Abstract
The capability of frequency-comb (FC) lasers to precisely measure optical frequencies is extended to the multiple-PHz domain. This frequency region, which covers the extreme ultraviolet (XUV, wavelengths shorter than 100 nm), was previously not accessible to these devices. Frequency comb generation is shown for 51-85 nm by amplification and coherent up-conversion of a pair of pulses originating from a near-infrared femtosecond FC laser. Moreover, Ramsey-like signals with up to 61% contrast are observed when the XUV comb is scanned over transitions in argon, neon and helium, resulting in an 8-fold improved determination of the ground state ionization energy of helium.
Original language | English |
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Title of host publication | 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 |
DOIs | |
Publication status | Published - 2011 |
Event | 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 - Istanbul, Turkey Duration: 13 Aug 2011 → 20 Aug 2011 |
Conference
Conference | 2011 30th URSI General Assembly and Scientific Symposium, URSIGASS 2011 |
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Country/Territory | Turkey |
City | Istanbul |
Period | 13/08/11 → 20/08/11 |