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# 1989 Second International Conference on Holographic Systems, Components and Applications

## Filter Results

Displaying Results 1 - 25 of 47
• ### A holographic system for aerodynamic testing

Publication Year: 1989, Page(s):6 - 15
| | PDF (740 KB)

The authors investigate the suitability of holography as an optical flow diagnostic for turbofan nozzle flow structures. In this case a static 1/25th scale model of a powered turbo-fan nacelle has used for nacelle/wing integration studies and evaluated using a holographic technique. The holograms made show the core jet and the by-pass flow as it emerges from the nacelle nozzle system. They also sh... View full abstract»

• ### Replication techniques: different procedures for recording 2D, 3D images and transmission holographic optics

Publication Year: 1989, Page(s):45 - 48
| | PDF (400 KB)

Embossing procedures have been fully performed for rainbow 2D and 3D holograms and zone plates of the on-axis and off-axis design. Computer generation of the holographic optical elements is under development to obtain complex optical functions with high efficiency by proper fringe modeling techniques View full abstract»

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

Publication Year: 1989, Page(s):1 - 5
| | PDF (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»

• ### Embossed volume holograms: the Aztec structure

Publication Year: 1989, Page(s):38 - 44
Cited by:  Patents (2)
| | PDF (744 KB)

Embossed holograms are surface-relief structures that typically result from recordings made interferometrically by the off-axis technique, where the fringe maxima lie on planes predominantly perpendicular to the recording surface and with an intensity variation that is sinusoidal. A new type of holographic recording called Aztec is discussed that combines features of off-axis and volume recording ... View full abstract»

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

Publication Year: 1989, Page(s):154 - 159
| | PDF (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»

• ### Multigrating phase conjugation in photorefractive crystals; effect of unequal coupling strengths and absorption on the PCR

Publication Year: 1989, Page(s):111 - 115
| | PDF (356 KB)

The authors analyze the problem of determining the influence of four index grating types, namely, transmission, reflection, pump and signal with arbitrary relationships of their strengths. For this they solve the coupled-wave equations numerically, using a shooting and matching technique. The governing coupled-wave equations needed to solve the problem of multigrating phase conjugation in a more g... View full abstract»

• ### A new approach to the extraction of phase data from interferometric fringe patterns

Publication Year: 1989, Page(s):33 - 37
| | PDF (296 KB)

It is shown that the single phase step technique has some definite advantages over those using more phase steps. It gives a computationally simple solution for 0(x,y) performed at greatly increased speed utilising an 8-bit look-up table. Only one phase step is required which practically eliminates environmental drift errors, which is especially important at the data acquisition stage. Because it n... View full abstract»

• ### Holographic photolithography for submicron VLSI structures

Publication Year: 1989, Page(s):127 - 132
| | PDF (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»

• ### Limitations on the performance of very thick volume reflection gratings

Publication Year: 1989, Page(s):149 - 153
| | PDF (300 KB)

The authors present an analysis of the trade-offs for the production of volume reflection gratings. The main object of the investigation is the production of narrow-band reflection filters, position tuneable over the 1200-1600 nm range for optical fibre systems applications. Results showing a very good performance, close to theoretical predictions, for 100 micron thick films, results for 500 micro... View full abstract»

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

Publication Year: 1989, Page(s):106 - 110
| | PDF (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»

• ### Coding and quantization of computer generated Fresnel holograms

Publication Year: 1989, Page(s):93 - 94
| | PDF (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»

• ### Thermal stress in thin films using real-time holographic interferometry

Publication Year: 1989, Page(s):29 - 32
| | PDF (216 KB)

A study has been undertaken to set up a novel technique of measurement of thermal stress of thin films using real-time holographic interferometry. Using this technique thermal stress in conductive coatings has been studied and some results on iron and copper films are presented View full abstract»

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

Publication Year: 1989, Page(s):223 - 226
| | PDF (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»

• ### Electron beam written diffractive optical elements

Publication Year: 1989, Page(s):80 - 84
| | PDF (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»

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

Publication Year: 1989, Page(s):123 - 126
| | PDF (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»

• ### Edge-addressed holograms-a novel approach towards narrow bandwidth filters

Publication Year: 1989, Page(s):138 - 148
| | PDF (440 KB)

The authors outline a novel approach towards achieving the properties of an extremely thick reflection hologram (≳500 microns) i.e. high angular and spectral selectivity, from a comparatively thin film of holographic material (≈100 microns). The method involves fabricating a conventional thin' transmission hologram and interrogating this via an exposed edge of the film using a focussed Ga... View full abstract»

• ### Harmonics and subharmonics of a grating in Bi12SiO20

Publication Year: 1989, Page(s):101 - 105
| | PDF (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»

• ### Improvement of recording capability of silver halides emulsions by physical development

Publication Year: 1989, Page(s):233 - 235
| | PDF (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»

• ### Dammann grating array generators in amorphous silicon nitride

Publication Year: 1989, Page(s):90 - 92
| | PDF (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»

• ### Large deformation analysis by holographic interferometry

Publication Year: 1989, Page(s):25 - 28
| | PDF (752 KB)

The method presented permits one to study large deformation quantitatively by a simple compensation technique: in real-time, the modification of the reference beam direction delivers the three components of the displacement, and the modification of the object beam direction provides the strain and rotation components of the surface element. For an object which may show large deflections under norm... View full abstract»

• ### Fast rewritable computer generated hologram in photochromic material

Publication Year: 1989, Page(s):218 - 222
Cited by:  Patents (1)
| | PDF (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»

• ### Optimum coding of binary data for holographic matched filters

Publication Year: 1989, Page(s):173 - 178
| | PDF (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»

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

Publication Year: 1989, Page(s):76 - 79
| | PDF (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»

• ### Design and fabrication of HOE for clock distribution in integrated circuits

Publication Year: 1989, Page(s):204 - 208
Cited by:  Papers (1)  |  Patents (1)
| | PDF (356 KB)

The authors present the design and fabrication of HOE for clock distribution. The set-up consists of a HOE imaging a source (semiconductor laser) onto multiple photodetectors in an integrated circuit. They have studied and fabricated a multi-focus doublet HOE. The aberrations due to the wavelength shift between recording (λ-488 nm) and reconstruction (λ=780 nm) have been minimized by... View full abstract»

• ### Stroboscopic holographic interferometry applied to the vibration of engineering structures and machines

Publication Year: 1989, Page(s):16 - 20
| | PDF (520 KB)

It is shown that stroboscopic holography can be usefully applied to study the vibration of large machines. It has been demonstrated that a great deal of complementary information can be gained from the stroboscopic technique compared with the normal time-average method, in particular damping characteristics and cyclic idiosyncrasies can be evaluated View full abstract»