Spontaneous emission and gain in a waveguide free-electron laser
- California Univ., San Diego, La Jolla, CA (United States). Dept. of Physics
A free-electron laser enclosed in a waveguide of narrowly spaced parallel plates has been proposed as a compact, coherent source of far-infrared radiation. In this paper, the spontaneous emission and small-signal gain of such a device are analyzed. Maxwell's equations are solved for the fields of a relativistic electron beam passing through a linearly polarized undulator in the presence of a parallel-plane waveguide. The radiation intensity is resolved into its component waveguide modes for the fundamental frequency and for all harmonics. The intensity profile in a given harmonic mode is altered significantly when a parameter involving the undulator period, beam energy, and transverse dimension of the guide is such that the radiation group velocity is close to the electrons' axial velocity. The small-signal gain in the waveguide free-electron laser is calculated and related to the spontaneous emission. Near zero slip, the gain curve is significantly different from that of a free-space free-electron laser with the same parameters.
- OSTI ID:
- 5615530
- Journal Information:
- IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States), Vol. 27:12; ISSN 0018-9197
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
FAR INFRARED RADIATION
LIGHT SOURCES
FREE ELECTRON LASERS
GAIN
MODE CONTROL
RELATIVISTIC BEAM INJECTION
QUANTUM ELECTRONICS
CALCULATION METHODS
COHERENT RADIATION
ELECTRON BEAMS
EMISSION SPECTRA
HARMONICS
MAXWELL EQUATIONS
WAVEGUIDES
AMPLIFICATION
BEAM INJECTION
BEAMS
CONTROL
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
EQUATIONS
INFRARED RADIATION
LASERS
LEPTON BEAMS
OSCILLATIONS
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE BEAMS
RADIATION SOURCES
RADIATIONS
SPECTRA
426002* - Engineering- Lasers & Masers- (1990-)
661100 - Classical & Quantum Mechanics- (1992-)
400500 - Photochemistry