This paper discusses a fundamental difference between the symmetry properties of a laser with conventional optical feedback and that of a laser with phase-conjugate feedback. As a consequence, the possible dynamics and bifurcations for these two types of laser systems differ considerably, a fact that has not been noted in earlier comparisons between these two systems.
Additional information: Preprint of a paper later published by Elsevier Science (2000), Optics Communications, 177(1-6), pp.347-353, ISSN 0030-4018
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