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Proceedings Paper

High resolution absorption spectroscopy using externally dispersed interferometry
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Paper Abstract

We describe the use of Externally Dispersed Interferometry (EDI) for high-resolution absorption spectroscopy. By adding a small fixed-delay interferometer to a dispersive spectrograph, a precise fiducial grid in wavelength is created over the entire spectrograph bandwidth. The fiducial grid interacts with narrow spectral features in the input spectrum to create a moire pattern. EDI uses the moire pattern to obtain new information about the spectra that is otherwise unavailable, thereby improving spectrograph performance. We describe the theory and practice of EDI spectrometers and demonstrate improvements in the spectral resolution of conventional spectrographs by a factor of 2 to 6. The improvement of spectral resolution offered by EDI can readily benefit space instruments operating from the near IR to the far UV by reducing spectrograph size or increasing instantaneous bandwidth.

Paper Details

Date Published: 18 August 2005
PDF: 11 pages
Proc. SPIE 5898, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV, 589811 (18 August 2005); doi: 10.1117/12.618061
Show Author Affiliations
Jerry Edelstein, Univ. of California, Berkeley (United States)
David J. Erskine, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 5898:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV
Oswald H. W. Siegmund, Editor(s)

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