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

Bao-Lai Liang, Zhao-Qi Wang, Colin M. Cartwright, W. Allan Gillespie, Mei-Song Ding, Hui Zhang

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)3359-3364
Number of pages6
JournalApplied Optics
Volume40
Issue number20
DOIs
StatePublished - 2001

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polarization
pumps
augmentation
signal to noise ratios
crystals
niobates
cerium
strontium
wave equations
barium
potassium
sodium

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Liang, B-L., Wang, Z-Q., Cartwright, C. M., Gillespie, W. A., Ding, M-S., & Zhang, H. (2001). Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams. Applied Optics, 40(20), 3359-3364. DOI: 10.1364/AO.40.003359

Liang, Bao-Lai; Wang, Zhao-Qi; Cartwright, Colin M.; Gillespie, W. Allan; Ding, Mei-Song; Zhang, Hui / Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams.

In: Applied Optics, Vol. 40, No. 20, 2001, p. 3359-3364.

Research output: Contribution to journalArticle

@article{eb130d82051c47d182502b4723f8f44b,
title = "Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams",
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.",
author = "Bao-Lai Liang and Zhao-Qi Wang and Cartwright, {Colin M.} and Gillespie, {W. Allan} and Mei-Song Ding and Hui Zhang",
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volume = "40",
pages = "3359--3364",
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Liang, B-L, Wang, Z-Q, Cartwright, CM, Gillespie, WA, Ding, M-S & Zhang, H 2001, 'Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams' Applied Optics, vol 40, no. 20, pp. 3359-3364. DOI: 10.1364/AO.40.003359

Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams. / Liang, Bao-Lai; Wang, Zhao-Qi; Cartwright, Colin M.; Gillespie, W. Allan; Ding, Mei-Song; Zhang, Hui.

In: Applied Optics, Vol. 40, No. 20, 2001, p. 3359-3364.

Research output: Contribution to journalArticle

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T1 - Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams

AU - Liang,Bao-Lai

AU - Wang,Zhao-Qi

AU - Cartwright,Colin M.

AU - Gillespie,W. Allan

AU - Ding,Mei-Song

AU - Zhang,Hui

PY - 2001

Y1 - 2001

N2 - 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.

AB - 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.

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Liang B-L, Wang Z-Q, Cartwright CM, Gillespie WA, Ding M-S, Zhang H. Enhancement of two-wave coupling in a Ce:KNSBN crystal with optimum polarization of the writing beams. Applied Optics. 2001;40(20):3359-3364. Available from, DOI: 10.1364/AO.40.003359