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Applied Optics

Applied Optics


  • Vol. 37, Iss. 2 — Jan. 10, 1998
  • pp: 352–360

Spatial-Frequency Response of Photorefractive Phase Conjugators with Ce:BaTiO3

Changxi Yang, Katuo Seta, and Yong Zhu  »View Author Affiliations

Applied Optics, Vol. 37, Issue 2, pp. 352-360 (1998)

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We propose and demonstrate an interferometric method to measure thespatial-frequency response of photorefractive phase conjugators withCe:BaTiO3. Two coherent beams are incident on a crystaland form an interference pattern inside the crystal. The two beamsundergo stimulated photorefractive backscattering, which creates theircorresponding phase conjugations. Then the four waves interactwithin the crystal. The spatial-frequency resolution of the phaseconjugators is measured to be as high as 3750 line pairs/mm by use ofthe interferometric method. There are several factors that limitthe measured spatial resolution when using a U.S. Air Force ResolutionChart. The output modulation deviates from the input modulation forhigh spatial frequencies. In the presence of a strong additionalpump beam, the output modulation of the phase conjugators is almost thesame as the input modulation for a wide range of input spatialfrequencies. The phase conjugator exhibits a large dynamic range ofintensity. We analyze theoretically the modulation transferfunction of photorefractive phase conjugators withCe:BaTiO3 for two mutually coherent beams. Thetheoretical analysis is in agreement with the experimental resultswithin a small incident-angle region.

© 1998 Optical Society of America

OCIS Codes
(110.4100) Imaging systems : Modulation transfer function
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(190.5040) Nonlinear optics : Phase conjugation

Changxi Yang, Katuo Seta, and Yong Zhu, "Spatial-Frequency Response of Photorefractive Phase Conjugators with Ce:BaTiO3," Appl. Opt. 37, 352-360 (1998)

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