Continuous ultraviolet to blue-green astrocomb

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 ()
Additional contact information
Yuk Shan Cheng: Heriot-Watt University
Kamalesh Dadi: Heriot-Watt University
Toby Mitchell: Heriot-Watt University
Samantha Thompson: J.J. Thomson Avenue
Nikolai Piskunov: Uppsala University
Lewis D. Wright: Covesion Ltd, Unit F3, Adanac North, Adanac Drive, Nursling
Corin B. E. Gawith: Covesion Ltd, Unit F3, Adanac North, Adanac Drive, Nursling
Richard A. McCracken: Heriot-Watt University
Derryck T. Reid: Heriot-Watt University

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Cosmological and exoplanetary science using transformative telescopes like the ELT will demand precise calibration of astrophysical spectrographs in the blue-green, where stellar absorption lines are most abundant. Astrocombs—lasers providing a broadband sequence of regularly-spaced optical frequencies on a multi-GHz grid—promise an atomically-traceable calibration scale, but their realization in the blue-green is challenging for current infrared-laser-based technology. Here, we introduce a concept achieving a broad, continuous spectrum by combining second-harmonic generation and sum-frequency-mixing in an MgO:PPLN waveguide to generate 390–520 nm light from a 1 GHz Ti:sapphire frequency comb. Using a Fabry-Pérot filter, we extract a 30 GHz sub-comb spanning 392–472 nm, visualizing its thousands of modes on a high-resolution spectrograph. Experimental data and simulations demonstrate how the approach can bridge the spectral gap present in second-harmonic-only conversion. Requiring only $$\approx$$ ≈ 100 pJ pulses, our concept establishes a new route to broadband UV-visible generation at GHz repetition rates.

Date: 2024
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DOI: 10.1038/s41467-024-45924-6

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