Holography hologram

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... 

Another important optical phenomena that relies on light interference and diffraction is holography, the process by which holograms (interference patterns) are produced. Whilst holograms are best known for the reproduction of near perfect 3D images of an object in the graphic arts, they also find apphcations in newer areas such as laser eye protection, LCDs, diffractive optical elements, optical processing... 

Photoresists. These are used in holography because they can be employed to map holographic exposures into surface relief. This property is utilised in the production of embossing masters, reflection and transmission gratings and in computer generated holograms. 

Figure 9. Two holodiagrams (a) holography—the ordinary static holodiagram in which A is the light source, B is the point of observation (e.g., the center of the hologram plate), while C is an object for which the k value is 1/cos a (b) the dynamic holodiagram in which an experimenter emits a picosecond pulse at (A) and thereafter runs with a velocity close to the speed of light and makes a picosecond observation at B. The k value is as before ...

N. H. Abramson, The holo-diagram A practical device for the making and evaluation of holograms Proc. Applications of Holography, Strathclyde, Glasgow, 1968, pp. 45-55. 

Y. N. Denisyuk, D. I. Staselko, and R. R. Herke, On the effect of the time and spatial coherence of radiation source on the image produced by a hologram, Proc. Applications of Holography, Section 2, Besancon, 1970, pp. 1-8. 

Figure 6. (Left) Schematic showing basic TEM configuration for off-axis electron holography and (b) photograph showing electron microscope suitably equipped for recording holograms of magnetic materials.

Spiropyrans show promise for optical recording, three-dimensional optical memories,214 and holography.215 The dyes currently under study for these applications very probably will not be used merely dissolved in a bulk polymer matrix, but will be oriented in films and membranes, or adsorbed or vapor deposited on solid substrates to take advantage of the nonlinear optical properties of the colored forms. For example, thick (0.5 mm) PMMA films of 6-nitro-thiaBIPS can be used to record wavelength-multiplexed volume holograms with an infrared diode laser. This system is impractical at present because of fatigue and poor diffraction efficiencies.216... 

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