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Generation of high-photon flux-coherent soft x-ray radiation with few-cycle pulses

 
: Demmler, Stefan; Rothhardt, Jan; Hädrich, Steffen; Krebs, Manuel; Hage, Arvid; Limpert, Jens; Tünnermann, Andreas

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Optics Letters 38 (2013), No.23, pp.5051-5054
ISSN: 0146-9592
English
Journal Article
Fraunhofer IOF ()

Abstract
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 1.3x10 to the power of 8 photons/s is achieved within a 1% bandwidth at 125 eV photon energy. This corresponds to a conversion efficiency of ~10 to the power of -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.

: http://publica.fraunhofer.de/documents/N-267125.html