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Title:
Fiber IFU unit for the second generation VLT spectrograph KMOS
Authors:
Tomono, Daigo; Weisz, Harald; Hofmann, Reiner
Affiliation:
AA(Max-Planck-Institut für extraterrestrische Phyik (Germany)), AB(Ingenieurbüro für den Maschinenbau Weisz (Germany)), AC(Max-Planck-Institut für extraterrestrische Physik (Germany))
Publication:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes. Edited by Iye, Masanori; Moorwood, Alan F. M. Proceedings of the SPIE, Volume 4841, pp. 390-397 (2003). (SPIE Homepage)
Publication Date:
03/2003
Origin:
SPIE
DOI:
10.1117/12.459901
Bibliographic Code:
2003SPIE.4841..390T

Abstract

KMOS is a cryogenic multi-object near-infrared spectrograph for the VLT. It will be equipped with about 20 deployable integral field units (IFUs) which can be positioned anywhere in the 7.2 arcmin diameter field o the VLT Nasmyth focus by a cryogenic robot. We describe IFUs using micro lens arrays and optical fibers to arrange the two-dimensional fields from the IFUs on the spectrograph entrance slit. Each micro-lens array is mounted in a spider arm which also houses the pre-optics with a cold stop. The spider arms are positioned by a cryogenic robot which is built around the image plane. For the IFUs, two solutions are considered: monolithic mirco-lens arrays with fibers attached to the back where the entrance pupil is imaged, and tapered fibers with integrated lenses which are bundled together to form a lens array. The flexibility of optical fibers relaxes boundary conditions for integration of the instrument components. On the other hand, FRD and geometric characteristics of optical fibers leads to higher AΩ accepted by the spectrograph. Conceptual design of the instrument is presented as well as advantages and disadvantages of the fiber IFUs.
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