TY  - JOUR
AU  - Ludwig, Markus
AU  - Ayhan, Furkan
AU  - Schmidt, Tobias M.
AU  - Wildi, Thibault
AU  - Voumard, Thibault
AU  - Blum, Roman
AU  - Ye, Zhichao
AU  - Lei, Fuchuan
AU  - Wildi, François
AU  - Pepe, Francesco
AU  - Gaafar, Mahmoud A.
AU  - Obrzud, Ewelina
AU  - Grassani, Davide
AU  - Moreau, François
AU  - Chazelas, Bruno
AU  - Sottile, Rico
AU  - Torres-Company, Victor
AU  - Brasch, Victor
AU  - Villanueva, Luis G.
AU  - Bouchy, François
AU  - Herr, Tobias
TI  - Ultraviolet astronomical spectrograph calibration with laser frequency combs from nanophotonic lithium niobate waveguides
JO  - Nature Communications
VL  - 15
IS  - 1
SN  - 2041-1723
CY  - [London]
PB  - Nature Publishing Group UK
M1  - PUBDB-2024-05459
SP  - 7614
PY  - 2024
AB  - Astronomical precision spectroscopy underpins searches for life beyond Earth, direct observation of the expanding Universe and constraining the potential variability of physical constants across cosmological scales. Laser frequency combs can provide the critically required accurate and precise calibration to the astronomical spectrographs. For cosmological studies, extending the calibration with such astrocombs to the ultraviolet spectral range is highly desirable, however, strong material dispersion and large spectral separation from the established infrared laser oscillators have made this exceedingly challenging. Here, we demonstrate for the first time astronomical spectrograph calibrations with an astrocomb in the ultraviolet spectral range below 400 nm. This is accomplished via chip-integrated highly nonlinear photonics in periodically-poled, nano-fabricated lithium niobate waveguides in conjunction with a robust infrared electro-optic comb generator, as well as a chip-integrated microresonator comb. These results demonstrate a viable route towards astronomical precision spectroscopy in the ultraviolet and may contribute to unlocking the full potential of next generation ground- and future space-based astronomical instruments.
LB  - PUB:(DE-HGF)16
C6  - 39223131
UR  - <Go to ISI:>//WOS:001304177200014
DO  - DOI:10.1038/s41467-024-51560-x
UR  - https://bib-pubdb1.desy.de/record/612774
ER  -