Conceptual design for the High Resolution Optical Spectrograph on the Thirty-Meter Telescope: a new concept for a ground-based high-resolution optical spectrograph

Cynthia Froning; Steven Osterman; Matthew Beasley; James Green; Stephane Beland

doi:10.1117/12.669358

29 June 2006 Conceptual design for the High Resolution Optical Spectrograph on the Thirty-Meter Telescope: a new concept for a ground-based high-resolution optical spectrograph

Cynthia Froning, Steven Osterman, Matthew Beasley, James Green, Stephane Beland

Author Affiliations +

Proceedings Volume 6269, Ground-based and Airborne Instrumentation for Astronomy; 62691V (2006) https://doi.org/10.1117/12.669358
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

We present a conceptual design for a High Resolution Optical Spectrograph (HROS) for the Thirty Meter Telescope, a 30-m primary aperture ground-based telescope currently under development (www.tmt.org). To decouple downstream optics sizes from the size of the seeing disk and/or AO performance, we use fiber fed IFUs to generate a 0.1" pseudo-slit. The use of multiple IFUs instead of a slit also allows for spatially resolved spectroscopy, multi-object spectroscopy, positionable sky sampling, and insertion of a simultaneous wavelength calibration signal into the beam. Instead of a cross-dispersed echelle design, our concept uses a dichroic tree to provide spectral separation. The dichroics feed 32 independent first-order spectrographs that cover the 310 to 1100 nm optical waveband at a nominal spectral resolution of R=100,000. This approach allows for the optimization of coatings and on-blaze grating performance in each channel, resulting in high efficiency, near-uniform dispersion, and reduced program risk and cost due to the high degree of component commonality. We also discuss the general applicability of this concept for achieving high resolution spectroscopy in the next generation of ground-based instrumentation.

Citation Download Citation

Cynthia Froning, Steven Osterman, Matthew Beasley, James Green, and Stephane Beland "Conceptual design for the High Resolution Optical Spectrograph on the Thirty-Meter Telescope: a new concept for a ground-based high-resolution optical spectrograph", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62691V (29 June 2006); https://doi.org/10.1117/12.669358

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