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6 July 2006 Multi-slit mask fabrication on spherical electroformed shell substrates
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We discuss the application of modern precision electroforming technology to the fabrication of multi-slit masks used for multi-object spectroscopy. Electroforming technology is capable of producing very accurate compound curved thin metal shells using nickel or nickel-cobalt material. The curved slit masks can be fabricated to conform to a curved focal surface of spherical, conic, or arbitrary shape. A variety of optical coatings including gold and extremely low reflectivity copper oxide can be applied to the electroformed mask substrate prior to cutting slits. Precise rectangular slits and apertures of arbitrary shape are readily machined in the nickel materials using a three axis YAG laser machining system.
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Thomas P. O'Brien and Jason D. Eastman "Multi-slit mask fabrication on spherical electroformed shell substrates", Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 62732V (6 July 2006); doi: 10.1117/12.670437;

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