Topic
Diffraction efficiency
About: Diffraction efficiency is a research topic. Over the lifetime, 10320 publications have been published within this topic receiving 158298 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: Experimental results are reported for four-wave mixing at 633 nm with a photorefractive Bi(12)TiO(20) crystal in a double phase-conjugate mirror geometry that yields up to 40% diffraction efficiency for the hologram.
Abstract: Experimental results are reported for four-wave mixing at 633 nm with a photorefractive Bi12TiO20 crystal in a double phase-conjugate mirror geometry. Recording in the presence of an alternating electric field with optimum focusing of interacting Gaussian beams yields up to 40% diffraction efficiency for the hologram.
39 citations
TL;DR: In this article, the authors characterized the all-optical switching effect in holographic polymer-dispersed liquid crystal transmission gratings and optimized the polymer-based liquid crystal formulation to achieve a grating performance with a tunable diffraction efficiency of 78%.
39 citations
TL;DR: In this paper, a photorefractive-like grating formation was found in degenerate four-wave mixing experiments in pure nematic liquid crystals composed of rodlike molecules characterized by conjugated acetylene groups.
Abstract: We investigate a new ultrahighly sensitive nonlinear optical response in pure nematic liquid crystals composed of rodlike molecules characterized by conjugated acetylene groups. Under the combined application of low-intensity optical waves and dc electrical fields, a photorefractivelike grating formation has been found in degenerate four-wave mixing experiments. Polarization-dependent pump–probe experiments reveal the underlying orientational effect of a space-charge field. The photorefractive-like origin of the gratings was proved by two beam-coupling experiments in which a refractive-index grating was phase shifted by π/2 with respect to the interference grating. The huge optical nonlinearity found in such materials makes them promising for future applications in all-optical image processing and adaptive optics.
39 citations
TL;DR: In this article, an Al0.1Ga0.9As/GaAs photorefractive quantum well device with a near optimal input diffraction efficiency of 0.36% was presented.
Abstract: Photorefractive asymmetric Fabry–Perot quantum‐well structures yield significantly enhanced diffraction during four‐wave mixing by employing the sensitive amplitude and phase control of multiple‐beam interference within the device. We present an Al0.1Ga0.9As/GaAs photorefractive quantum‐well device with a near optimal input diffraction efficiency of 0.36% and an AlAs/GaAs quantum‐well device with an output diffraction efficiency of 200%.
39 citations
TL;DR: Photoinduced anisotropic self-diffraction in photorefractive KNbO(3) has been studied and it has been shown that this type of diffraction is ideally suited for spatial light modulation or incoherent-to-coherent conversion.
Abstract: Photoinduced anisotropic self-diffraction in photorefractive KNbO3 has been studied It has been shown that this type of diffraction is ideally suited for spatial light modulation or incoherent-to-coherent conversion A phase grating that is photoinduced by two coherent light beams causes the diffraction of one of the beams By spatially modulating the amplitude of the phase grating with an incoherent signal beam it is possible to transfer an incoherent image onto the coherent self-diffracted beam The performance parameters of this modulator are described with a simple model
38 citations