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Diffraction efficiency

About: Diffraction efficiency is a research topic. Over the lifetime, 10320 publications have been published within this topic receiving 158298 citations.


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Journal ArticleDOI
TL;DR: By scaling the spatial variables by the wavelength, it is shown that diffracted radiance is shift invariant in direction cosine space and simple Fourier techniques can now be used to predict a variety of wide-angle (nonparaxial) diffraction grating effects.
Abstract: Scalar diffraction theory is frequently considered inadequate for predicting diffraction efficiencies for grating applications where λ/d>0.1. It has also been stated that scalar theory imposes energy upon the evanescent diffracted orders. These notions, as well as several other common misconceptions, are driven more by an unnecessary paraxial approximation in the traditional Fourier treatment of scalar diffraction theory than by the scalar limitation. By scaling the spatial variables by the wavelength, we have previously shown that diffracted radiance is shift invariant in direction cosine space. Thus simple Fourier techniques can now be used to predict a variety of wide-angle (nonparaxial) diffraction grating effects. These include (1) the redistribution of energy from the evanescent orders to the propagating ones, (2) the angular broadening (and apparent shifting) of wide-angle diffracted orders, and (3) nonparaxial diffraction efficiencies predicted with an accuracy usually thought to require rigorous electromagnetic theory.

47 citations

Journal ArticleDOI
TL;DR: In this paper, the authors use the calculus of variations to give a general theory for finding optimal square and hexagonal phase gratings for beam splitting, and show that the calculus can be used to find a general solution to the problem of beam splitting.
Abstract: We use the calculus of variations to give a general theory for finding optimal square and hexagonal phase gratings for doing beam splitting.

47 citations

Journal ArticleDOI
TL;DR: In this paper, a photorefractive polymer system based on a substituted polysiloxane backbone is described, which exhibits high holographic diffraction efficiency and reasonable writing speed, in addition to high optical clarity and low optical scattering characteristics.
Abstract: A photorefractive polymer system based on a substituted polysiloxane backbone is described. In addition to high holographic diffraction efficiency and reasonable writing speed, the material reported exhibits excellent optical clarity and low optical scattering characteristics. These latter optical properties are necessary in high density holographic digital data storage applications. The utility of the polysiloxane based photorefractive polymers for storage applications is demonstrated by recording digital data at a density of 0.52 Mbit/cm2 and reading it back without error.

47 citations

Journal ArticleDOI
TL;DR: A detailed experimental study of the relaxation of holographic gratings in disordered materials is presented in this article, where relaxational selfenhancements of gratings were found up to 18 times with respect to the initial diffraction efficiency, with a saturation value stable over a period of more than 2 years.
Abstract: A detailed experimental study of the relaxation of holographic gratings in disordered materials is presented. Relaxation parameters of holographic gratings in nonannealed As2S3 amorphous semiconductor films have been measured as a function of aging time, initial diffraction efficiency, recording light intensity, and grating period. The influence of the readout light intensity and sample thickness and its temperature has also been investigated. Relaxational self‐enhancements of gratings were found up to 18 times with respect to the initial diffraction efficiency, with a saturation value stable over a period of more than 2 years. The relaxational self‐enhancement effect is explained in terms of a phenomenological relaxation model with periodically distributed stress. Under certain conditions, a spatially periodic mechanical stress field resulting from a holographic grating causes anomalous diffusion of unfilled sites. This leads to a density modulation which increases the initial refractive index modulation...

47 citations

Journal ArticleDOI
TL;DR: In this article, the most promising applications of diffractive beam splitting are discussed, including spot array generation, multiple and multifocal imaging, matched filtering, laser beam mode selection and simultaneous contour shaping.
Abstract: Recent advances in diffractive optics theory and technology have made it possible to design programmable, multichannel optical systems based on diffraction gratings, lenslet arrays and digital holography algorithms. Spot array generation, multiple and multifocal imaging, matched filtering, laser beam mode selection and simultaneous contour shaping are among the most promising applications of diffractive beam splitting.

47 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202391
2022188
2021167
2020223
2019259
2018259