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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 paper, the potential of nonlinear atomic optics to achieve phase conjugation of atomic de Broglie waves was discussed, and the analogies and differences between the cases of conventional optics and of atomic optics were illustrated.
Abstract: We discuss the potential of nonlinear atomic optics to achieve phase conjugation of atomic de Broglie waves. We discuss specifically two examples which help illustrate the analogies and differences between the cases of conventional optics and of atomic optics. In the first case, the upper electronic level of the atoms is adiabatically eliminated, leading to a scalar theory formally identical to conventional four-wave mixing. In the second case, both electronic levels are kept, leading to a vector field for which the 'coupled-mode equations' of phase conjugation involve the coupling between the wavefunctions of the two electronic levels.
14 citations
TL;DR: In this paper, the authors showed that phase conjugation can be enhanced by more than four orders of magnitude in a nonlinear superlattice, as compared with that in a homogeneous nonlinear medium of the same sample thickness and nonlinearity.
Abstract: We predict that the efficiency of the optical phase conjugation generation can be enhanced by more than four orders of magnitude in a ${\ensuremath{\chi}}^{(3)}$ nonlinear superlattice, as compared with that in a homogeneous nonlinear medium of the same sample thickness and ${\ensuremath{\chi}}^{(3)}$ nonlinearity. Such an effective enhancement utilizes the localized properties of the fields inside the sample at the band-edge state, gap-soliton state, or defect state. Due to the presence of feedback mechanism at each interface of a superlattice, we also predict that the phase conjugation can still be effectively generated when only one pump wave is used.
14 citations
TL;DR: In this paper , the authors demonstrate interesting phenomena arising at temporal interfaces when they involve finite-size resonant structures and show the possibility of achieving efficient phase conjugation of the stored electromagnetic energy with a pair of suitably tailored switching events.
Abstract: Temporal interfaces, arising when the electromagnetic properties of a medium are abruptly switched in time, have been recently raising interest as the dual of spatial interfaces. Their study has been mostly focused on switching in time the properties of infinite media, for which the wave momentum is conserved, yielding the dual phenomenon of spatial interfaces at which the frequency is conserved. Here, we demonstrate interesting phenomena arising at temporal interfaces when they involve finite-size resonant structures. By abruptly changing the permittivity of a grounded dielectric slab supporting a strong leaky-wave resonance, we show the possibility of achieving efficient phase conjugation of the stored electromagnetic energy with a pair of suitably tailored switching events. Our work opens interesting opportunities for space-time metamaterials in the context of imaging, holography, and efficient frequency conversion.
14 citations
TL;DR: In this paper, the transient response of Kerr-like phase conjugators is treated and reviewed for specific cases such as pulse reshaping, chirp reversal, and temporal reversal of optical waveforms.
Abstract: The transient response of Kerr-like phase conjugators is treated and reviewed. The cases of cw and transient pump waves are considered. A general formalism is derived, with application to specific cases such as pulse reshaping, chirp reversal, and temporal reversal of optical waveforms.
14 citations
TL;DR: In this article, a novel technique for narrowing the linewidth of a single laser diode using photorefractive phase conjugate feedback is presented, and the behavior of this system can be modeled by adapting the previously developed theory to include the phase constraints of the phase-constrained external cavity.
Abstract: A novel technique for narrowing the linewidth of a single laser diode using photorefractive phase conjugate feedback is presented. The behavior of this system can be modeled by adapting the previously developed theory to include the phase constraints of the phase conjugate external cavity. The experiments show excellent agreement with the model. This technique produces a stable, narrow linewidth in a semiconductor laser. The comparison to the conventional case is discussed.
14 citations