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Generation of bright phase-matched circularly-polarized extreme ultraviolet high harmonics
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2015 (English)In: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 9, no 2, 99-105 p.Article in journal (Refereed) Published
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Abstract [en]

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.

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2015. Vol. 9, no 2, 99-105 p.
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Atom and Molecular Physics and Optics
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URN: urn:nbn:se:uu:diva-285243OAI: oai:DiVA.org:uu-285243DiVA: diva2:921143
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Article

Available from: 2016-04-19 Created: 2016-04-19 Last updated: 2017-11-30

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http://dx.doi.org/10.1038/nphoton.2014.293

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Knut, Ronny

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