Generation of bright phase-matched circularly-polarized extreme ultraviolet high harmonics
2015 (English)In: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 9, no 2, 99-105 p.Article in journal (Refereed) PublishedText
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 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.
Place, publisher, year, edition, pages
2015. Vol. 9, no 2, 99-105 p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:uu:diva-285243OAI: oai:DiVA.org:uu-285243DiVA: diva2:921143