EAGLE ISS - A modular twin-channel integral-field near-IR spectrograph

Details EAGLE ISS - A modular twin-channel integral-field near-IR spectrograph EAGLE ISS - A modular twin-channel integral-field near-IR spectrograph

2010-07-09

arxiv.org/abs/1007.1587v1

Astronomy and Astrophysics

Astrophysics

Instrumentation and Methods for Astrophysics

12 pages, to be published in Proc SPIE 7735: Ground-based & Airborne Instrumentation for Astronomy III

Scientific paper

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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