Coherent infrared radiation from the ALS generated via femtosecond laser modulation of the electron beam

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Interaction of an electron beam with a femtosecond laser pulse co-propagating through a wiggler at the ALS produces large modulation of the electron energies within a short {approx}100 fs slice of the electron bunch. Propagating around the storage ring, this bunch develops a longitudinal density perturbation due to the dispersion of electron trajectories. The length of the perturbation evolves with a distance from the wiggler but is much shorter than the electron bunch length. This perturbation causes the electron bunch to emit short pulses of temporally and spatially coherent infrared light which are automatically synchronized to the modulating laser. The ... continued below

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3 pages

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Byrd, J.M.; Hao, Z.; Martin, M.C.; Robin, D.S.; Sannibale, F.; Schoenlein, R.W. et al. July 1, 2004.

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Interaction of an electron beam with a femtosecond laser pulse co-propagating through a wiggler at the ALS produces large modulation of the electron energies within a short {approx}100 fs slice of the electron bunch. Propagating around the storage ring, this bunch develops a longitudinal density perturbation due to the dispersion of electron trajectories. The length of the perturbation evolves with a distance from the wiggler but is much shorter than the electron bunch length. This perturbation causes the electron bunch to emit short pulses of temporally and spatially coherent infrared light which are automatically synchronized to the modulating laser. The intensity and spectra of the infrared light were measured in two storage ring locations for a nominal ALS lattice and for an experimental lattice with the higher momentum compaction factor. The onset of instability stimulated by laser e-beam interaction had been discovered. The infrared signal is now routinely used as a sensitive monitor for a fine tuning of the laser beam alignment during data accumulation in the experiments with femtosecond x-ray pulses.

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3 pages

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INIS; OSTI as DE00836045

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  • 9th Biennial European Particle Accelerator Conference, EPAC'04, Lucerne (CH), 07/05/2004--07/09/2004

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  • Report No.: LBNL--55688
  • Report No.: CBP Note - 572
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 836045
  • Archival Resource Key: ark:/67531/metadc784976

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  • July 1, 2004

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  • Dec. 3, 2015, 9:30 a.m.

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  • Sept. 1, 2016, 7:11 p.m.

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Byrd, J.M.; Hao, Z.; Martin, M.C.; Robin, D.S.; Sannibale, F.; Schoenlein, R.W. et al. Coherent infrared radiation from the ALS generated via femtosecond laser modulation of the electron beam, article, July 1, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc784976/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.