Self-conjugation of a speckle pump beam in a loop containing a photorefractive crystal

Мамаев, А. В.; Shkunov, V. V.

doi:10.1070/qe1992v022n11abeh003663

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Note that in solving these equations we assume that Io is much larger than Idark; hence 1 + IO/Idark IO/Idark in Eq. (8). We use 21 plane waves separated by 0.50 covering a total angular spectrum of 100.…”

Section: Basic Properties Of the Dpcmmentioning

confidence: 99%

“…The evolution of these coefficients is governed by the following set of nonlinear differential equations: (8) 2 ) in the transverse direction (x) is equal to Io, which is a constant in the absence of absorption. The coupling constants between the individual plane waves are Ymn, which depend on the particular crystal parameters, the angles of propagation, and the polarization of the beams.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Another theoretical analysis describing the self-pumped phase conjugation of a speckled beam in a PR medium was presented by Lyubomudrov and Shkunov 7 and was experimentally verified by Mamaev and Shkunov. 8 Recently we developed a model to calculate the temporal and the spatial behavior of fanning 9 and of the DPCM 6 and predicted a gain threshold for the conjugation fidelity. The gain threshold was also observed experimentally.'…”

Section: Introductionmentioning

confidence: 99%

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Double phase conjugation

et al. 1994

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We model the double phase-conjugate mirror (DPCM) as a function of time, the average direction of propagation of the two beams forming the DPCM, and one transverse coordinate. Calculations show that the conjugation fidelity and reflectivity have different dependencies on the photorefractive coupling coefficient times length; the fidelity turns on abruptly with a threshold, whereas the reflectivity increases smoothly. The DPCM behaves as an oscillator at and above threshold: the time required for the reflectivity to reach the steady state dramatically slows down near threshold (like critical slowing down in lasers); above threshold the DPCM is self-sustaining even if the random noise terms used to start the process are set to zero. A decrease in the noise level improves the fidelity but increases the response time. The use of unbalanced input beam ratios results in asymmetric conjugation such that the fidelity obtained on the side of the weaker input beam is significantly reduced. The slowing down diminishes with increasing noise level or unbalanced input intensities.

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Section: Basic Properties Of the Dpcmmentioning

confidence: 99%

Section: Theoretical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Double phase conjugation

et al. 1994

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Photorefractive circuitry and optical transistors

Belić

Petrović

Kaiser³

1996

Optics Communications

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Double phase conjugation in copper-doped potassium sodium strontium barium niobate crystals

Zhang

Chen

et al. 1997

Appl. Opt.

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We show a double phase conjugator with novel crystals of copper-doped potassium sodium strontium barium niobate. The phase conjugation reflectivity can reach 278% and depends on relative input positions of both incident beams. The response time with the input beam power ratio is measured and modeled as a function of input beam power ratio. The formation of the arch coupling loop is analyzed with theoretical simulation results and a positive feedback process is proposed. The influence of a self-pumped phase conjugation process on double phase conjugation fidelity is also discussed. It is necessary to avoid generating self-pumped phase conjugation to prevent the reduction of double phase conjugation fidelity.

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Self-conjugation of a speckle pump beam in a loop containing a photorefractive crystal

Abstract: It is shown that a cancellation causes the contribution from certain exchange currents to the pion-deuteron scattering length to be much smaller than previously estimated.

Cited by 4 publications

References 7 publications

Double phase conjugation

Double phase conjugation

Photorefractive circuitry and optical transistors

Double phase conjugation in copper-doped potassium sodium strontium barium niobate crystals

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