期刊
NATURE PHOTONICS
卷 7, 期 8, 页码 608-612出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2013.156
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG) Cluster of Excellence
- Munich Centre for Advanced Photonics (MAP)
- KORONA Max-Planck-Institut fur Quantenoptik (MPQ)/Fraunhofer-Institut fur Lasertechnik (ILT) cooperation
- Bundesministerium fur Bildung und Forschung (BMBF) under PhoNa - Photonische Nanomaterialien [03IS2101B]
Coherently enhancing laser pulses in a passive cavity provides ideal conditions for high-order harmonic generation in a gas, with repetition rates around 100 MHz (refs 1-3). Recently, extreme-ultraviolet radiation with photon energies of up to 30 eV was obtained, which is sufficiently bright for direct frequency-comb spectroscopy at 20 eV (ref. 4). Here, we identify a route to scaling these radiation sources to higher photon energies. We demonstrate that the ionization-limited attainable intracavity peak intensity increases with decreasing pulse duration. By enhancing nonlinearly compressed pulses of an Yb-based laser and coupling out the harmonics through a pierced cavity mirror, we generate spatially coherent 108 eV (11.45 nm) radiation at 78 MHz. Exploiting the full potential of the demonstrated techniques will afford high-photon-flux ultrashort-pulsed extreme-ultraviolet sources for a number of applications in science and technology, including photoelectron spectroscopy, coincidence spectroscopy with femtosecond to attosecond resolution(5,6) and characterization of components and materials for nanolithography(7).
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