南非大望远镜RobertStobie摄谱仪的Fabry-Perot成象系统
An Imaging Fabry-Perot System for the Robert Stobie Spectrograph on the Southern African Large Telescope
摘要：
本文介绍了南非10米级大望远镜RobertStobie摄谱仪的法布里-珀罗系统的设计及其在实验室中的测量结果。该系统提供了光谱成像在任何所需的波长跨越带通430 - 860纳米，在四个不同的光谱分辨能力范围从300到9000。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。我们还报告了这种多层涂层结构的意外光学效应，其产生了标准具板的表观形状的显著且依赖于波长的变化。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，以及反射时相变的波长依赖性，这会放大这些不均匀性。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。
英文摘要：
We present the design of the Fabry-Perot system of the Robert Stobie Spectrograph on the 10-meter 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 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 refection 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-Perot system will provide a powerful tool for imaging spectroscopy on one of the world's largest telescopes.
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