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The Los Alamos free-electron laser (FEL) oscillator has been successfully operated over the wavelength range from 9 to 11μm with a peak output power of 1 MW and an average output power of 1 kW over the 70-μsec pulse length. This FEL is driven by a conventional rf linear accelerator operating at 1.3 GHz with a nominal energy of 20 MeV. Sufficient rf power is supplied to the accelerator to produce a burst of 2000 uniform current pulses, each ~30 psec in width and spaced by 46 nsec, the round-trip time of light in the 6.9-m optical cavity. Each pulse had a peak current of ~25 A, an energy spread of 1-2%, and an emittance of l-2π mm-mrad. For the present experiments, we used a 1-m-long undulator composed of SmCo5 permanent magnets in a uniform-period, plane-polarized configuration.
© 1984 Optical Society of America
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