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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1991),
  • paper CMC8

Nondegenerate photorefractive four-wave mixing without feedback in Bi12TiO20

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One of the most popular schemes is that of four- wave mixing (FWM) used for phase conjugation of a signal wave E3, in the field of two counterpropagating pump waves E1 and E2. However, negative feedback occurs in some cases, if the grating recorded by waves E2 and E4 is counterphased to the grating recorded by waves E1 and E3. Such feedback diminishes the phase- conjugate reflectivity (R) in that scheme. The negative feedback may be transformed into the positive one in a cubic photorefractive crystal of the sillenite family due to the polarization pecularities.1 Somewhat analogous improvement of the reflectivity has been demonstrated in BaTiO3.2

© 1991 Optical Society of America

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