STP799

    Multispectral Chemically Vapor-Deposited ZnS: An Initial Characterization

    Published: Jan 1983


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    Abstract

    Standard-grade chemically vapor-deposited (CVD) ZnS has a dark orange, yellow milky appearance and exhibits a substantial amount of scatter in the near infrared, which limits its usefulness at the shorter wavelengths. Recently, we have succeeded in developing a “multispectral” CVD-ZnS material configuration, which is colorless and shows evidence of much improved transmittance throughout the spectral range of interest. In this paper, we report on work that has been carried out in the context of assessing the properties of this material, particularly with regard to (a) Infrared absorption. Thermocouple calorimetry measurements conducted at 1.3, 2.7, and 3.8 μm indicate that multispectral CVD Zns has effective absorption coefficients of 1 × 10−3cm−1 or less, thus establishing this material as a credible candidate for chemical-laser window applications. (b) Elastic behavior. Measurements of Young's modulus (87.6 GPa) and Poisson's ratio (0.318) in conjunction with sound-velocity measurements in the longitudinal mode (5.47 km/sec) demonstrate that multispectral CVD ZnS behaves precisely as predicted for a randomly-oriented single-phase polycrystalline aggregate of cubic ZnS. (c) Fracture mechanics. The results of Knoop hardness, flexural strength, and laser-damage experiments will be presented; we will also discuss techniques for improving the fracture toughness.

    Keywords:

    chemical vapor deposition, polycrystallinity laser damage tests, multispectral, ZnS


    Author Information:

    Williangham, C
    Raytheon Company Waltham, Massachusetts,

    Klein, C
    Raytheon Company Waltham, Massachusetts,

    Pappis, J
    Raytheon Company Waltham, Massachusetts,


    Paper ID: STP37226S

    Committee/Subcommittee: F01.02

    DOI: 10.1520/STP37226S


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