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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 20 — Oct. 3, 2005
  • pp: 8198–8203

Transition between superluminal and subluminal light propagation in photorefractive Bi12SiO20 crystals

Fang Bo, Guoquan Zhang, and Jingjun Xu  »View Author Affiliations

Optics Express, Vol. 13, Issue 20, pp. 8198-8203 (2005)

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We demonstrated superluminal light propagation with a negative group velocity of –5.7 m/s in a photorefractive Bi12SiO20 crystal by using the dispersive phase coupling effect in a nondegenerate two-wave mixing process. To the best of our knowledge, this is the first experimental demonstration of superluminal light propagation at room temperature in solids by using a classical wave mixing technique. In addition, we showed the tunability of the group velocity of light between the negative (superluminal light) and the positive (subluminal light) by simply tuning the experimental conditions such as the frequency of the coupling beam, the incident intensity, and the externally applied electric fields.

© 2005 Optical Society of America

OCIS Codes
(050.5080) Diffraction and gratings : Phase shift
(190.5330) Nonlinear optics : Photorefractive optics
(190.7070) Nonlinear optics : Two-wave mixing
(270.1670) Quantum optics : Coherent optical effects

ToC Category:
Research Papers

Original Manuscript: August 16, 2005
Revised Manuscript: September 21, 2005
Published: October 3, 2005

Fang Bo, Guoquan Zhang, and Jingjun Xu, "Transition between superluminal and subluminal light propagation in photorefractive Bi12SiO20 crystals," Opt. Express 13, 8198-8203 (2005)

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