Abstract
Degenerate four-wave mixing (DFWM) in atomic vapors has been used widely for optical beam phase-conjugation and spectroscopy. Continuous-wave DFWM experiments use cycling transitions that keep the total ground- and excited-state populations interacting with the DFWM beams constant. Utilization of other transitions that are subject to optical pumping greatly reduces the interacting atomic population and the resulting phase conjugate signal.1 The present experiment shows that utilizing a second laser can counter the effects that optical pumping has on the transitions that are not cycling.
© 1992 Optical Society of America
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