Generating optical orbital angular momentum in a high-gain free-electron laser at the first harmonic

A scheme to generate intense coherent light that carries orbital angular momentum (OAM) at the fundamental wavelength of an x-ray free-electron laser (FEL) is described. The OAM light is emitted as the dominant mode of the system until saturation provided that the helical microbunching imposed on th...

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Veröffentlicht in:Physical review letters 2011-04, Vol.106 (16), p.164803-164803, Article 164803
Hauptverfasser: Hemsing, E, Marinelli, A, Rosenzweig, J B
Format: Artikel
Sprache:eng
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Zusammenfassung:A scheme to generate intense coherent light that carries orbital angular momentum (OAM) at the fundamental wavelength of an x-ray free-electron laser (FEL) is described. The OAM light is emitted as the dominant mode of the system until saturation provided that the helical microbunching imposed on the electron beam is larger than the shot-noise bunching that leads to self-amplified emission. Operating at the fundamental, this scheme is more efficient than alternate schemes that rely on harmonic emission, and can be applied to x-ray FELs without using external optical mode conversion elements.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.106.164803