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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 8, Iss. 6 — Jun. 1, 1991
  • pp: 1326–1332

Absorption gratings in photorefractive crystals with multiple levels

R. S. Cudney, R. M. Pierce, G. D. Bacher, and Jack Feinberg  »View Author Affiliations


JOSA B, Vol. 8, Issue 6, pp. 1326-1332 (1991)
http://dx.doi.org/10.1364/JOSAB.8.001326


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Abstract

Two coherent light beams can couple in any absorbing material owing to a light-induced modulation of the material’s dielectric constant. In photorefractive crystals the coupling caused by these absorption gratings appears in addition to any electro-optic coupling, complicating the interpretation of data. However, in contrast with the electro-optic gratings formed by charge diffusion, absorption gratings do not necessarily vanish as the beam-crossing angle approaches zero if there is more than one absorbing level. We show that a plot of the coupling strength of the absorption gratings versus the beam-crossing angle is characterized by only three parameters, independent of the number of absorbing levels. We use absorption gratings with a two-level model to determine experimentally some important crystal parameters, including the relative density of donors and acceptors in a barium titanate crystal. Our values agree with those obtained from measurements of the bulk light-induced absorption of the crystal.

© 1991 Optical Society of America

History
Original Manuscript: July 31, 1990
Manuscript Accepted: January 23, 1991
Published: June 1, 1991

Citation
R. S. Cudney, R. M. Pierce, G. D. Bacher, and Jack Feinberg, "Absorption gratings in photorefractive crystals with multiple levels," J. Opt. Soc. Am. B 8, 1326-1332 (1991)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-8-6-1326

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