Gain in spatially varying optical fields: Applications to high emittance beams and gas dielectric FEL's

Journal Article · Tue Sep 01 04:00:00 EDT 1987 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/JQE.1987.1073558· OSTI ID:5982935

Reid, M B; Feinstein, J; Pantell, R H; Fisher, A S

The conventional free-electron laser small-signal linear gain equation is revised to include the effects of nonuniform optical mode area, finite electron beam emittance, and electron beam energy spread. It is shown for a typical case that the conventional equation overestimates gain by more than 50 percent. The results further show that gain can result from FEL designs with interaction lengths longer than the conventional maximum given by the criterion of accumulated phase shift equal to ..pi... This makes possible a gas-loaded FEL which utilizes a long wiggler and an asymmetric mode to enhance the electron-optical field interaction. Although substantial emittance is induced by scattering, the gas-loaded FEL should have modest gain at wavelengths down to the ultraviolet.

• Research Organization: Dept. of Electrical Engineering, Stanford Univ., Stanford, CA 94305
• OSTI ID: 5982935
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. QE-23:9; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
ASYMMETRY
BEAMS
DIELECTRIC MATERIALS
DISTRIBUTION
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
ELECTRON BEAMS
ELECTRON EMISSION
EMISSION
EQUATIONS
EQUIPMENT
FLUIDS
FREE ELECTRON LASERS
GAIN
GASES
LASER RADIATION
LASERS
LEPTON BEAMS
MAGNETS
MATERIALS
PARTICLE BEAMS
PHASE SHIFT
RADIATIONS
SCATTERING
SPATIAL DISTRIBUTION
ULTRAVIOLET RADIATION
WAVELENGTHS
WIGGLER MAGNETS