Generating Optical Orbital Angular Momentum in a High-Gain Free-Electron Laser at the First Harmonic

Journal Article · Fri Apr 22 00:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.164803· OSTI ID:21550325

Hemsing, E; Marinelli, A; Rosenzweig, J B ^[1]

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1. Particle Beam Physics Laboratory, Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095 (United States)

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.

• OSTI ID: 21550325
• Journal Information: Physical Review Letters, Vol. 106, Issue 16; Other Information: DOI: 10.1103/PhysRevLett.106.164803; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ELECTRON BEAMS
EMISSION
FREE ELECTRON LASERS
NOISE
OPTICAL MODES
ORBITAL ANGULAR MOMENTUM
SATURATION
VISIBLE RADIATION
WAVELENGTHS
X RADIATION
ANGULAR MOMENTUM
BEAMS
ELECTROMAGNETIC RADIATION
IONIZING RADIATIONS
LASERS
LEPTON BEAMS
OSCILLATION MODES
PARTICLE BEAMS
RADIATIONS