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Proceedings Article

Performance of large chemically etched silicon grisms for infrared spectroscopy

[+] Author Affiliations
D. J. Mar, J. P. Marsh, D. T. Jaffe

Univ. of Texas at Austin

L. D. Keller

Ithaca College

K. A. Ennico

NASA-Ames Research Ctr.

Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62695R (June 27, 2006); doi:10.1117/12.671728
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From Conference Volume 6269

  • Ground-based and Airborne Instrumentation for Astronomy
  • Ian S. McLean; Masanori Iye
  • Orlando, Florida , USA | May 24, 2006

abstract

FORCAST is a mid/far-IR camera for use on NASA's SOFIA airborne observatory. We are fabricating monolithic silicon grisms to retrofit a spectroscopic capability for this facility-class instrument without affecting the imaging optics. The grisms will operate in the 5-8, 17-28, and 28-37 μm wavelength ranges. We will cover the 5-8 μm range in one exposure at a resolving power R =1200 with a 2 arcsecond slit using two grisms with one serving as a cross-disperser. For the 17-28 and 28-37 μm ranges, the resolving powers are R ~140, 250 when used in low order with a slit of 3 arcseconds. We illustrate aspects of fabrication and testing during the grism development, and summarize the performance of the gratings at near- and mid-IR wavelengths. These gratings rely on procedures that can be used for modest sized (~10 cm) silicon pieces, thereby providing dispersive elements with good optical performance and large slit width-resolving power products from 1.2-8.1 μm and beyond 17 μm.

© (2006) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

D. J. Mar ; J. P. Marsh ; D. T. Jaffe ; L. D. Keller and K. A. Ennico
"Performance of large chemically etched silicon grisms for infrared spectroscopy", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62695R (June 27, 2006); doi:10.1117/12.671728; http://dx.doi.org/10.1117/12.671728


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