A phase conjugating mirror combining a fused silica rod and an optical fiber is presented. This configuration combines a large diameter fused silica rod with a high laser damage threshold and an optical fiber with a low stimulated Brillouin scattering (SBS) threshold. The composed SBS generator–amplifier construction, similar to the two-cell type makes a forced SBS process, in which the Stokes beam reflected by the fiber is injected into the fused silica rod. Using this combined phase conjugating mirror in a laser-diode-pumped laser master oscillator power amplifier system, we obtained 42% SBS reflectivity at most at $100\mathrm{Hz}$ repetition rate. At the same time, the inverse beam quality parameter $M^2$ is reduced from 3 to 1.6, while at $400\mathrm{Hz}$ repetition rate, $M^2$ is reduced from 4 to 1.7.

© 2007 Optical Society of America

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