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Proceedings Paper

EXES: an echelon cross echelle spectrograph for SOFIA
Author(s): Matthew J. Richter; John H. Lacy; Daniel T. Jaffe; Mary Kay Hemenway; Wanglong Yu
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Paper Abstract

To study narrow features in quiescent molecular clouds, a high spectral resolution, high sensitivity instrument is required. We present the design and capabilities of a mid-IR spectrograph being built as a PI instrument for the Stratospheric Observatory for IR Astronomy. The Echelon- Cross-Echelle Spectrograph (EXES) will operate from 5.5-28.5 micrometers in three spectroscopic modes: R approximately 105, 104, and 1500. EXES is similar in concept to our ground based instrument, TEXES. EXES consists of three chambers. The first chamber contains focal-reducing optics. The second chamber houses the high resolution grating, an echelon. Discussion of the echelon can be found elsewhere in this volume. The third chamber contains an echelle grating and a first order grating mounted back-to-back. A flip mirror selects operating mode by either directing light into the echelon chamber or allowing the light to pass through to the grating chamber. Re-imaging optics upstream of the detector provide two plate scales. The detector, a 256 by 256 pixel Si:As IBC, is in a baffled subsection of the third chamber. Finally, the low resolution grating serves as a slit positioning camera when it is rotated face on.

Paper Details

Date Published: 21 August 1998
PDF: 11 pages
Proc. SPIE 3354, Infrared Astronomical Instrumentation, (21 August 1998); doi: 10.1117/12.317299
Show Author Affiliations
Matthew J. Richter, Univ. of Texas/Austin (United States)
John H. Lacy, Univ. of Texas/Austin (United States)
Daniel T. Jaffe, Univ. of Texas/Austin (United States)
Mary Kay Hemenway, Univ. of Texas/Austin (United States)
Wanglong Yu, Univ. of Texas/Austin (United States)

Published in SPIE Proceedings Vol. 3354:
Infrared Astronomical Instrumentation
Albert M. Fowler, Editor(s)

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