Abstract
A regenerative amplifier consisting of a conventional mirror as the output coupler and a phase-conjugating SBS cell as the high-reflectivity mirror was seeded with a single longitudinal and transverse mode oscillator with pulse durations of 10 ns and pulse energies up to 5.3 mJ. The output energy, temporal characteristics and beam-quality were measured as a function of pump energy, input energy and the reflectivity of the feedback mirror. Output energies up to 180 mJ were obtained for oscillator input energies of only 0.3 mJ. The beam quality was 2.5 times the diffraction limit. The results are compared with those for simple double-pass amplification.
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