XUV frequency comb production with an astigmatism-compensated enhancement cavity

• Verfasst von: Nauta, Janko [VerfasserIn]
• Verfasst von: Oelmann, Jan-Hendrik [VerfasserIn]
• Verfasst von: Borodin, A. [VerfasserIn]
• Verfasst von: Ackermann, A. [VerfasserIn]
• Verfasst von: Knauer, P. [VerfasserIn]
• Verfasst von: Muhammad, I [VerfasserIn]
• Verfasst von: Pappenberger, Ronja [VerfasserIn]
• Verfasst von: Pfeifer, Thomas [VerfasserIn]
• Verfasst von: Crespo López-Urrutia, José Ramon [VerfasserIn]
• Titel: XUV frequency comb production with an astigmatism-compensated enhancement cavity
• Verf.angabe: J. Nauta, J.-H. Oelmann, A. Borodin, A. Ackermann, P. Knauer, I.S. Muhammad, R. Pappenberger, T. Pfeifer, and J.R. Crespo López-Urrutia
• E-Jahr: 2021
• Jahr: 14 January 2021
• Umfang: 13 S.
• Fussnoten: Gesehen am 23.02.2021
• Titel Quelle: Enthalten in: Optics express
• Ort Quelle: Washington, DC : Optica, 1997
• Jahr Quelle: 2021
• Band/Heft Quelle: 29(2021), 2, Seite 2624-2636
• ISSN Quelle: 1094-4087
• DOI: doi:10.1364/OE.414987
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1749170302

Abstract

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.