Creating High-Harmonic Beams with Controlled Orbital Angular Momentum

Geneviève Gariépy, Jonathan Leach, Kyung Taec Kim, T. J. Hammond, E. Frumker, Robert W Boyd, P. B. Corkum

Research output: Contribution to journalLetter

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Abstract

A beam with an angular-dependant phase about the beam axis carries an orbital angular momentum of [Math Processing Error] 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 [Math Processing Error] 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.
Original languageEnglish
Article number153901
JournalPhysical Review Letters
Volume113
Issue number15
DOIs
Publication statusPublished - 7 Oct 2014

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