Topic
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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TL;DR: A new optical device whose reflection intensity can be electrically controlled at specific wavelengths has been demonstrated that has a liquid-crystal/polymer multilayer structure formed by holography.
Abstract: — A new optical device whose reflection intensity can be electrically controlled at specific wavelengths has been demonstrated. This device has a liquid-crystal/polymer multilayer structure formed by holography. The diffraction efficiency for Ar-laser light is about 70%. The reflection intensity can be electrically controlled with a response time of less than 1 ms.
101 citations
TL;DR: In this paper, the authors measured the efficiency of diffraction of 45 −275 eV x rays into orders by interferometrically formed, electrodeposited, gold transmission gratings on the 4° beam line at the Stanford Synchrotron Radiation Project (SSRP).
Abstract: Efficiencies for diffraction of 45–275-eV x rays into orders by interferometrically formed, electrodeposited, gold transmission gratings have been measured on the 4° beam line at the Stanford Synchrotron Radiation Project (SSRP). Anomalous dispersion affects the observed efficiency since the gold is partially transmitting to x rays. Model calculations which include anomalous dispersion are in good agreement with observations. With a suitable choice of material and thickness, a grating can be optimized for a given wavelength range by reducing the zero order transmission and enhancing the higher orders. Even orders are suppressed for a grating with equal slit and wire sizes.
101 citations
TL;DR: In this paper, an improved root-finding algorithm was proposed for the solution of the eigenvalue equation associated with the diffraction formalism for lossy lamellar gratings.
Abstract: We outline an improved root-finding algorithm necessary for the solution of the eigenvalue equation associated with the diffraction formalism for lossy lamellar gratings. A numerical example is presented, demonstrating the adequacy of this technique for a highly-conducting aluminium grating.
101 citations
TL;DR: A mechanism is proposed that correlates the observed electrically controlled holographic response with the dielectric behavior of the crystal and is used to implement a novel, layered optical memory having no moving parts and having electrical access for writing or reading selected layers.
Abstract: Holographic storage experiments using crystal Sr(0.75)Ba(0.25)Nb(2)O(6) (SBN 75/25) as a volume-phase holographic medium show that this material is the most sensitive crystalline storage medium yet discovered. An exposure level of 0.003 J/cm(2) at 0.488 microm produces a 1% diffraction efficiency in a 5-mm length of crystal. In addition to high recording sensitivity, SBN 75-25 exhibits interesting electric-field induced effects that include electric-field enhanced recording sensitivity and voltage-switchable latent-to-active holographic reconstruction efficiency. These effects are explained in terms of drift and diffusion of photoionized carriers coupled with the nonlinear electrooptic behavior characteristic of this low Curie temperature ferroelectric crystal. Detailed measurements of the holographic recording and reconstruction properties of thick phase-volume holograms stored in SBN 75/25 are reported. A mechanism is proposed that correlates the observed electrically controlled holographic response with the dielectric behavior of the crystal. These interesting effects are used to implement a novel, layered optical memory having no moving parts and having electrical access for writing or reading selected layers. An experimental model of the layered memory was constructed to demonstrate the interrelation of the several phenomena involved in the layered concept.
101 citations
Patent•
22 Aug 2007
TL;DR: In this article, a light-transmissive substrate having a plurality of diffractive optical elements is designed and constructed to relay at least a portion of a light beam emanating from an object to at least one predetermined eye box in a manner such that for each point of the object, there is a set of parallel outgoing light rays originating from the point and arriving to the eye box.
Abstract: An optical relay comprises a light-transmissive substrate having a plurality of diffractive optical elements, where at least one diffractive optical element is characterized by nonuniform diffraction efficiency. The substrate and diffractive optical elements are designed and constructed to relay at least a portion of a light beam emanating from an object to at least one predetermined eye-box in a manner such that for each point of the object, there is a set of parallel outgoing light rays originating from the point and arriving to the eye-box. The color difference between any two parallel light rays of the set is less than 50 ΔE* units.
101 citations