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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 25 — Dec. 8, 2008
  • pp: 20448–20456

Fast-light in a photorefractive crystal for gravitational wave detection

H. N. Yum, M. Salit, G. S. Pati, S. Tseng, P. R. Hemmer, and M. S. Shahriar  »View Author Affiliations

Optics Express, Vol. 16, Issue 25, pp. 20448-20456 (2008)

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We demonstrate superluminal light propagation using two frequency multiplexed pump beams to produce a gain doublet in a photorefractive crystal of Ce:BaTiO3. The two gain lines are obtained by two-wave mixing between a probe field and two individual pump fields. The angular frequencies of the pumps are symmetrically tuned from the frequency of the probe. The frequency difference between the pumps corresponds to the separation of the two gain lines; as it increases, the crystal gradually converts from normal dispersion without detuning to an anomalously dispersive medium. The time advance is measured as 0.28 sec for a pulse propagating through a medium with a 2Hz gain separation, compared to the same pulse propagating through empty space. We also demonstrate directly anomalous dispersion profile using a modified experimental configuration. Finally, we discuss how anomalous dispersion produced this way in a faster photorefractive crystal (such as SPS: Sn2P2S6) could be employed to enhance the sensitivity-bandwidth product of a LIGO type gravitational wave detector augmented by a White Light Cavity.

© 2008 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(090.1970) Holography : Diffractive optics
(160.5320) Materials : Photorefractive materials
(190.5330) Nonlinear optics : Photorefractive optics
(190.7070) Nonlinear optics : Two-wave mixing
(350.2770) Other areas of optics : Gratings

ToC Category:
Slow and Fast Light

Original Manuscript: September 23, 2008
Revised Manuscript: November 19, 2008
Manuscript Accepted: November 20, 2008
Published: November 25, 2008

H. N. Yum, M. Salit, G. S. Pati, S. Tseng, P. R. Hemmer, and M. S. Shahriar, "Fast-light in a photorefractive crystal for gravitational wave detection," Opt. Express 16, 20448-20456 (2008)

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  1. M. S. Shahriar, G. S. Pati, R. Tripathi, V. Gopal, M. Messall and K. Salit, "Ultrahigh Precision Absolute and Relative Rotation Sensing using Fast and Slow Light," Phys. Rev. A 75, 053807 (2007). [CrossRef]
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