Kaveh Bazargan

River Valley Technologies

One of the holy grails in display holography is the production of natural color holographic images. Various sets of wavelengths for recording have been suggested, some favoring three wavelengths, some four, and even more. I will argue that the choice of recording wavelengths is completely independent of the holographic process; it was in fact was s...

An important advantage of eBook readers is their ability to modify text size and page orientation for the most comfortable reading configuration. The eBook reader has to reformat the text on the fly and with minimum delay. Current eBook readers (e.g. Stanza on the iPhone) can do this reformatting, but cannot deal with complicated text such as mathe...

The problem of predicting and previsualizing the distortions and aberrations in a holographic image is discussed, particularly for the case of pictorial, or display holograms. The mathematical procedure for predicting these attributes is outlined, followed by a brief outline of a computer program (HoloPov), written in the Pov-Ray language, that can...

The relationship between refractive index modulation parameters and beam ratio is examined experimentally and theoretically for multiple-exposure holograms, both for the case of simultaneous and sequential recordings. These parameters are determined by measuring the diffraction efficiency of each main grating. Using the measurements, the optimum be...

Publishers now expect a variety of electronic �les from the typesetter, both for publishing, and for archiving. And yet, the publishing industry, by and large, still follows the traditional "manuscript/edit/typeset/proofread/print" approach. The process is still essentially paper-based. The typesetting is also geared primarily towards paper output...

Holography is a powerful optical technique for recording and displaying 3D information. In this chapter we discuss the application of holography in the display of tomographic data. It helps to have a good understanding of 3D perception in order to determine whether holography can be used beneficially in the display of scientific and medical data. F...

Factors affecting the choice of producing wavelengths for recording true-color holograms are examined. It is argued that the choice of wavelengths is largely independent of the method used for recording and, in fact, largely independent of holography. It is shown that a large area of the CIE chart need not be covered and that, in fact, choosing wav...

A viewing system is proposed for viewing reflection holograms conveniently, and with acceptably low chromatic dispersion. The angles of reconstruction and viewing are such that close examination of the image is possible

Colour rendition in true-colour holograms is critically dependent on the choice of laser wavelengths used in the recording. It has traditionally been assumed by researchers in colour holography that the major goal in choosing suitable wavelengths for recording is that as great an area of the CIE chromaticity diagram as possible is covered. It is pr...

An optical system is described which is capable of recording multicolour white-light-viewable holograms in a single recording stage. The hologram can be of the transmission or the reflection type, exhibits no chromatic aberrations and very low geometric distortions and third-order aberrations. Factors affecting the choice of optimum recording wavel...

We have investigated exposure parameters for deep-red holography using a junction laser and silver-halide holographic emulsion to record single-beam reflection phase-volume holograms recorded and reconstructed at a wavelength of 750 nm. We present measurements of the variation of diffraction efficiency and its derivative efficiency with exposure en...

We have developed a semi-automatic system for the production of holograms from multislice image data, particularly tomographic medical data such as CT and MRI scans. This system produces "volumetric multiplexed" holographic images which exhibit full parallax in both the vertical and horizontal directions along with true perspective in depth, and wh...

We suggest the use of a pinhole imaging hologram as a new approach for optical interconnects. It can avoid the formation of intermodulation gratings and has some other advantages. On recording, the object beam passes through a pinhole thus forming an image plane hologram, but when reconstructing the pinhole can be removed. The reconstructed image c...

A hologram viewing apparatus, an integral direct viewing hologram device and an article useful in the manufacture of hologram devices are predicated upon a particular set of components grouped according to a number of permutations. The viewing apparatus comprises a screen consisting of at least a plane grating, the hologram device comprises a venet...

A new method of producing multicolour holograms is proposed. The method is based on the technique of dispersion compensation, and exploits the wavelength selectivity of volume holograms. The colour saturation of the resultant image increases with increasing wavelength selectivity of the hologram.

A hologram viewing system is described which produces sharp, achromatic, full-parallax images from transmission holograms. The viwinc, system is based on the principle of dispersion compensation, and produces images of low aberrations and distortion. The viewing system is ideal for compact, portable displays, and eliminates the need for individual...

The aim of this report is firstly to review colour display holography and secondly to present some of the work carried out in our laboratories in this field, An historical introduction is presented, setting out key events in the development of colour holography, and several historical parallels are drawn with colour photography. Laser illuminated c...

Image-plane holograms, made using the two-stage process of Rotz and Friesem, provide achromatic or near-achromatic images only when the image straddles the plane of the second hologram. It is shown that in certain circumstances it is possible to generate nearly-achromatic images which appear to lie completely behind the second hologram plane.

One of T E X's advantages over traditional typesetting systems is the mechanism to stretch horizonal and vertical glue as needed, in order to aid paragraph building and pagination. But all T E X operators involved in day-to-day page make-up know that this inbuilt intelligence is often 'too clever' and frustrating for the user. T E X will not do wha...