A master oscillator power amplifier system comprising a cw Nd:YAG master oscillator, a quasi-cw diode-pumped power amplifier, and a fiber-based stimulated Brillouin scattering phase-conjugate mirror is reported. A 12-pass amplifier configuration is employed to achieve high gain in a small-length slab amplifier. Residual and pump-induced optical inhomogeneities in the slab are corrected by the fiber phase conjugator to achieve diffraction-limited output beam quality. 300 W quasi-cw output and a maximal attainable gain of ∼150 for the system are obtained.
© 2005 Optical Society of America
(140.3280) Lasers and laser optics : Laser amplifiers
(190.4370) Nonlinear optics : Nonlinear optics, fibers
(190.5040) Nonlinear optics : Phase conjugation
(290.5900) Scattering : Scattering, stimulated Brillouin
Valeri I. Kovalev, Robert G. Harrison, and Andrew M. Scott, "300 W quasi-continuous-wave diffraction-limited output from a diode-pumped Nd:YAG master oscillator power amplifier with fiber phase-conjugate stimulated Brillouin scattering mirror," Opt. Lett. 30, 3386-3388 (2005)