@inproceedings{82af6cf8b08345d89f1233555b38049f,
title = "ANDES, the high-resolution spectrograph for the ELT: a 30 GHz UB-band astrocomb from 390-470 nm",
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.",
keywords = "Astrocomb, MgO:PPLN waveguide, sum-frequency-mixing, Ti:sapphire laser",
author = "Cheng, {Yuk Shan} and Kamalesh Dadi and Toby Mitchell and Samantha Thompson and Nikolai Piskunov and Wright, {Lewis D.} and Gawith, {Corin B. E.} and McCracken, {Richard A.} and Reid, {Derryck T.}",
note = "Publisher Copyright: {\textcopyright} 2024 SPIE.; SPIE Astronomical Telescopes + Instrumentation 2024 ; Conference date: 16-06-2024 Through 21-06-2024",
year = "2024",
month = aug,
day = "26",
doi = "10.1117/12.3013078",
language = "English",
isbn = "9781510675230",
series = "Proceedings of SPIE",
publisher = "SPIE",
editor = "Ramon Navarro and Ralf Jedamzik",
booktitle = "Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation VI",
address = "United States",
}