Holography materials

Holograms, silver and, 22 639, 657-658 Holographic applications, spectrally sensitized materials for, 9 519 Holographic interferometry, 19 588-589 Holography, optical, 27 421 Holst, Axel, 25 747 Homatropine hydrobromide, 4 360t Homatropine methylbromide, 4 360t Home desalinators, 26 55 Home scrap, 23 261, 262 Home water softeners, 22 818-819 Homobenzoate esters, aroma chemicals, 3 257... 

Apart from the laser the active materials in holography are those that are used to record the image onto a substrate. There are four main types of materials used for recording the image ... 

Nowadays, polymeric photoconductors may be used in electrophotography, microfilms, photothermoplastic recording, spatial light modulators, and nonlinear elements. The combination of photosensitivity with high quality electrical and mechanical properties permits the use of such materials in optoelectronics, holography, laser recording and information processes. The applications of the various types of polymers were reported in the final parts of the relevant items in the earlier sections. Here, we will briefly analyze the common features of photoconductive polymer applications. The separate questions of each type have been dealt with in some books and papers [3, 11, 14, 329]. 

The purple membrane is harvested semiindustrially from halobacteria mutants which are bred in fermenters. The BR is then embedded into a polymeric matrix of poly(vinyl alcohol) or polyacrylamide. The BR films manufactured in this way are used for different applications, preferably in holography, for example, as a reversible transient data storage system for optical information processing (159). Another example is real-time interferometry by using the property of BR films to integrate over time (160). BR has been proposed also as a two-photon memory material because of its unusually large two-photon cross section. 

Potential applications of photorefractive materials are manifold. To date, demonstrated effects include real time holography, correlation filtering, and various "novelty filter applications, one of which is the development of a microscope which distinguishes moving objects (such as living cells) from a stationary background.(149) The latter application employed BaTiC>3 as the active material. 

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