Optical-quality chemical vapor deposited diamond has optical, thermal and mechanical properties similar to those of natural Type IIa diamond with the exposition of low strenth in synthetic diamond. Clear windows up to 60 cm in diameter and 0,75 mm thick have been produced. Domes with a diameter of 60-70 mm and a thickness of 1 mm have been grown and machined on the outer surface by a laser process that reduces the surface roughness to 1 mikrometer. Major challenges for diamond windows and domes are increasing the mechanical strength, improwing the grow rate and improving the efficiency of polishing. Four methods for attaching thin protective coatings of diamonds to infrared windows have been demonstrated. Other protective coatings developed recently include boron phospide, gallium phosphide, zinc sulfide, diamond-like carbon, amorphic diamond and polymers. Sapphire is the most durable, commercially available infrared window material, but its high temperature performance is limited by inability to withstand compression along the optical axis of the crystal. The compressive strength loss from the 20 grade C value is 84 % at 400 grade C and 97 % at 600 grade C. Pros and cons of using ZNS, ZnSe, GaAs, GaP Ge and Si as 2-color (midwave and long wave) windows are discussed. Engineering alternatives must be considered for extending the range of operating conditions for infrared windows and dome materials.


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    Titel :

    Frontiers in Infrared Windows and Dome Materials


    Weitere Titelangaben:

    Anforderungen an Werkstoffe für infrarotdurchlässige Beobachtungsfenster und Abdeckungskuppeln (Radome) insbesondere für Diamantbeschichtungen und neue Werkstoffe


    Beteiligte:
    Harris, D.C. (Autor:in)


    Erscheinungsdatum :

    1995


    Format / Umfang :

    11 Seiten, 7 Bilder, 2 Tabellen, 41 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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