Circular polarization with crossed-planar undulators in high gain FELs.

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We propose a crossed undulator configuration for a high-gain free-electron laser to allow versatile polarization control. This configuration consists of a long (saturation length) planar undulator, a dispersive section, and a short (a few gain lengths) planar undulator oriented perpendicular to the first one. In the first undulator, a radiation component linearly polarized in the x-direction is amplified to saturation. In the second undulator, the x-polarized component propagates freely, while a new component, polarized in the y-direction, is generated and reaches saturation in a few gain lengths. By adjusting the strength of the dispersive section, the relative phase of two ... continued below

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10 p.

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Kim, K.-J. August 31, 1999.

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Description

We propose a crossed undulator configuration for a high-gain free-electron laser to allow versatile polarization control. This configuration consists of a long (saturation length) planar undulator, a dispersive section, and a short (a few gain lengths) planar undulator oriented perpendicular to the first one. In the first undulator, a radiation component linearly polarized in the x-direction is amplified to saturation. In the second undulator, the x-polarized component propagates freely, while a new component, polarized in the y-direction, is generated and reaches saturation in a few gain lengths. By adjusting the strength of the dispersive section, the relative phase of two radiation components can be adjusted to obtain a suitable polarization for the total radiation field, including the circular polarization. The operating principle of the high-gain crossed undulator, which is quite different from that of the crossed undulator for spontaneous radiation, is illustrated in terms of 1-D FEL theory.

Physical Description

10 p.

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INIS; OSTI as DE00011933

Medium: P; Size: 10 pages

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  • 21st International Free Electron Laser Conference, Hamburg (DE), 08/23/1999--08/28/1999

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  • Report No.: ANL/ASD/CP-99801
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11933
  • Archival Resource Key: ark:/67531/metadc627691

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  • August 31, 1999

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 6, 2017, 6:40 p.m.

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Kim, K.-J. Circular polarization with crossed-planar undulators in high gain FELs., article, August 31, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc627691/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.