Abstract
A study is reported of self-pumped phase conjugation by near-forward stimulated scattering of a beam from a quasi-cw YAG : Nd laser in a layer of a nematic liquid crystal without an absorbing dye but in the presence of a nonreciprocal feedback loop. The phase nonreciprocity of this loop is realised by a polarisation rotator and a phase plate. A significant reduction in the threshold of generation of a phase-conjugated wave is reported for the case of a π/2 phase shift between the optical pump and scattering waves travelling in opposite directions along the feedback loop.
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