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XUV frequency comb production with an astigmatism-compensated enhancement cavity

We have developed an extreme ultraviolet (XUV) frequency comb for performing ultra-high precision spectroscopy on the many XUV transitions found in highly charged ions (HCI). Femtosecond pulses from a 100 MHz phase-stabilized near-infrared frequency comb are amplified and then fed into a femtosecond...

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Main Authors: Nauta, Janko (Author) , Oelmann, Jan-Hendrik (Author) , Borodin, A. (Author) , Ackermann, A. (Author) , Knauer, P. (Author) , Muhammad, I (Author) , Pappenberger, Ronja (Author) , Pfeifer, Thomas (Author) , Crespo López-Urrutia, José Ramon (Author)
Format: Article (Journal)
Language:English
Published: 14 January 2021
In: Optics express
Year: 2021, Volume: 29, Issue: 2, Pages: 2624-2636
ISSN:1094-4087
DOI:10.1364/OE.414987
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1364/OE.414987
Verlag, lizenzpflichtig, Volltext: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-29-2-2624
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Author Notes:J. Nauta, J.-H. Oelmann, A. Borodin, A. Ackermann, P. Knauer, I.S. Muhammad, R. Pappenberger, T. Pfeifer, and J.R. Crespo López-Urrutia
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Summary:We have developed an extreme ultraviolet (XUV) frequency comb for performing ultra-high precision spectroscopy on the many XUV transitions found in highly charged ions (HCI). Femtosecond pulses from a 100 MHz phase-stabilized near-infrared frequency comb are amplified and then fed into a femtosecond enhancement cavity (fsEC) inside an ultra-high vacuum chamber. The low-dispersion fsEC coherently superposes several hundred incident pulses and, with a single cylindrical optical element, fully compensates astigmatism at the w0 = 15 µm waist cavity focus. With a gas jet installed there, intensities reaching ∼ 1014 W/cm2 generate coherent high harmonics with a comb spectrum at 100 MHz rate. We couple out of the fsEC harmonics from the 7th up to the 35th (42 eV; 30 nm) to be used in upcoming experiments on HCI frequency metrology.
Item Description:Gesehen am 23.02.2021
Physical Description:Online Resource
ISSN:1094-4087
DOI:10.1364/OE.414987

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