Accession Number : ADA619293


Title :   Generation of Bright Phase-matched Circularly-polarized Extreme Ultraviolet High Harmonics


Descriptive Note : Journal article


Corporate Author : COLORADO UNIV AT BOULDER DEPT OF PHYSICS


Personal Author(s) : Kfir, Ofer ; Grychtol, Patrik ; Turgut, Emrah ; Knut, Ronny ; Zusin, Dmitriy ; Popmintchev, Dimitar ; Popmintchev, Tenio ; Nembach, Hans ; Shaw, Justin M ; Fleischer, Avner


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a619293.pdf


Report Date : 08 Dec 2014


Pagination or Media Count : 17


Abstract : 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 hollow-core 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 fl ux 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.


Descriptors :   *BRIGHTNESS , *HARMONICS , *PHOTONICS , *POLARIZATION , ABSORPTION , BANDWIDTH , CIRCULAR , COMPUTERIZED SIMULATION , COUPLING(INTERACTION) , DIFFRACTION ANALYSIS , ELECTROMAGNETIC PROPERTIES , ELECTRONICS , EXPERIMENTAL DESIGN , GASES , INTERACTIONS , LASER BEAMS , LIGHT SOURCES , LINEARITY , MAGNETIC MATERIALS , MAGNETIC PROPERTIES , NONLINEAR SYSTEMS , PHOTOELECTRON SPECTRA , SPATIAL DISTRIBUTION , SPECTROSCOPY , ULTRAVIOLET RADIATION , WAVEGUIDES , X RAYS


Subject Categories : Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy
      Optics
      Solid State Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE