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ELECTRON DYNAMICS AND HARMONIC GENERATION IN THE FREE-ELECTRON LASER.AL-ABAWI, HAZIM YOUNIS. January 1982 (has links)
The free-electron laser (FEL) is a device for converting kinetic energy in a relativistic electron beam directly into laser light. A classical theory of the FEL is discussed. This theory uses the Boltzmann distribution to describe the electrons and Maxwell equation to describe the evolution of the laser field. The harmonic expansion of the Boltzmann equation leads to a set of "quasi-Bloch" equations describing the electron distribution. The behavior of the momentum distribution is discussed theoretically in the small-signal regime of the FEL. The distribution function changes in nontrivial ways. The electron distribution does not only experience a recoil, but is also subject to spread through the amplification process. The recoil plays a relatively minor role compared to the spread. This behavior of the electron distribution may play an important role in the efficiency of the FEL. Free-electron lasers, except for those using helical wigglers, are predicted in most cases to generate higher harmonics, of the fundamental optical frequency, in the forward direction. The basic equations describing this process are derived by using the multiple-scaling perturbation theory, which leads to the slowly-varying Maxwell and Boltzmann equations. Harmonic generation in the FEL offers a possible means to extend the wavelength range of the device towards high frequency. Numerical calculations are shown for CW operation using a linearly polarized wiggler. Higher harmonic emission becomes enhanced as the magnetic field is increased and as the energy spread in the electron beam is reduced. Coherent pulse propagation in the picosecond pulse regime of the FEL is treated. Coherent transient effects such as laser lethargy are discussed. The effect of laser lethargy is seen to play an important role in the pulsed FEL, as it does in conventional swept-gain amplifiers based on an atomic medium. Numerical calculations of the harmonics in the pulsed FEL are presented. The optical pulses show a ringing behavior which is sensitive to the reflectivity of the cavity mirrors and to the electron current.
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The gain characteristics and the growing stimulating laser wave of a free electron laser.January 1989 (has links)
by Ip Tak-wa. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1989. / Bibliography: leaves 62-64.
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Electron motion & stability in a wiggler field.January 1989 (has links)
by Chan, Siu Cheung. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1989. / Bibliography: leaves 65.
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Megawatt class free electron lasers for naval application-short Rayleigh length and stability analysis /Ossenfort, William J. January 2002 (has links) (PDF)
Thesis (M.S. in Physics)--Naval Postgraduate School, December 2002. / Thesis advisor(s): William B. Colson, Robert L. Armstead. Includes bibliographical references (p. 97-99). Also available online.
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On the radiation fields of scattered laser light by an electron and study of absorption spectrum of Dy:LaCl = Dy:LaCl.January 1986 (has links)
by Wong Tong Pak. / Bibliography: leaves 188-189 / Thesis (M.Ph.)--Chinese University of Hong Kong, 1986
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A single-particle theory of a free-electron laser amplifier.January 1989 (has links)
by Cheung Chin Tao. / Thesis (M.Phil.)--Chinese University of Hong Kong, 1989. / Bibliography: leaf [67].
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High power optical cavity design and concept of operations for a shipboard free electron laser weapon /Fontana, Timothy S. January 2003 (has links) (PDF)
Thesis (M.S. in Applied Physics)--Naval Postgraduate School, December 2003. / Thesis advisor(s): William B. Coulson, Robert L. Armstead. Includes bibliographical references (p. 71-72). Also available online.
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Simulations of a short Rayleigh length 100 kW FEL and mirror stability analysis /Campbell, Thomas E. January 2002 (has links) (PDF)
Thesis (M.S. in Physics)--Naval Postgraduate School, December 2002. / Thesis advisor(s): William B. Colson, Robert L. Armstead. Includes bibliographical references (p. 79-80). Also available online.
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Design and construction of an eight millimeter period undulator for use in a high average power far-infrared free electron laserTesch, Paul P. 01 January 1999 (has links)
No description available.
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Modeling spontaneous undulator emissions using Lienard-Wiechert fieldsHallman, Susan 01 April 2003 (has links)
No description available.
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