Composite vacuum-tight window for simultaneous far-infrared and optical observations

Computer Science – Performance

Scientific paper

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Composite Materials, Far Infrared Radiation, Infrared Windows, Light (Visible Radiation), Transmissivity, Infrared Telescopes, Mechanical Properties, Optical Properties, Performance Tests

Scientific paper

The paper analyzes the optimization of windows which must transmit in the visible and in the far-infrared. The mechanical strength and the far-infrared transmission of available materials (mylar, TPX, quartz, sapphire, silica, diamond, plexiglass) are reviewed. A composite window which is vacuum-tight and can withstand differential pressures of 1 bar is described. This window has permitted successful observations on the KAO airborne telescope with transmission higher than 70 per cent in the 50-200-micron range.

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