Standing-Wave—Induced Backward Photon Echoes in Gases

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Abstract
It has been found that a standing-wave pulse may be employed to produce an easily detectable, backward-propagating, phase-conjugate "replica" of any traditional gas-phase photon-echo signal. Standing-wave—induced backward two-pulse photon echoes have been observed in lithium vapor while only apertures were used to block laser background. An interesting dependence of backward echo intensity on standing-wave orientation is observed and discussed.