Even harmonic lasing

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Operation of a free-electron laser at harmonics of the fundamental frequency is explored with the numerical simulation code HELEX. This code includes coupling to the harmonics caused by misalignment of the electrons with the optical beam and coupling due to transverse gradients. Albeit weak, the transverse gradients produce the dominant coupling of the electrons to the even-harmonic light. Even-harmonic lasing occurs in a TEM{sub 0,2m+1}-like mode where the field on axis is zero. As bunching of the electron beam progresses, radiation at the higher odd harmonics is suppressed owing to the absence of higher-order odd-harmonic Fourier components in the bunch. ... continued below

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Pages: (12 p)

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Schmitt, M.J. January 1, 1991.

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Description

Operation of a free-electron laser at harmonics of the fundamental frequency is explored with the numerical simulation code HELEX. This code includes coupling to the harmonics caused by misalignment of the electrons with the optical beam and coupling due to transverse gradients. Albeit weak, the transverse gradients produce the dominant coupling of the electrons to the even-harmonic light. Even-harmonic lasing occurs in a TEM{sub 0,2m+1}-like mode where the field on axis is zero. As bunching of the electron beam progresses, radiation at the higher odd harmonics is suppressed owing to the absence of higher-order odd-harmonic Fourier components in the bunch. Growth of the even-harmonic power from small signal requires suppression of competing harmonics (including the fundamental) that have higher gain. Lasing at an even harmonic has yet to be experimentally demonstrated in an open resonator (i.e. optical cavity). Strategies to make such an experiment possible are discussed. 9 refs., 5 figs., 1 tab.

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Pages: (12 p)

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OSTI; NTIS; GPO Dep.

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  • 13. international free-electron laser (FEL) conference, Santa Fe, NM (United States), 25-30 Aug 1991

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  • Other: DE92000207
  • Report No.: LA-UR-91-3013
  • Report No.: CONF-9108118--3
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5167112
  • Archival Resource Key: ark:/67531/metadc1056454

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 22, 2018, 7:08 p.m.

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Schmitt, M.J. Even harmonic lasing, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1056454/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.