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Proceedings Paper

Ten-fold spectral resolution boosting using TEDI at the Mt. Palomar NIR Triplespec spectrograph
Author(s): David J. Erskine; J. Edelstein; P. Muirhead; M. Muterspaugh; K. Covey; D. Mondo; A. Vanderburg; P. Andelson; D. Kimber; M. Sirk; J. Lloyd
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Paper Abstract

An optical technique called "interferometric spectral reconstruction" (ISR) is capable of increasing a spectrograph's resolution and stability by large factors, well beyond its classical limits. We have demonstrated a 6- to 11-fold increase in the Triplespec effective spectral resolution (R=2,700) to achieve R=16,000 at 4100 cm-1to 30,000 at 9600 cm-1 by applying special Fourier processing to a series of exposures with different delays (optical path differences) taken with the TEDI interferometer and the near-infrared Triplespec spectrograph at the Mt. Palomar Observatory 200 inch telescope. The TEDI is an externally dispersed interferometer (EDI) used for Doppler radial velocity measurements on M-stars, and now also used for ISR. The resolution improvement is observed in both stellar and telluric features simultaneously over the entire spectrograph bandwidth (0.9-2.45 μm). By expanding the delay series, we anticipate achieving resolutions of R=45,000 or more. Since the delay is not continuously scanned, the technique is advantageous for measuring time-variable phenomena or in varying conditions (e.g. planetary fly-bys). The photon limited signal to noise ratio can be 100 times better than a classic Fourier Transform Spectrometer (FTS) due to the benefit of dispersion.

Paper Details

Date Published: 15 September 2011
PDF: 10 pages
Proc. SPIE 8146, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V, 81460M (15 September 2011); doi: 10.1117/12.892664
Show Author Affiliations
David J. Erskine, Lawrence Livermore National Lab. (United States)
J. Edelstein, Univ. of California, Berkeley (United States)
P. Muirhead, California Institute of Technology (United States)
M. Muterspaugh, Tennessee State Univ. (United States)
K. Covey, Cornell Univ. (United States)
D. Mondo, Univ. of California, Berkeley (United States)
A. Vanderburg, Univ. of California, Berkeley (United States)
P. Andelson, Univ. of California, Berkeley (United States)
D. Kimber, Univ. of California, Berkeley (United States)
M. Sirk, Univ. of California, Berkeley (United States)
J. Lloyd, Cornell Univ. (United States)


Published in SPIE Proceedings Vol. 8146:
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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