An optical spectrograph design for a new-generation multiple object Doppler instrument

Bo Zhao; Jian Ge

doi:10.1117/12.670862

30 June 2006 An optical spectrograph design for a new-generation multiple object Doppler instrument

Bo Zhao, Jian Ge

Proceedings Volume 6269, Ground-based and Airborne Instrumentation for Astronomy; 62692U (2006) https://doi.org/10.1117/12.670862
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

This paper describes an optical spectrograph design for the W.M. Keck Exoplanet Tracker (ET) multi-object Doppler radial velocity instrument. The Keck ET is currently installed at the Sloan 2.5m telescope (Ge et al. this proceedings), and is capable of simultaneously monitoring 60 stars with high precision for a planet survey. The spectrograph consists of an entrance slit, collimator optics, a Volume Phase Holographic (VPH) grating, camera optics and a 4kx4k CCD camera, and provides a spectral resolution of R =5000, with a 180 mm diameter collimated beam. The collimator and camera optics (300 mm largest diameter) are made of two standard optical grade glasses: BK7 and F2, respectively. The spectrograph is transmissive and optimized for delivering high throughput and high image quality over the entire operation bandwidth: 500-590 nm. The f/4 input beams from the Keck ET interferometer are converted to f/1.5 beams on the detector by this spectrograph, and form 60 stellar fringe spectra.

Citation Download Citation

Bo Zhao and Jian Ge "An optical spectrograph design for a new-generation multiple object Doppler instrument", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62692U (30 June 2006); https://doi.org/10.1117/12.670862

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