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Express"],"published-print":{"date-parts":[[2021,1,18]]},"abstract":"<jats:p>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\u2009MHz 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 <jats:italic toggle=\"yes\">w<\/jats:italic><jats:sub>0<\/jats:sub>\u2009=\u200915\u2009<jats:italic toggle=\"yes\">\u00b5<\/jats:italic>m waist cavity focus. With a gas jet installed there, intensities reaching \u223c\u200910<jats:sup>14<\/jats:sup>\u2009W\/cm<jats:sup>2<\/jats:sup> generate coherent high harmonics with a comb spectrum at 100\u2009MHz rate. We couple out of the fsEC harmonics from the 7th up to the 35th (42\u2009eV; 30\u2009nm) to be used in upcoming experiments on HCI frequency metrology.<\/jats:p>","DOI":"10.1364\/oe.414987","type":"journal-article","created":{"date-parts":[[2020,12,21]],"date-time":"2020-12-21T12:00:06Z","timestamp":1608552006000},"page":"2624","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":30,"title":["XUV frequency comb production with an astigmatism-compensated enhancement cavity"],"prefix":"10.1364","volume":"29","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3477-7104","authenticated-orcid":true,"given":"J.","family":"Nauta","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.-H.","family":"Oelmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Borodin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Ackermann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Knauer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"I. 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