Abstract
The free-electron cyclotron resonance laser, based on conversion of synchrotron radiation to a coherent oscillation, operates at an extremely high harmonic with a frequency of about 0.39/gamma//sub perpendicular//sup 3//omega//sub c/, with /gamma//sub perpendicular/ the transverse relativistic factor and /omega//sub c/ the relativistic cyclotron angular frequency. By introduction of the field amplitude spontaneous modified coefficient and by local expansion of the interaction light field, the linear efficiency and the startup current are derived. It is shown that this device possesses a strikingly narrow width of the efficiency profile and so can successfully oscillate on a single longitudinal mode to produce light output of good coherence.
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