Journal
OPTICS LETTERS
Volume 38, Issue 23, Pages 5051-5054Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.38.005051
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- German Federal Ministry of Education and Research (BMBF)
- European Research Council under European Union [240460]
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We present a tabletop source of coherent soft x-ray radiation with high-photon flux. Two-cycle pulses delivered by a fiber-laser-pumped optical parametric chirped-pulse amplifier operating at 180 kHz repetition rate are upconverted via high harmonic generation in neon to photon energies beyond 200 eV. A maximum photon flux of 1.3 . 10(8) photons/s is achieved within a 1% bandwidth at 125 eV photon energy. This corresponds to a conversion efficiency of similar to 10(-9), which can be reached due to a gas jet simultaneously providing a high target density and phase matching. Further scaling potential toward higher photon flux as well as higher photon energies are discussed. (C) 2013 Optical Society of America
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