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: The observation of optical phase conjugation utilizing the intrinsic Kerr-like nonlinear susceptibilities of two soluble polydiacetylenes was reported in this article, where the reflectivities of up to 40% were observed on a timescale of ≲100 ps and a value of χ(3)xyyx =7×10−12 esu evaluated.
Abstract: The observation of optical phase conjugation utilizing the intrinsic Kerr‐like nonlinear susceptibilities of two soluble polydiacetylenes is reported. Phase conjugate reflectivities of up to 40% were observed on a timescale of ≲100 ps and a value of χ(3)xyyx =7×10−12 esu evaluated.
82 citations
TL;DR: In this article, phase conjugation by nonlinear mixing using local gain saturation of a Nd':'YAG laser has been demonstrated, and the maximum conversion efficiency measured was 0.1%.
Abstract: Phase conjugation by nonlinear mixing using local gain saturation of a Nd : YAG laser has been demonstrated. Since the laser itself is used as a nonlinear conjugator, no additional nonlinear medium is needed. In principle, any laser can be used for this purpose since laser gain saturation is inherent to all lasers. The maximum conversion efficiency measured was 0.1%.
81 citations
TL;DR: A model and an experimental study of the saturation are described and four-wave mixing experiments are used for obtaining phase conjugation and information on the holographic resolution of the material.
Abstract: Bacteriorhodopsin exhibits strong nonlinear and saturation behavior with very low light intensities (~10 mW/cm(2)). A model and an experimental study of the saturation are described. Four-wave mixing experiments are used for obtaining phase conjugation and information on the holographic resolution of the material. Two kinds of samples were prepared and used in the experiments: films of bacteriorhodopsin in a solid polyvinylalcohol (polymer) matrix and in water.
80 citations
Proceedings Article•
09 Jun 1986TL;DR: In this paper, it was shown that if the size of the particles is much smaller than the optical wavelength and penetration depth and their fractional volume concentration p ≪ 1, the optical properties of these materials are well accounted for by the MaxwellGarnett theory.
Abstract: Composite materials formed by dispersing small size metal or semiconductor particles in a transparent dielectric, glass, or liquid exhibit striking optical properties.1 If the size of the particles is much smaller than the optical wavelength and penetration depth and their fractional volume concentration p ≪ 1, the optical properties of these materials are well accounted for by the MaxwellGarnett theory1 which leads.
80 citations
TL;DR: An experimental demonstration of phase conjugation using nonlinear metamaterial elements using active split-ring resonators loaded with varactor diodes to produce a time-reversed signal.
Abstract: We present an experimental demonstration of phase conjugation using nonlinear metamaterial elements. Active split-ring resonators loaded with varactor diodes are demonstrated theoretically to act as phase-conjugating or time-reversing discrete elements when parametrically pumped and illuminated with appropriate frequencies. The metamaterial elements were fabricated and shown experimentally to produce a time-reversed signal. Measurements confirm that a discrete array of phase-conjugating elements act as a negatively refracting time-reversal rf lens only $0.12\ensuremath{\lambda}$ thick.
80 citations