated forward scattering measurements have been made on the sample immersed in a cell containing index matching fluid to eliminate scattering from the sample surfaces. These measurements show variations cannot be definitely correlated with the positions of veils in the CaF2.

    Keywords:

    Calcium fluoride, forging, laser windows, optical properties, scattering


    Paper ID: STP39107S

    Committee/Subcommittee: F01.02

    DOI: 10.1520/STP39107S


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