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Continuous ultravio...
Continuous ultraviolet to blue-green astrocomb
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- Cheng, Yuk Shan (author)
- Heriot Watt Univ, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Scotland.
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- Dadi, Kamalesh (author)
- Heriot Watt Univ, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Scotland.
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- Mitchell, Toby (author)
- Heriot Watt Univ, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Scotland.
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- Thompson, Samantha (author)
- Cavendish Lab, Astrophys Grp, JJ Thomson Ave, Cambridge CB3 0HE, England.
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- Piskunov, Nikolai, professor, 1957- (author)
- Uppsala universitet,Observationell astrofysik
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- Wright, Lewis D. (author)
- Covesion Ltd, Unit F,Adanac North,Adanac Dr, Southampton SO16 0BT, England.
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- Gawith, Corin B. E. (author)
- Covesion Ltd, Unit F,Adanac North,Adanac Dr, Southampton SO16 0BT, England.;Univ Southampton, Optoelect Res Ctr, Southampton SO17 1BJ, Hants, England.
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- McCracken, Richard A. (author)
- Heriot Watt Univ, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Scotland.
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- Reid, Derryck T. (author)
- Heriot Watt Univ, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Scotland.
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Heriot Watt Univ, Inst Photon & Quantum Sci, Edinburgh EH14 4AS, Scotland Cavendish Lab, Astrophys Grp, JJ Thomson Ave, Cambridge CB3 0HE, England. (creator_code:org_t)
- Springer Nature, 2024
- 2024
- English.
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In: Nature Communications. - : Springer Nature. - 2041-1723. ; 15
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Abstract
Subject headings
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- 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-Perot 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 ≈100 pJ pulses, our concept establishes a new route to broadband UV-visible generation at GHz repetition rates.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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