AN IMAGING FABRY–PÉROT SYSTEM FOR THE ROBERT STOBIE SPECTROGRAPH ON THE SOUTHERN AFRICAN LARGE TELESCOPE
AN IMAGING FABRY–PÉROT SYSTEM FOR THE ROBERT STOBIE SPECTROGRAPH ON THE SOUTHERN AFRICAN LARGE TELESCOPE
复制标题
南非大型望远镜罗伯特·斯托比摄谱仪的法布里-珀罗成像系统
DOI：
10.1088/0004-6256/135/5/1825
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
IC Optical Systems Ltd.
中科院分区：
文献类型：
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作者：
N. Rangwala;T. Williams;C. Pietraszewski;Charles L. Joseph Rutgers University;IC Optical Systems Ltd.
我们介绍了10 m级南部非洲大望远镜上罗伯特·斯托比光谱仪的法布里-佩罗特系统的设计及其在实验室中测量的特征。该系统提供了在任何所需波长下的光谱成像，该波长跨越带通430-860 nm，具有范围从300到9000的四种不同光谱分辨率（λ/Δλ）。我们的实验室测试揭示了标准具间隙和平行度的波长依赖性，最大变化在600-720 nm之间，这是由于宽带多层电介质涂层的复杂结构而产生的。我们还报告了一个意想不到的光学效果，这种多层涂层结构，产生了显着的，波长依赖性，在标准具板的表观形状的变化。这种变化是由两种效应引起的：涂层中的物理不均匀性或厚度变化，以及反射时相位变化的波长依赖性，其可以放大这些不均匀性。我们讨论了这些涂层的分辨率，精细度和系统的吞吐量的影响。这个法布里-珀罗系统将为世界上最大的望远镜之一的光谱成像提供一个强大的工具。
We present the design of the Fabry–Pérot system of the Robert Stobie Spectrograph on the 10 m class Southern African Large Telescope and its characterization as measured in the laboratory. This system provides spectroscopic imaging at any desired wavelength spanning a bandpass 430–860 nm, at four different spectral resolving powers (λ/Δλ) ranging from 300 to 9000. Our laboratory tests revealed a wavelength dependence of the etalon gap and parallelism with a maximum variation between 600–720 nm that arises because of the complex structure of the broadband multi-layer dielectric coatings. We also report an unanticipated optical effect of this multi-layer coating structure that produces a significant, and wavelength-dependent, change in the apparent shape of the etalon plates. This change is caused by two effects: the physical non-uniformities or thickness variations in the coating layers, and the wavelength dependence of the phase change upon reflection that can amplify these non-uniformities. We discuss the impact of these coating effects on the resolving power, finesse, and throughput of the system. This Fabry–Pérot system will provide a powerful tool for imaging spectroscopy on one of the world's largest telescopes.