ANDES, the high resolution spectrograph for the ELT: a 30 GHz UB-band astrocomb from 390–470 nm

Yuk Shan Cheng; Kamalesh Dadi; Toby Mitchell; Samantha Thompson; Nikolai Piskunov; Lewis D. Wright; Corin B. E. Gawith; Richard A. McCracken; Derryck T. Reid

doi:10.1117/12.3013078

26 August 2024 ANDES, the high resolution spectrograph for the ELT: a 30 GHz UB-band astrocomb from 390–470 nm

Yuk Shan Cheng, Kamalesh Dadi, Toby Mitchell, Samantha Thompson, Nikolai Piskunov, Lewis D. Wright, Corin B. E. Gawith, Richard A. McCracken, Derryck T. Reid

Author Affiliations +

Proceedings Volume 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI; 131003C (2024) https://doi.org/10.1117/12.3013078
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Next generation extreme precision radial velocity (EPRV) instruments such as the ANDES spectrograph of the Extremely Large Telescope will require an unprecedentedly high-precision calibration approach, particularly in the UB band region in which the most dense stellar absorption lines are present. For this purpose, astrocombs delivering thousands of atomically referenced, evenly-spaced calibration lines across a broad spectrum have the potential to be ideal calibration sources. Here, we report a novel and effective approach to generating a laser frequency comb with a multi- GHz mode spacing covering a broad wavelength range in the UB band. The approach is based on nonlinear mixing between near-infrared ultrafast laser pulses in a MgO:PPLN waveguide. The generated 1-GHz comb, spanning 390–520 nm, was filtered to a 30 GHz sub-comb using a low-dispersion Fabry-Perot etalon. The resultant UB-band astrocomb was then captured on a lab-built cross-dispersion echelle-prism spectrograph, demonstrating well resolved comb lines across the etalon bandwidth of 392–472 nm.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yuk Shan Cheng, Kamalesh Dadi, Toby Mitchell, Samantha Thompson, Nikolai Piskunov, Lewis D. Wright, Corin B. E. Gawith, Richard A. McCracken, and Derryck T. Reid "ANDES, the high resolution spectrograph for the ELT: a 30 GHz UB-band astrocomb from 390–470 nm", Proc. SPIE 13100, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI, 131003C (26 August 2024); https://doi.org/10.1117/12.3013078

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