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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Vol. 12, Iss. 9 — Sep. 1, 1995
  • pp: 1602–1616

Spatiotemporal effects in double phase conjugation

M. R. Belić, J. Leonardy, D. Timotijević, and F. Kaiser  »View Author Affiliations

JOSA B, Vol. 12, Issue 9, pp. 1602-1616 (1995)

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Spatial and temporal effects arising in photorefractive crystals during the process of double phase conjugation are analyzed numerically with a novel beam-propagation method. Slowly varying envelope wave equations in the paraxial approximation are solved under the appropriate boundary conditions. Our analysis includes dynamical effects caused by the buildup of diffraction gratings in the crystal and the turn-on of phase-conjugate beams as well as spatial effects caused by the finite transverse spread of beams and by the propagation directions of the beams. Various phenomena are observed, such as self-bending of phase-conjugate beams, convective flow of energy out of the interaction region, mode oscillations, critical slowing down at the oscillation threshold, and irregular spatial pattern formation. For a real beam-coupling constant and constructive interaction of interference fringes in the crystal we find steady or periodic behavior. For a complex coupling constant and/or induced phase mismatch in the grating a transition to spatiotemporal chaos is observed. We believe that under stable operating conditions the transverse double phase-conjugate mirror in the paraxial approximation is a convective oscillator, rather than an amplifier. Improved agreement with experimental results is obtained.

© 1995 Optical Society of America

M. R. Belić, J. Leonardy, D. Timotijević, and F. Kaiser, "Spatiotemporal effects in double phase conjugation," J. Opt. Soc. Am. B 12, 1602-1616 (1995)

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