Generation of bright phase-matched circularly- polarized extreme ultraviolet high harmonics

نویسندگان

  • Ofer Kfir
  • Patrik Grychtol
  • Emrah Turgut
  • Ronny Knut
  • Dmitriy Zusin
  • Dimitar Popmintchev
  • Tenio Popmintchev
  • Hans Nembach
  • Justin M. Shaw
  • Avner Fleischer
  • Henry Kapteyn
  • Margaret Murnane
چکیده

Circularly-polarized extreme ultraviolet and X-ray radiation is useful for analysing the structural, electronic and magnetic properties of materials. To date, such radiation has only been available at large-scale X-ray facilities such as synchrotrons. Here, we demonstrate the first bright, phase-matched, extreme ultraviolet circularly-polarized high harmonics source. The harmonics are emitted when bi-chromatic counter-rotating circularly-polarized laser pulses field-ionize a gas in a hollowcore waveguide. We use this new light source for magnetic circular dichroism measurements at the M-shell absorption edges of Co. We show that phase-matching of circularly-polarized harmonics is unique and robust, producing a photon flux comparable to linearly polarized high harmonic sources. This work represents a critical advance towards the development of table-top systems for element-specific imaging and spectroscopy of multiple elements simultaneously in magnetic and other chiral media with very high spatial and temporal resolution.

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تاریخ انتشار 2015