Topic
Phase conjugation
About: Phase conjugation is a research topic. Over the lifetime, 3694 publications have been published within this topic receiving 49099 citations.
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TL;DR: In this article, beam recombination characteristics were numerically investigated in array laser amplification using stimulated Brillouin scattering phase conjugation, and the effect of piston errors due to imperfect phase locking was clarified.
Abstract: Beam recombination characteristics were numerically investigated in array laser amplification using stimulated Brillouin scattering phase conjugation. To clarify the effect of piston errors due to imperfect phase locking, spatial intensity profiles of the beam recombination output were calculated in both the near and the far field on the basis of Rayleigh-Sommerfeld diffraction theory. The analyses indicate that piston errors are seriously detrimental to the quality of a beam recombination output and should be eliminated by a proper phase locking. It is also found that the gap between the beam splitting-combining wedges has a negligible effect.
35 citations
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TL;DR: In this article, a retroreflecting screen is inserted into the path of the beam after the beam leaves a BaTiO3 crystal to reduce the threshold for self-pumped optical phase conjugation by backward stimulated photorefractive scattering.
Abstract: The threshold for self-pumped optical phase conjugation by means of backward stimulated photorefractive scattering has been dramatically lowered by inserting a retroreflecting screen into the path of the beam after the beam leaves a BaTiO3 crystal. Stable reflectivities of as much as −60% and good phase-conjugate fidelity have been demonstrated in a crystal that has too low a gain–length product to exhibit unseeded backward stimulated scattering. Precise control of the threshold for stimulated scattering is demonstrated by adjusting the seed intensity. Reflectivity and fidelity are experimentally characterized at 515 nm as a function of the following parameters: pump and seed intensities, crystal angle with respect to the incident beam direction, crystal interaction length, crystal–lens separation, and aberration strength. Operation at 633, 730–800, and 839 nm is demonstrated also.
35 citations
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TL;DR: In this article, the temporal behavior of optical phase conjugation by single-grating anisotropic four-wave mixing in photorefractive crystals is studied and numerical evidence for optical instabilities of the phase-conjugate wave amplitude is shown.
Abstract: The temporal behavior of optical phase conjugation by single-grating anisotropic four-wave mixing in photorefractive crystals is studied. Numerical evidence for optical instabilities of the phase-conjugate wave amplitude is shown.
35 citations
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TL;DR: In this article, the authors demonstrate polarization-independent parametric amplification of a 2.048-Tbit/s 8-WDM PDM 16-QAM signal and simultaneous wavelength conversion and phase conjugation in highly nonlinear fiber.
Abstract: We demonstrate polarization-independent parametric amplification of a 2.048-Tbit/s 8-WDM PDM 16-QAM signal and simultaneous wavelength conversion and phase conjugation in a highly nonlinear fiber. Two high-power continuous-wave pumps with orthogonal polarizations and counter-phase modulation are used in the fiber optical parametric amplifier (FOPA) to achieve broadband flat gain, polarization independence, and high-quality idler generation. The polarization-independent FOPA is amplitude and phase preserving and has ∼10 dB on-off gain for the signal and ∼9 dB conversion efficiency for the idler with a 1-dB bandwidth of ∼16 nm. Compared to the back-to-back case, the amplified signals and the wavelength-converted conjugates have mean Q2 penalties of only 0.6 and 0.4 dB, respectively, with variances of Q2 factors across all the wavelength-division-multiplexed channels of only 0.3 dB. This demonstration shows the great promise of optical signal processing techniques to simultaneously process large-capacity multiple-channel multilevel signals with almost no latency and potentially low power consumption.
35 citations
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TL;DR: In this article, it is shown that it is possible to control with good accuracy the relative phase of several conjugate beams for a properly designed Brillouin-enhanced four-wave-mixing phase conjugation system.
Abstract: We show that it is possible to control with good accuracy the relative phase of several conjugate beams for a properly designed Brillouin-enhanced four-wave-mixing phase conjugation system. Three geometries, two that utilize two Brillouin cells and another that requires only one Brillouin cell, that achieve conjugate phase control are studied and many properties of each system are examined. We show that for our high-power laser application the one-cell geometry performs as well as or better than the other geometry. Phase control is shown to be useful for beam combination, vector phase conjugation, and optical path selection. A laser system that utilizes the one-cell geometry to enhance its performance is built and examined.
35 citations