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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, the phase conjugated energy and inductive loading of the constituent lens wire elements is shown to be essential for sub-wavelength focusing since this leads to the creation of a phase-conjugated near field predominantly determined by a convolution of the array current distribution with the real part of the Greens function which oscillates at a subwavelength scale.
Abstract: The properties of a lumped loaded wire array as a means for near field focusing using phase conjugation is studied. The constructive role of phase conjugation in the near field image formation is justified both analytically and numerically. The generation of phase conjugated energy and how this is influenced by lumped impedance loading of the wires constituting the lens is discussed. In particular it is shown that inductive loading of the constituent lens wire elements is essential for subwavelength focusing since this leads to the creation of a phase conjugated near field predominantly determined by a convolution of the array current distribution with the real part of the Greens function which oscillates at a subwavelength scale. The characteristic resolution of the lens in terms of the full width at half maximum is shown to be ~ λ/7 for a single source and better than λ/4 for two dipole sources at λ/10 source-lens separation distance.
18 citations
TL;DR: Using phase conjugation by stimulated Rayleigh-wing scattering in carbon disulfide, phase-conjugate reflectivities are observed and simultaneous correction of wave-front and polarization distortions is observed.
Abstract: Using phase conjugation by stimulated Rayleigh-wing scattering (SRWS) in carbon disulfide, we have observed simultaneous correction of wave-front and polarization distortions. SRWS was excited by pulses of 20-psec duration containing as much as 15 μJ of energy at a wavelength of 0.53 μm and produced phase-conjugate reflectivities as large as 10%.
18 citations
TL;DR: Qualitatively different polarization behavior is observed for pump intensities near or above the two-photon saturation intensity, as predicted by third-order theories.
Abstract: We have studied the polarization properties of phase conjugation by degenerate four-wave mixing resonantly enhanced by the sodium 3S1/2 → 6S1/2 two-photon-allowed transition. As predicted by third-order theories, this interaction leads to simultaneous conjugation of the optical wave front and state of polarization (vector phase conjugation) when the pump intensities are sufficiently weak. However, qualitatively different polarization behavior is observed for pump intensities near or above the two-photon saturation intensity.
18 citations
TL;DR: Self-pumped optical phase conjugation has been demonstrated for the first time to the authors' knowledge in a resonant atomic system by using a single cw pump beam to excite a sodium-vapor oscillator.
Abstract: Self-pumped optical phase conjugation has been demonstrated for the first time to our knowledge in a resonant atomic system. This process was implemented by using a single cw pump beam to excite a sodium-vapor oscillator. The counterpropagating optical fields inside this oscillator then combine with the pump beam in an internal four-wave-mixing interaction to yield the phase conjugate of the incident (pump) beam.
18 citations
TL;DR: In this paper, the wave front reversal for non-reciprocal magnetostatic surface waves propagating in ferromagnetic yttrium iron garnet films was studied theoretically and experimentally.
Abstract: The process of wave front reversal for nonreciprocal magnetostatic surface waves (MSSWs), propagating in ferromagnetic yttrium iron garnet films, has been studied theoretically and experimentally. The efficiency of wave front reversal for nonreciprocal MSSWs turned out to be approximately ten times smaller than for reciprocal backward volume magnetostatic waves under similar conditions.
18 citations