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1989 Second International Conference on Holographic Systems, Components and Applications

11-13 Sep 1989

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Displaying Results 1 - 25 of 47
  • Improvement of recording capability of silver halides emulsions by physical development

    Publication Year: 1989, Page(s):233 - 235
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    The authors aim to improve the bandwidth of reflection holograms. The parameters influencing the efficiency of the physical developer were optimized by measuring the modulation transfer function of sinusoidal reflection gratings. Changing the conditions of the physical development, the reflectance spectra of Denisyuk type reflection holograms were systematically recorded to measure the position of... View full abstract»

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  • Some applications of digital speckle pattern interferometry (DSPI)

    Publication Year: 1989, Page(s):227 - 232
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    Electronic/digital speckle pattern interferometry (ESPI/DSPI) is a promising field having a variety of applications in the measurement of displacement/deformation, vibration analysis, contouring, non-destructive testing, etc. The capability of ESPI/DSPI in displaying correlation fringes on a TV monitor is one of its distinct features. It serves as a convenient alternative for holographic technique... View full abstract»

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  • Harmonics and subharmonics of a grating in Bi12SiO20

    Publication Year: 1989, Page(s):101 - 105
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    The formation of gratings in photorefractive materials has been widely investigated over two decades for applications in non-linear optics, optical signal processing, optical storage and dynamic holography. Bismuth silicon oxide, Bi12SiO20, with its high sensitivity and fast response, has emerged as a very promising material for real-time applications. It is shown that when t... View full abstract»

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  • Dichromated holographic optical elements: a critical analysis of a proposed experimental procedure

    Publication Year: 1989, Page(s):223 - 226
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    Diffractive holographic optical elements are widely used in both simple and sophisticated optical systems due to the significant advantages they offer over their usual refractive and reflective counterparts. Dichromated gelatin (DCG) is the most widely used sensitive medium due to its high optical transparency, low scatter and high refractive index modulation capability. At CISE Holographic Labora... View full abstract»

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  • Adaptive interferometers using photorefractive crystals

    Publication Year: 1989, Page(s):95 - 100
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (448 KB)

    The authors report the detailed study of salient features of an adaptive interferometer operating via dynamic two-wave mixing in a cubic photorefractive Bi12SiO20 crystal. Specifically, they measured its transfer function and demonstrated its differentiating and adaptive properties. The latter means that the device can efficiently detect a weak high-frequency phase-modulated ... View full abstract»

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  • Holographic photolithography for submicron VLSI structures

    Publication Year: 1989, Page(s):127 - 132
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (820 KB)

    A holographic method of photolithographically printing the image of a photomask into a photoresist is presented. The holographic system, which can operate at either visible or UV wavelengths has been developed for high resolution VLSI integrated circuit manufacture. Submicron images of various typical IC features have been faithfully recorded using both the visible and UV wavelengths. The holograp... View full abstract»

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  • Fast rewritable computer generated hologram in photochromic material

    Publication Year: 1989, Page(s):218 - 222
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (164 KB)

    A high resolution light modulator which can be controlled in real time is useful as a parallel optical computing device. Also holography has many excellent characteristics such as multi-recorded memory and associative memory. For these purposes several kinds of optical calculating methods with interconnection are proposed. On the other hand, a computer generated hologram (CGH) can display any kind... View full abstract»

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  • Coding and quantization of computer generated Fresnel holograms

    Publication Year: 1989, Page(s):93 - 94
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    Computer generated holograms are thin diffractive structures with specified diffraction characteristics. In the Fourier case such a hologram possesses a desired Fraunhofer diffraction pattern. In order to obtain this pattern in a finite distance from the hologram plane it is illuminated by a convergent or divergent spherical wave. The application of a digital hologram as a diffraction optical elem... View full abstract»

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  • Copying reflection gratings in silver halide and dichromated gelatin

    Publication Year: 1989, Page(s):179 - 183
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (340 KB)

    The copying of holograms from one plate or material to another has been studied for several years. Copying allows a practical and flexible method for the reproduction of holographic optical elements (HOEs) or diffuse wave holograms. Contact interference copying has high stability and does not require strict coherence requirements from the light source. This is advantageous for copying into the mat... View full abstract»

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  • Adaptive running hologram recording and phase-shift measurement in photorefractive crystals

    Publication Year: 1989, Page(s):123 - 126
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    The author reports the use of phase modulation techniques in two-wave mixing (2WM) experiments for measuring the phase shift ψ between the interference pattern projected onto a photorefractive crystal and the resulting recorded hologram, as a function of the externally applied electric field E. Such data are used for computing the photoelectron trap density NA in the crystal. Phase ... View full abstract»

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  • Design of Fresnel holograms for optical interconnections of VLSI

    Publication Year: 1989, Page(s):213 - 217
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    Describes the design of a computer generated holographic optical element (HOE) interconnecting one-to-n optical components on the surface of a VLSI chip, through the use of an off-axis, binary hologram. The authors devise a novel way of drawing the patterns that compose the hologram: instead of using the conventional sampling technique, they derive an equation which describes the analytic behaviou... View full abstract»

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  • Electron beam written diffractive optical elements

    Publication Year: 1989, Page(s):80 - 84
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    Computer generated diffractive optical elements have been written in binary form in chrome on glass using the electron beam facilities at the Rutherford Appleton Laboratory in the UK. Some of the properties of polygonal elements are considered. These elements have been used as masters for subsequent copying into DCG to obtain higher diffraction efficiencies View full abstract»

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  • Hologram interferometry as a tool to investigate transient waves in mechanics

    Publication Year: 1989, Page(s):1 - 5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (596 KB)

    Hologram interferometry is a very competitive tool for the study of transient events like the propagation of bending waves in plates and shells, to visualize shock waves in phase objects like air or water or just to record double exposure holograms of modes of vibration in optical modal analysis. A number of experiments to visualize wave propagation in solids and liquids are presented View full abstract»

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  • Dammann grating array generators in amorphous silicon nitride

    Publication Year: 1989, Page(s):90 - 92
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors give expressions for the power spectrum of a Dammann grating and present some advances in optimisation of the grating structure by stochastic algorithms. They then proceed to their experimental results in the fabrication of these elements in silicon nitride. Conventional photolithographic and electron-beam lithographic techniques are employed to construct the amplitude mask, which is c... View full abstract»

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  • Optimum coding of binary data for holographic matched filters

    Publication Year: 1989, Page(s):173 - 178
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    The searching of large data bases to retrieve unindexed information involves search times of many seconds. It is clearly an operation where a high order of parallelism could pay dividends and hence an optical approach based on a holographic matched filter looks interesting. The matched filter system consists of an input plane, a Fourier transforming lens, a holographic recording or Fourier transfo... View full abstract»

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  • The use of multiplexed holographic filters in coherent optical processors

    Publication Year: 1989, Page(s):164 - 168
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (388 KB)

    The demand for on-line vision systems capable of performing image analysis at high throughput is steadily increasing. Major application fields are quality assurance (QA) and automated assembly or production lines. Currently available systems rely heavily on digital image processing techniques to perform the necessary tasks. The data processing capability of analogue coherent optical processors (CO... View full abstract»

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  • Large modulation effects in photorefractive crystals

    Publication Year: 1989, Page(s):116 - 122
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (436 KB)

    A numerical solution to the band transport equations is presented, which is quite general, and predicts the behaviour of photorefractive materials in the saturation limit with a moving grating. The band transport equations are solved by a secular perturbation method, where the perturbation parameter is the fundamental component of the induced space charge field. In this manner, one can predict the... View full abstract»

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  • Preliminary evaluation of 144×144 holographic interconnection system

    Publication Year: 1989, Page(s):195 - 199
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    The authors report on the design and experimental characterization of an holographic system which enables slowly reconfigurable interconnections between 144 inputs and 144 outputs. Some possible implementations are discussed and experimental data obtained by using photothermoplastics are presented. They have used this material because it offers an high recording sensitivity combined with significa... View full abstract»

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  • Reduction of aberrations in underwater holography

    Publication Year: 1989, Page(s):21 - 24
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    Holographic measurements of engineering objects made in air have been extended to underwater measurement. This requires that the hologram of an object recorded in water is replayed in air which results in image degradation, especially at large field angles. The effect is basically that of an observer in air viewing an object in water and is caused by the change in refractive index. A technique is ... View full abstract»

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  • Small aperture holographic lenses for optical interconnect applications

    Publication Year: 1989, Page(s):209 - 212
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    The limits on holographic lens performance are discussed. The need to make the lenses with visible light then use them in the infrared is identified as a key consideration. Small size is found to be beneficial in controlling aberrations. Coupling of light into a single mode fibre with a wavelength shifted holographic lens is demonstrated View full abstract»

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  • A two dimensional diffraction grating incorporating a variable grating mode (VGM) liquid crystal device (LCD)

    Publication Year: 1989, Page(s):154 - 159
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (696 KB)

    The variable grating mode (VGM) effect which some nematic liquid crystal materials display is considered. An investigation is described which was initiated by a desire to see if a truly DC effect could be produced and at what orientation the grating `rolls' could actually be observed. It was possible to produce phase grating patterns both parallel to and perpendicular to the cell alignment directi... View full abstract»

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  • The manufacture of blazed oblique zone plates for use at 10.6 μm

    Publication Year: 1989, Page(s):76 - 79
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (556 KB)

    The authors have demonstrated that it is possible to produce blazed zone plates with high efficiency, good focal properties and unusual geometries and which are suitable for use in the 10 μm spectral region. The method of plotting the pattern of zones on a grey scale phototypesetter and photoreducing into resist proved to be simple and straightforward for the present application. its virtue is ... View full abstract»

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  • Development of a pulse laser system for the production and copying of holographic stereograms

    Publication Year: 1989, Page(s):51 - 55
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    Advances in computer technology, computer aided design (CAD) and graphics equipment have led to displays of three dimensional objects with perspective correction and full shading. The final format of the output is restricted to two dimensions, limiting the visual impact and usefulness of the technique. The potential of synthetic holograms, and in particular holographic stereograms, to produce a fu... View full abstract»

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  • Second International Conference on Holographic Systems, Components and Applications (Conf. Publ. no.311)

    Publication Year: 1989
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (28 KB)

    The following topics were dealt with: holography in measurement; display holography; computer generated holograms; photorefraction and phase conjugation; holographic optical elements; and optical interconnects View full abstract»

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  • Dynamical-phase-modulated holography (DPMH)-a method for measuring hologram formation mechanisms and the nonlinear refractive index

    Publication Year: 1989, Page(s):106 - 110
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors describe the features distinguishing phase-modulated holography from phase-intensitive experiments. Dynamical-phase-modulated holography is an extension of the theory of PMH in order to measure additionally relaxation time constants in a range limited only by the modulation technique of choice. Another extension of this method is a 4-beam technique with separate write and read-out beam... View full abstract»

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