Regenerative gain in a Raman free-electron laser oscillator

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

DOI:https://doi.org/10.1109/JQE.1987.1073540· OSTI ID:6131329

Masud, J; Marshall, T C; Schlesi,; Yee, F G

A parametric study of gain in a millimeter-wave Raman free-electron laser oscillator and comparisons to linear theory are carried out. The intense (1 kA/cm/sup 2/), relativistic (600-800 keV) is cold ((delta..gamma../..gamma..)/sub parallel/ < 1 percent) electron beam employed is guided by a 9.45 kG magnetic field through a 1.45 cm period, 49.5 cm long uniform undulator. Operation at <1 kG pump field results in a <10 percent electron quiver velocity (upsilon/sub perpendicular//upsilon/sub parallel/) velocity. The laser power output has been measured at -- 3 MW corresponding to an efficiency of 4 percent, and tunability in the 90-170 GHz range has been achieved with a narrow line-width (..delta..lambda/lambdaless than or equal to1 percent). Using a new technique, linear small-signal growth rates have been unfolded with three-dimensional small-signal calculations for both the spatial growth rate and the resonance frequency. One-dimensional theory was found to predict shorter wavelength laser output than that observed.

• Research Organization: Plasma Physics Lab., Columbia Univ., New York, NY 10027
• OSTI ID: 6131329
• 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
BEAMS
EFFICIENCY
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
ELECTRON BEAMS
ELECTRONIC EQUIPMENT
ENERGY RANGE
EQUIPMENT
FREE ELECTRON LASERS
GAIN
KEV RANGE
KEV RANGE 100-1000
LASER RADIATION
LASERS
LEPTON BEAMS
LINE WIDTHS
MAGNETIC FIELDS
MAGNETS
OSCILLATORS
PARTICLE BEAMS
POWER RANGE 1-10 MW
RADIATIONS
RAMAN EFFECT
REGENERATION
RELATIVISTIC RANGE
RESONANCE
SIGNALS
TUNING
VELOCITY
WIGGLER MAGNETS