Abstract
During the past year the Boeing free electron laser optical cavity was changed from a simple concentric cavity using two spherical mirrors to a much larger ring resonator. The new resonator is made up of two-mirror telescopes located at each end of the wiggler with a round-trip path length of approximately 133 m. Each telescope consists of a grazing-incidence hyperboloid and a paraboloid. First lasing operation at 0.63 μm occurred on March 23 and 24, 1990. The lasing output was approximately seven orders of magnitude above the outcoupled spontaneous emission. The characteristics of the ring resonator are discussed. Lasing data is analyzed for the electron beam and ring resonator effects. Optical alignment techniques for the ring resonator are presented.
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