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Regenerative gain in a Raman free-electron laser oscillator

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4 Author(s)
J. Masud ; Columbia University, New York, NY ; T. Marshall ; S. Schlesinger ; F. Yee

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/cm2), relativistic (600-800 keV), cold [ (\delta \gamma /\gamma )_{\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 _{\perp }/\upsilon _{\parallel} ) velocity. The laser power output has been mea sured at ∼ 3 MW corresponding to an efficiency of 4 percent, and tunability in the 90-170 GHz range has been achieved with a narrow linewidth ( \Delta \lambda /\lambda \leq 1 percent). Using a new technique, linear small-signal growth rates have been unfolded from the oscillator startup delays. Excellent agreement is found 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.

Published in:

IEEE Journal of Quantum Electronics  (Volume:23 ,  Issue: 9 )