Ten-fold spectral resolution boosting using TEDI at the Mt. Palomar NIR Triplespec spectrograph

David J. Erskine; J. Edelstein; P. Muirhead; M. Muterspaugh; K. Covey; D. Mondo; A. Vanderburg; P. Andelson; D. Kimber; M. Sirk; J. Lloyd

doi:10.1117/12.892664

14 September 2011 Ten-fold spectral resolution boosting using TEDI at the Mt. Palomar NIR Triplespec spectrograph

David J. Erskine, J. Edelstein, P. Muirhead, M. Muterspaugh, K. Covey, D. Mondo, A. Vanderburg, P. Andelson, D. Kimber, M. Sirk, J. Lloyd

Author Affiliations +

Proceedings Volume 8146, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V; 81460M (2011) https://doi.org/10.1117/12.892664
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

David J. Erskine, J. Edelstein, P. Muirhead, M. Muterspaugh, K. Covey, D. Mondo, A. Vanderburg, P. Andelson, D. Kimber, M. Sirk, and J. Lloyd "Ten-fold spectral resolution boosting using TEDI at the Mt. Palomar NIR Triplespec spectrograph", Proc. SPIE 8146, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts V, 81460M (14 September 2011); https://doi.org/10.1117/12.892664

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available