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A new pumping scheme was designed for a laser oscillator of a longitudinal electron beam pumped high power laser. In this system, an annular electron beam was converged and guided along the optical axis by a carefully shaped magnetic field which enabled a total reflector of the optical cavity to be placed on the optical axis. For KrF laser oscillation, the output energy and efficiency were 5 J and 4%, respectively.
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Kawamura et al. (1982) studied this question.
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