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Author: Kharusi, Muhammed S
Publisher: National Library of Canada
ISBN:
Category :
Languages : en
Pages :
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![Diffraction in Anisotropic Crystals [microform] PDF](https://books.google.com/books/content/images/frontcover/yDF3tgAACAAJ?fife=w80-h100)
Author: Kharusi, Muhammed S
Publisher: National Library of Canada
ISBN:
Category :
Languages : en
Pages :
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Author: Muhammmed Samir Al-Kharusi
Publisher:
ISBN:
Category : Diffraction
Languages : en
Pages : 0
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"A theoretical and experimental study on acoustic, optical and acoustooptic diffraction in anisotropic crystals is presented. It is shown that even though optical activity in quartz introduces only very small changes in the optical wave vector loci, its effects on acoustooptic diffraction geometry are nevertheless easily measurable. A calculation procedure for the diffraction angles incorporating optical activity is described and then experimentally verified. Topez, an optically biaxial crystal, is used to demonstrate the effects on shear-wave acoustooptic diffraction geometry of acoustic propagation along other thon symmetry axes and of interaction in nonsymmetry planes. The diffraction field of a plane aperture or a plane transducer in a highly anisotropic crystal is calculated by means of an angular spectrum of plane waves representation for which the phase velocity surface need only be defined numerically. This theory is experimentally verified by observing optical diffraction from a slit-type aperture in a biaxial crystal and by acoustooptic probe measurements of quasi-longitudinal and quasi-shear ultrasonic beam profiles under conditions of very high elastic anisotropy. Further verification is achieved by using published experimental measurements of ultrasonic surface wave beam profiles on lithium niobate. It is demonstrated that excellent agreement between theory and experiment is possible. Finally, the formalism and associated computational techniques are extended in order to examine various relevant problems in the diffraction and focusing of elastic surface waves."--
Author: M. S. Kharusi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Muhammed S. Kharusi
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Book Description
The paper discusses various aspects of diffraction and focusing for waves in anisotropic crystals, and the concepts are applicable to electromagnetic, ultrasonic bulk, or ultrasonic surface waves in homogeneous but arbitrarily anisotropic crystals. A numerical technique based on an angular spectrum of plane waves representation is shown to produce theoretical intensity profiles in good agreement with acoustooptic probe measurements of the diffraction field of a slit-type ultrasonic transducer launching quasi-longitudinal and quasi-shear waves in quartz along on axis of extreme anisotropy where the wave normal and the direction of energy flow are separated by angles greater than 20 degrees. (Author Modified Abstract).
Author: José Edimar Barbosa Oliveira
Publisher:
ISBN:
Category : Acoustooptics
Languages : en
Pages : 346
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Author: Peter David Foote
Publisher:
ISBN:
Category :
Languages : en
Pages : 870
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Author: Muhammed Samir Kharusi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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"Acoustooptic diffraction angles are expected to differ greatly from Bragg geometry when one uses optically anisotropic crystals and a rotation of the light polarisation takes place, since then the magnitudes of the two light wave vectors can be appreciably unequal. The only orientation that has been explicitly worked out prior to this thesis is that in which all the wave vectors are confined to the xy plane of uniaxial crystals. For this orientation, the two refractive indices involved are not direction dependent. In this thesis, the geometries for an interaction plane involving the optic axis in uniaxial crystals are calculated algebraically, first for an acoustic wave vector parallel and then perpendicular to the optic axis. In both cases one of the refractive indices is direction dependent. A computer program has also been written for numerically calculating the diffraction angles for all orientations and all directions of acoustic propagation in both uniaxial and biaxial crystals. A feature introduced in this program is that the crystal faces and their orientation with respect to other vectors is taken into account. Results obtained from the general, computer program agree with the results of all the three special cases and several geometries for biaxial crystals are presented."--
Author: Mikhail Aleksandrovich Krivoglaz
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 496
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Author: A. S. Andrushchak
Publisher: Cambridge Scholars Publishing
ISBN: 1527512037
Category : Science
Languages : en
Pages : 213
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Book Description
This book addresses analytical descriptions and geometric representations of the spatial anisotropy of induced optical effects in crystalline materials of different symmetry classes, as well as experimental methods and apparatus for the comprehensive studies of electro-, piezo-, elasto- and acousto-optic phenomena in crystalline solids. It also details 3D analysis of the anisotropies of linear electro-optic, piezo-optic, elasto-optic, acoustic and acousto-optic properties of various crystalline materials and constructs indicative or extreme surfaces describing the anisotropy effect.
Author: Eric J. Mittemeijer
Publisher: Springer Science & Business Media
ISBN: 3662067234
Category : Science
Languages : en
Pages : 557
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Book Description
Overview of diffraction methods applied to the analysis of the microstructure of materials. Since crystallite size and the presence of lattice defects have a decisive influence on the properties of many engineering materials, information about this microstructure is of vital importance in developing and assessing materials for practical applications. The most powerful and usually non-destructive evaluation techniques available are X-ray and neutron diffraction. The book details, among other things, diffraction-line broadening methods for determining crystallite size and atomic-scale strain due, e.g. to dislocations, and methods for the analysis of residual (macroscale) stress. The book assumes only a basic knowledge of solid-state physics and supplies readers sufficient information to apply the methods themselves.
