1 April 1982 Optical Beam Phase Conjugation By Four-Wave Mixing In A Waveguide
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Theory and experiments are reviewed which suggest that optical-beam phase conjugation by four-wave mixing in a waveguide has the following advantages over four-wave mixing of unguided waves: (1 ) pump power requirements are reduced; (2) the pump beams can contain many transverse modes, both outside and inside the waveguide; (3) pump beam alignment is not critical; (4) the image-wave, being conjugated, can serve simultaneously as its own pump beam; (5) many frequencies can be conjugated simultaneously without intermixing of signals; and (6) frequency- and angle-response characteristics of the conjugator as an optical filter are extended. Frequency depen-dent resonances in the phase-conjugate signal may be employed in spectroscopy of small samples.
R. w. Hellwarth, R. w. Hellwarth, } "Optical Beam Phase Conjugation By Four-Wave Mixing In A Waveguide," Optical Engineering 21(2), 212263 (1 April 1982). https://doi.org/10.1117/12.7972892 . Submission:

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