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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 31, Iss. 5 — May. 1, 2014
  • pp: 980–986

Manipulation of fast light using photorefractive beam fanning

Alexander Grabar, Pierre Mathey, and Grégory Gadret  »View Author Affiliations


JOSA B, Vol. 31, Issue 5, pp. 980-986 (2014)
http://dx.doi.org/10.1364/JOSAB.31.000980


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Abstract

Light pulse group velocity manipulations due to the specific dispersion of a medium (so-called “slow” and “fast” light phenomena) can be obtained on the basis of several mechanisms. One of these techniques is two-wave mixing in a photorefractive crystal. This work presents a modification of this method, exploiting the strong beam fanning in Sb-doped Sn2P2S6 crystals. Our experimental results demonstrate a “fast light” behavior of Gaussian pulses transmitted through a Sn2P2S6:Sb sample. The phenomenon is due to the beam fanning (i.e., the self-diffraction of the incident beam on self-induced noisy photorefractive gratings) that ensures a significant depletion of the input beam. Due to the relatively fast photorefractive response of the Sn2P2S6:Sb crystals this depletion occurs with times in the range of 10–100 ms, depending on the beam intensity, and the “fast light” feature is observed. The temporal and amplitude characteristics of the output beam are measured in function of the intensity and polarization azimuth of the incident beam. Besides, a negative phase shift of the periodical output beam relative to a sinusoidal intensity-modulated input beam is also obtained experimentally. It is shown that the phase and amplitude relation between the input and output periodic signals are described by a simple analytical expression that takes into account the beam fanning strength (depletion factor) and its dynamics (depletion time constant). It is also demonstrated that the pulse advance (or phase shift of the modulated signal) can be regulated by the light polarization azimuth. The advantages of the proposed method are discussed.

© 2014 Optical Society of America

OCIS Codes
(160.2260) Materials : Ferroelectrics
(160.5320) Materials : Photorefractive materials
(190.0190) Nonlinear optics : Nonlinear optics
(260.2160) Physical optics : Energy transfer
(190.2055) Nonlinear optics : Dynamic gratings
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Materials

History
Original Manuscript: November 25, 2013
Revised Manuscript: March 4, 2014
Manuscript Accepted: March 6, 2014
Published: April 8, 2014

Citation
Alexander Grabar, Pierre Mathey, and Grégory Gadret, "Manipulation of fast light using photorefractive beam fanning," J. Opt. Soc. Am. B 31, 980-986 (2014)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-31-5-980

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