Abstract
It is well known that the stimulated photon echo (SPE) generated by a train of three exciting pulses of identical frequency ωL are at resonance with some inhomogeneously broadened transition |1〉-|2〉 of the atoms of a medium. The first two pulses (the “writing" pulses) give rise to a frequency- modulated population difference (a frequency population "grating") and the diffraction of the third pulse (the "readout" pulse) by the frequency "grating" gives rise to a coherent response in the medium. One might ask how the response would change if the medium were excited by an additional pair of pulses before the application of the "readout" signal. If the relative phase difference of these additional pulses could be varied smoothly with respect to the phase difference of the "writing" pair. The main purpose of the present report was to answer this question.
© 1994 Optical Society of America
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