Optical design of the SuMIRe/PFS spectrograph
Optical design of the SuMIRe/PFS spectrograph
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SuMIRe/PFS 摄谱仪的光学设计
DOI：
10.1117/12.2055738
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
J. Gunn
中科院分区：
文献类型：
--
作者：
S. Pascal;S. Vives;R. Barkhouser;J. Gunn
为8米级SUBARU望远镜开发的SuMIRe主焦点摄谱仪（PFS）将由四台相同的摄谱仪组成，每台摄谱仪在望远镜主焦点处接收来自2394光纤机器人定位器的600根光纤。每个光谱仪包括三个光谱通道，以覆盖波长范围[0.38-1.26] um，分辨能力范围在2000和4000之间。还实现了中等分辨率模式，以在0.8 μ m处达到5000的分辨率。每个摄谱仪由4个光学单元组成：产生三个校正准直光束的入口单元和三个相机单元（每个光谱通道一个：“蓝色”，“红色”和“NIR”）。光束通过使用两个大的二向色镜分裂;在每个臂中，光被大的VPH光栅（约280 x280 mm）分散。提出的光学设计进行了优化，以实现所要求的图像质量，同时简化了整个光学系统的制造。相机设计包括一个创新的施密特相机观察大视场（10度）与非常快的光束（F/1.09）。为了实现这样的性能，经典的球面镜被折反射镜（即，在玻璃的后侧具有反射表面的弯月形透镜，如曼金镜）代替。本文重点介绍了PFS摄谱仪的光学结构和实现的性能。我们将首先描述摄谱仪的全局光学设计。然后，我们将重点介绍Mangin-Schmidt相机的设计。最后给出了光学性能的分析和得到的结果。
The SuMIRe Prime Focus Spectrograph (PFS), developed for the 8-m class SUBARU telescope, will consist of four identical spectrographs, each receiving 600 fibers from a 2394 fiber robotic positioner at the telescope prime focus. Each spectrograph includes three spectral channels to cover the wavelength range [0.38-1.26] um with a resolving power ranging between 2000 and 4000. A medium resolution mode is also implemented to reach a resolving power of 5000 at 0.8 um. Each spectrograph is made of 4 optical units: the entrance unit which produces three corrected collimated beams and three camera units (one per spectral channel: "blue, "red", and “NIR”). The beam is split by using two large dichroics; and in each arm, the light is dispersed by large VPH gratings (about 280x280mm). The proposed optical design was optimized to achieve the requested image quality while simplifying the manufacturing of the whole optical system. The camera design consists in an innovative Schmidt camera observing a large field-of-view (10 degrees) with a very fast beam (F/1.09). To achieve such a performance, the classical spherical mirror is replaced by a catadioptric mirror (i.e meniscus lens with a reflective surface on the rear side of the glass, like a Mangin mirror). This article focuses on the optical architecture of the PFS spectrograph and the perfornance achieved. We will first described the global optical design of the spectrograph. Then, we will focus on the Mangin-Schmidt camera design. The analysis of the optical performance and the results obtained are presented in the last section.