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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/758

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Title: Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams
Authors: Liang, Bao-Lai
Wang, Zhaoqi
Cartwright, Colin M.
Gillespie, W. A.
Ding, Mei-Song
Affiliation: University of Abertay Dundee. School of Computing & Engineering Systems
Keywords: Optics
Issue Date: 2001
Publisher: Optical Society of America
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Optical Society of America, available from doi:10.1364/AO.40.003359
Citation: Liang, B-L.,et al. 2001. Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams. Applied Optics. 40(20): pp.3359-3364. Available from http://dx.doi.org/10.1364/AO.40.003359
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.
URI: http://hdl.handle.net/10373/758
ISSN: 0003-6935
Appears in Collections:Computing & Engineering Systems Collection

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