Abstract
Phase distortions such as thermal lensing in laser rods can be compensated by optical phase conjugation. The phase conjugating mirror (PCM) can be easily realized by selfpumped stimulated Brillouin scattering (SBS) in liquids and gases. Pulsed Nd:YAG master-oscillator-double-pass-amplifier-systems (MOPAs) with PCMs were frequently built and are commercially available, now. Oscillators with PCMs are much simpler in their construction but more difficult in their design. Nevertheless, Q-switched Nd-rod oscillators with PCM can be realized with diffraction limited beam quality. Even with a not optimized set-up using a phase conjugating SBS-cell as highly reflecting resonator mirror in a flash lamp pumped Nd:YALO rod laser we achieved tunable average output power between 3 and 20 Watts. Thermal lensing of the rod with focal lengths of less than 30 cm was compensated.
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