PRAXIS: beating the infrared night sky with multicore fibre Bragg gratings

实践：用多核光纤布拉格光栅击打红外夜空： Praxis项目旨在开创地面红外观测的新纪元。红外夜空比光学夜空亮一百倍，这严重限制了对这些波长的敏感度。但99%的红外线天空来自数百条极其明亮、狭窄的发射线，这是由于地球大气层中的羟基造成的。英澳望远镜的PRAXIS设计使用澳大利亚开发的新的多芯光纤布拉格光栅来消除这些线。新的光纤将使夜空变得非常黑暗，使澳大利亚天文学家能够获得独特的观测结果。抑制天空的纤维还将使我们能够为澳大利亚的超大型望远镜开发新的仪器概念。

PRAXIS: beating the infrared night sky with multicore fibre Bragg gratings: The PRAXIS project aims to deliver a new era in ground-based infrared observations. The infrared night sky is a hundred times brighter than the optical night sky, which has severely limited the sensitivity at these wavelengths. But 99 per cent of the infrared sky arises from hundreds of extremely bright, narrow emission lines due to hydroxyl in the Earth's atmosphere. PRAXIS, at the Anglo-Australian Telescope, is designed to cancel these lines using new multicore fibre Bragg gratings developed in Australia. The new fibres would render the night sky very dark and allow Australian astronomers to obtain unique observations. The sky-suppressing fibres would also allow us to develop new instrument concepts for Australia's extremely large telescope.