20 July 2010 Astro-comb calibration of an Echelle Spectrograph
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We describe recent work calibrating a cross-dispersed spectrograph with an "astro-comb" i.e., a high repetition rate, octave spanning femtosecond laser frequency comb; and a filter cavity suppressing laser modes to match the resolution of the spectrograph. Our astro-comb provides ~1500 evenly spaced (~0.6 A) calibration lines of roughly 100 nW per line between 7800 and 8800 Angstroms. The calibration lines of the laser are stabilized to atomic clocks which can be referenced to GPS providing intrinsic stability of the source laser below 1 cm/s in stellar radial velocity sensitivity, as well as long term stability and reproducibility over years. We present calibration of the TRES spectrograph at the 1.5 m telescope at the Fred L Whipple Observatory below 1 m/s radial velocity sensitivity in six orders from 7800-8800 A.
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C.-H. Li, C.-H. Li, D. F. Phillips, D. F. Phillips, A. G. Glenday, A. G. Glenday, A. J. Benedick, A. J. Benedick, G. Chang, G. Chang, L.-J. Chen, L.-J. Chen, C. Cramer, C. Cramer, G. Furesz, G. Furesz, F. X. Kärtner, F. X. Kärtner, D. Sasselov, D. Sasselov, A. Szentgyorgyi, A. Szentgyorgyi, R. L. Walsworth, R. L. Walsworth, } "Astro-comb calibration of an Echelle Spectrograph", Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77354O (20 July 2010); doi: 10.1117/12.857534; https://doi.org/10.1117/12.857534

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