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Sökning: WFRF:(Durfee Charles)

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1.
  • Hickstein, Daniel D., et al. (författare)
  • Non-collinear generation of angularly isolated circularly polarized high harmonics
  • 2015
  • Ingår i: Nature Photonics. - 1749-4885 .- 1749-4893. ; 9:11, s. 743-750
  • Tidskriftsartikel (refereegranskat)abstract
    • We generate angularly isolated beams of circularly polarized extreme ultraviolet light through the first implementation of non-collinear high harmonic generation with circularly polarized driving lasers. This non-collinear technique offers numerous advantages over previous methods, including the generation of higher photon energies, the separation of the harmonics from the pump beam, the production of both left and right circularly polarized harmonics at the same wavelength and the capability of separating the harmonics without using a spectrometer. To confirm the circular polarization of the beams and to demonstrate the practicality of this new light source, we measure the magnetic circular dichroism of a 20 nm iron film. Furthermore, we explain the mechanisms of non-collinear high harmonic generation using analytical descriptions in both the photon and wave models. Advanced numerical simulations indicate that this non-collinear mixing enables the generation of isolated attosecond pulses with circular polarization.
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2.
  • Miranda, Miguel, et al. (författare)
  • Measurement and correction of spectral phase in a few-cycle parametric amplifier
  • 2018
  • Ingår i: Ultrafast Optics 2017 : Abstract Book - Abstract Book. - 0277-786X .- 1996-756X. - 9781510617162 ; 10606, s. 75-75
  • Konferensbidrag (refereegranskat)abstract
    • We study the spectral phase introduced by parametric amplification and how high extraction efficiency of energy leads to deterioration of the phase. Avoiding this regime, and using a pulse shaper, we achieve high-contrast ultrashort pulses.
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