PRAXIS: an OH suppression optimised near infrared spectrograph

Micro + Nano Materials, Devices, and Applications Pub Date : 2020-01-06 DOI:10.1117/12.2539883

S. Ellis, J. Bland-Hawthorn, S. Bauer, S. Case, R. Content, T. Fechner, D. Giannone, R. Haynes, E. Hernandez, A. Horton, U. Klauser, J. Lawrence, S. Leon-Saval, H. Löhmannsröben, S. Min, N. Pai, M. Roth, L. Waller, R. Zhelem

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引用次数: 1

Abstract

The problem of atmospheric emission from OH molecules is a long standing problem for near-infrared astronomy. We are now close to solving this problem for the first time with the PRAXIS instrument. PRAXIS is a unique spectrograph which is fed by fibres that remove the OH background, and is optimised specifically to benefit from OH-Suppression. The OH suppression is achieved with fibre Bragg gratings, which were tested successfully on the GNOSIS instrument. The OH lines are suppressed by a factor of ~1000, leading to a reduction of the integrated background of a factor ≈9. A future upgrade to multicore fibre Bragg gratings will further increase this reduction. PRAXIS has had two commissioning runs, with a third commissioning run planned for July 2019, which will be presented at the conference. PRAXIS has a measured throughput of ≈20 %, demonstrating high efficiency in an OH suppression instrument for the first time. Science verification observations of Seyfert galaxies demonstrate the potential of OH suppression.

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一种OH抑制优化近红外光谱仪

氢氧根分子的大气辐射问题是近红外天文学长期存在的问题。我们现在第一次用PRAXIS仪器接近解决这个问题。PRAXIS是一种独特的光谱仪，它由去除OH背景的纤维馈送，并经过专门优化，可以从OH抑制中获益。利用光纤布拉格光栅实现了OH抑制，并在GNOSIS仪器上成功地进行了测试。OH谱线被抑制约1000倍，导致积分背景降低约9倍。未来升级到多芯光纤布拉格光栅将进一步增加这种减少。PRAXIS已经进行了两次试运行，第三次试运行计划于2019年7月进行，并将在会议上进行介绍。PRAXIS的测量通量约为20%，首次在OH抑制仪器中展示了高效率。对塞弗特星系的科学验证观测证明了OH抑制的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Micro + Nano Materials, Devices, and Applications

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