Characterization of orbital angular momentum modes in FEL radiation

E. Hemsing, G. Andonian, J. Rosenzweig, M. Babzien, V. Yakimenko, A. Gover

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


It is well known that Gaussian modes of paraxial light can possess orbital angular momentum (OAM) as a result of a exp(-ilφ) azimuthal angular dependence[1]. Recent experiments on the VISA free-electron laser operating as self-amplified spontaneous amplifier (SASE) at λ=840 nm have produced transverse electromagnetic radiation intensity patterns that suggest the presence of one or more OAM modes. Though the intensity profiles from VISA are compelling, work remains to discern the phase structure since OAM modes are revealed by a characteristic helical phase dependence, with a pathological singularity on axis. Here we discuss current efforts to characterize the mode content of the VISA FEL through experiments, theoretical models, and simulations. Possible methods to generate OAM modes in situ are discussed.

Original languageEnglish
Title of host publicationProceedings of the IEEE Particle Accelerator Conference, PAC07
Number of pages3
StatePublished - 2007
EventIEEE Particle Accelerator Conference, PAC07 - Albuquerque, NM, United States
Duration: 25 Jun 200729 Jun 2007

Publication series

NameProceedings of the IEEE Particle Accelerator Conference


ConferenceIEEE Particle Accelerator Conference, PAC07
Country/TerritoryUnited States
CityAlbuquerque, NM


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