Test of a 34 GHz EOM laser frequency comb at ESPRESSO
Tobias M. Schmidt, Ewelina Obrzud, Fran\c{c}ois Bouchy, Gaspare Lo Curto, Victor Brasch, Tobias Herr, Furkan Ayhan, Severine Denis, Davide Grassani, Jean Berney, Bruno Chazelas, Weichen Fan, Jannis Holzer, Ian Hughes, Markus Ludwig, Antonio Manescau, Luca Pasquini

TL;DR
This study tests a 34 GHz electro-optic modulation laser frequency comb with the ESPRESSO spectrograph, demonstrating its potential for precise wavelength calibration but highlighting calibration challenges due to instrument misalignments.
Contribution
First detailed test of a 34 GHz EOM laser frequency comb with ESPRESSO, analyzing spectral quality, calibration accuracy, and stability, and identifying instrument alignment issues.
Findings
Achieved wavelength calibration stability of 17 cm/s
Detected calibration discrepancies up to 15 m/s due to instrument misalignments
Highlighted the importance of advanced data analysis for LFC spectra
Abstract
Laser frequency combs (LFCs) are a promising technology for wavelength calibration of astronomical high-resolution spectrographs requiring utmost accuracy and stability, since they directly translate the fundamental SI time standard from the radio frequency regime to optical frequencies. However, they have so far seen limited use in practice, due to their complexity, incomplete wavelength coverage, but also the challenges in the data analysis they imply. Here, we present a detailed test of a 34 GHz electro-optic modulation comb with the ESPRESSO spectrograph. Using thin-film lithum-niobate waveguides for broadening and harmonic generation, the setup provides partial coverage of the IR, visible, and near-UV spectral ranges. We focus on assessing the quality of the delivered spectra and their capability to facilitate accurate and stable wavelength calibration. We present a detailed…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsAdvanced Fiber Laser Technologies · Advanced Frequency and Time Standards · Pulsars and Gravitational Waves Research
