EAGLE ISS - A modular twin-channel integral-field near-IR spectrograph
P. R. Hastings, B. Stobie, S. Vives, P. Vola, M. Wells, C. J. Evans
TL;DR
The paper presents the design and implementation of EAGLE ISS, a modular twin-channel near-IR spectrograph for the E-ELT, featuring innovative cryogenic and optical technologies for high-precision astronomical observations.
Contribution
It introduces a novel modular twin-channel integral-field spectrograph with advanced cryogenic mechanisms and optical design for the E-ELT.
Findings
Successful optical design employing anamorphic magnification and image slicing.
Implementation of cryo-mechanisms for VPH gratings scanning.
Use of high-precision cryo-mechanisms and modular structure for reliability.
Abstract
The ISS (Integral-field Spectrograph System) has been designed as part of the EAGLE Phase A Instrument Study for the E-ELT. It consists of two input channels of 1.65x1.65 arcsec field-of-view, each reconfigured spatially by an image-slicing integral-field unit to feed a single near-IR spectrograph using cryogenic volume-phase-holographic (VPH) gratings to disperse the image spectrally. A 4k x 4k array detector array records the dispersed images. The optical design employs anamorphic magnification, image slicing, VPH gratings scanned with a novel cryo-mechanism and a three-lens camera. The mechanical implementation features IFU optics in Zerodur, a modular bench structure and a number of high-precision cryo-mechanisms.
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