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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1995),
  • paper QWD14

New degenerate-four-wave-mixing geometry in Kerr waveguides

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Abstract

Degenerate four-wave mixing (DFWM) is one of the most appropriate methods for characterizing third-order nonlinearity. We propose a new DFWM geometry in planar-waveguide geometry that is simpler than the previously reported technique.1 Our geometry, shown in Fig. 1, consists of a probe beam incident from above the waveguide plane and two oppositely propagating guided pumps. Such DFWM signals are obtained in reflection and, what is particular to this geometry, also in transmission (see Fig. 1). Our theoretical model has shown that the reflectivity (DFWM energy divided by the probe energy) does not depend on the interaction length of the two pumps for waveguide modes far from cutoff. This result gives an evaluation of the nonlinearity by simply measuring the reflectivity and the guided pump energy decoupled out of the waveguide. We report here what we believe to be the first experimental observation of DFWM in waveguides with guided pumps and a free probe in a Kerr media.

© 1995 Optical Society of America

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