Creating high-harmonic beams with controlled orbital angular momentum

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.113.153901
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume113
Issue15
Article number153901
SubjectOrbital angular momentum
AbstractA beam with an angular-dependant phase Φ=φ about the beam axis carries an orbital angular momentum of per photon. Such beams are exploited to provide superresolution in microscopy. Creating extreme ultraviolet or soft-x-ray beams with controllable orbital angular momentum is a critical step towards extending superresolution to much higher spatial resolution. We show that orbital angular momentum is conserved during high-harmonic generation. Experimentally, we use a fundamental beam with | =1 and interferometrically determine that the harmonics each have orbital angular momentum equal to their harmonic number. Theoretically, we show how any small value of orbital angular momentum can be coupled to any harmonic in a controlled manner. Our results open a route to microscopy on the molecular, or even submolecular, scale. © 2014 American Physical Society.
Publication date
LanguageEnglish
AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21276161
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Record identifier1b6b2449-d349-4e65-87f2-5b45b4f22f55
Record created2015-09-28
Record modified2016-05-09
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