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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 20 — Jul. 10, 2001
  • pp: 3359–3364

Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams

Bao-Lai Liang, Zhaoqi Wang, C. M. Cartwright, W. A. Gillespie, Mei-Song Ding, and Hui Zhang  »View Author Affiliations


Applied Optics, Vol. 40, Issue 20, pp. 3359-3364 (2001)
http://dx.doi.org/10.1364/AO.40.003359


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Abstract

We have improved the two-wave coupling amplification and the signal-to-noise ratio of an amplified signal with photorefractive cerium-doped potassium sodium strontium barium niobate (Ce:KNSBN) by employing optimum polarization orientation of the pump beam while the signal beam retains extraordinary polarization. The optimum polarization angle of the pump beam was found experimentally to be 30° with respect to the extraordinary polarization direction in a symmetrically incident system. Nearly 1.9-times enhancement of the gain and nearly 3-times enhancement of the signal-to-noise ratio were achieved at a signal-to-pump beam intensity ratio of 1:40. At a beam intensity ratio of 1:2000, a two-wave coupling gain of nearly 500 was obtained, which is much higher than the gain previously reported. Modified coupled-wave equations that involve beam fanning with certain assumptions concerning the fanning parameters were used. The numerical solution is in good agreement with the experimental data. The results are compared with those obtained with a 45°-cut BaTiO3 crystal.

© 2001 Optical Society of America

OCIS Codes
(090.7330) Holography : Volume gratings
(160.5320) Materials : Photorefractive materials
(190.5330) Nonlinear optics : Photorefractive optics
(190.7070) Nonlinear optics : Two-wave mixing

History
Original Manuscript: December 1, 2000
Revised Manuscript: April 9, 2001
Published: July 10, 2001

Citation
Bao-Lai Liang, Zhaoqi Wang, C. M. Cartwright, W. A. Gillespie, Mei-Song Ding, and Hui Zhang, "Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams," Appl. Opt. 40, 3359-3364 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-20-3359

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