9 August 2016 First light of a laser frequency comb at SALT
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Abstract
We present preliminary results of the commissioning and testing of SALT-CRISP (SALT-Calibration Ruler for Increased Spectrograph Precision), a Laser Frequency Comb (LFC) built by Heriot-Watt University and temporarily installed at the Southern African Large Telescope (SALT). The comb feeds the High Stability mode of SALT's High Resolution Spectrograph (HRS) and fully covers the wavelength range of the red channel of the HRS: 555-890 nm. The LFC provides significantly improved wavelength calibration compared to a standard Thorium-Argon (ThAr) lamp and hence offers unprecedented opportunities to characterise the resolution, stability and radial velocity precision of the HRS. Results from this field trial will be incorporated into subsequent LFC designs.
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Éric Depagne, Éric Depagne, Richard A. McCracken, Richard A. McCracken, Derryck T. Reid, Derryck T. Reid, Rudi B. Kuhn, Rudi B. Kuhn, Nicolas Erasmus, Nicolas Erasmus, Lisa A. Crause, Lisa A. Crause, } "First light of a laser frequency comb at SALT", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 99087M (9 August 2016); doi: 10.1117/12.2245048; https://doi.org/10.1117/12.2245048
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