High-phase-conjugate reflectivity (>70,000%) obtained in a quasi-continuous-wave diode pumped Nd:YVO/sub 4/ amplifier

We demonstrate the 700-times phase conjugation obtained by DFWM in the QCW-diode pumped slab Nd:YVO/sub 4/ amplifier. The reflectivity is the highest value, to the best of our knowledge, of that obtained previously by DFWM in a Nd:YVO/sub 4/ amplifier. The highly efficient PCM can be applied to a high power self-adaptive pulse laser system.