Large-Area Reflective Infrared Filters for Millimeter/Sub-mm Telescopes

Large-Area Reflective Infrared Filters for Millimeter/Sub-mm Telescopes
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用于毫米/亚毫米望远镜的大面积反射式红外滤光片

DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
T. Pothoven
T. Pothoven
中科院分区：
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文献类型：
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作者：
Z. Ahmed;J. Grayson;K. Thompson;C. Kuo;G. Brooks;T. Pothoven

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地面上的毫米和亚毫米望远镜正试图用更大的低温冷却测热计阵列来成像天空，但在减轻大口径伴随的红外负荷方面面临挑战。由机械冷却器支撑的吸收式红外滤光片的孔径尺寸不够。放置在望远镜窗后的反射金属网过滤器原则上提供了一种可扩展的解决方案，但受到光刻技术的限制，其直径不得超过300毫米。我们提出激光蚀刻作为光刻的一种替代技术，用于制造大面积反射滤光片，并展示了500毫米直径滤光片的实验室测试结果。利用现有的激光蚀刻技术，可以制造直径达700毫米的滤光片。
Ground-based millimeter and sub-millimeter telescopes are attempting to image the sky with ever-larger cryogenically-cooled bolometer arrays, but face challenges in mitigating the infrared loading accompanying large apertures. Absorptive infrared filters supported by mechanical coolers scale insufficiently with aperture size. Reflective metal-mesh filters placed behind the telescope window provide a scalable solution in principle, but have been limited by photolithography constraints to diameters under 300 mm. We present laser etching as an alternate technique to photolithography for fabrication of large-area reflective filters, and show results from lab tests of 500-mm-diameter filters. Filters with up to 700-mm diameter can be fabricated using laser etching with existing capability.