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The ISS (Integral-field Spectrograph System) has been designed as part of theEAGLE Phase A Instrument Study for the E-ELT. It consists of two input channelsof 1.65x1.65 arcsec field-of-view, each reconfigured spatially by animage-slicing integral-field unit to feed a single near-IR spectrograph usingcryogenic volume-phase-holographic (VPH) gratings to disperse the imagespectrally. A 4k x 4k array detector array records the dispersed images. Theoptical design employs anamorphic magnification, image slicing, VPH gratingsscanned with a novel cryo-mechanism and a three-lens camera. The mechanicalimplementation features IFU optics in Zerodur, a modular bench structure and anumber of high-precision cryo-mechanisms.

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