Abstract
In recent years, phase conjugation by degenerate four-wave-mixing (DFWM) in saturable amplifiers has been received considerable attention because of its high reflectivity.1−3 However, an efficient phase conjugate mirror based on saturable gain requires high-small-signal-gain, which makes the continuous-wave (CW) operation more difficult to achieve. Mailis et.al. have demonstrated a phase conjugate reflectivity of 800% by DFWM in a CW-Nd:YVO4 amplifier.4 In this report, we present a phase conjugate reflectivity of 150-times obtained by DFWM from a CW diode-pumped Nd:YVO4 slab amplifier. To the best of our knowledge, the reflectivity value is the highest ever obtained previously by FWM in a CW saturable amplifier.
© 2002 Optical Society of America
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