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Krakow, Gary. "How to Make Holograms at Home." MSNBC. 5/6/2005 (4/9/2007) http://www.msnbc.msn.com/id/7759505/ The progression of lens design for later emulsions is of practical importance when considering the use of old lenses, still often used on large-format equipment; a lens designed for orthochromatic film may have visible defects with a color emulsion; a lens for panchromatic film will be better but not as good as later designs.
Sensitivity across the visible spectrum means you don't need different film for different lasers. And if you want to make full-color holograms, expose with multiple wavelengths in one material! Real Holograms Spectratek Technologies is the industry leader in Holographic Diffraction, Fresnel Lens, Engraved, and SpectraSteel Decorative Films, creating the brightest and most vivid visually active surfaces for over 40 years.
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The development of the laser enabled the first practical optical holograms that recorded 3D objects to be made in 1962 by Yuri Denisyuk in the Soviet Union [6] and by Emmett Leith and Juris Upatnieks at the University of Michigan, US. [7] Early holograms used silver halide photographic emulsions as the recording medium. They were not very efficient as the produced grating absorbed much of the incident light. Various methods of converting the variation in transmission to a variation in refractive index (known as "bleaching") were developed which enabled much more efficient holograms to be produced. [8] [9] [10] Claire Elise Campton (17 August 2016). "Film Photography". Photopholio. Archived from the original on 19 September 2016 . Retrieved 17 August 2016. Several different materials can be used as the recording medium. One of the most common is a film very similar to photographic film ( silver halide photographic emulsion), but with much smaller light-reactive grains (preferably with diameters less than 20nm), making it capable of the much higher resolution that holograms require. A layer of this recording medium (e.g., silver halide) is attached to a transparent substrate, which is commonly glass, but may also be plastic. Europe | Fujifilm Global". www.fujifilm.com. Archived from the original on 2021-08-25 . Retrieved 2021-08-27.
Photographic film is a strip or sheet of transparent film base coated on one side with a gelatin emulsion containing microscopically small light-sensitive silver halide crystals. The sizes and other characteristics of the crystals determine the sensitivity, contrast, and resolution of the film. [1] Film is typically segmented in frames, that give rise to separate photographs.
Holographic Projection
The first flexible photographic roll film was sold by George Eastman in 1885, [43] but this original "film" was actually a coating on a paper base. As part of the processing, the image-bearing layer was stripped from the paper and attached to a sheet of hardened clear gelatin. The first transparent plastic roll film followed in 1889. [44] It was made from highly flammable cellulose nitrate film. If parts of the image are exposed heavily enough to approach the maximum density possible for a print film, then they will begin losing the ability to show tonal variations in the final print. Usually those areas will be considered overexposed and will appear as featureless white on the print. Some subject matter is tolerant of very heavy exposure. For example, sources of brilliant light, such as a light bulb or the sun, generally appear best as a featureless white on the print. a b Francois (30 January 2008). "The DX story – or how the coding works". filmwasters.com. Archived from the original on 3 October 2015 . Retrieved 8 August 2015. Real-time 3D holography would enhance a slew of systems, from VR to 3D printing. The team says the new system could help immerse VR viewers in more realistic scenery, while eliminating eye strain and other side effects of long-term VR use. The technology could be easily deployed on displays that modulate the phase of light waves. Currently, most affordable consumer-grade displays modulate only brightness, though the cost of phase-modulating displays would fall if widely adopted. A simple hologram can be made by superimposing two plane waves from the same light source on a holographic recording medium. The two waves interfere, giving a straight-line fringe pattern whose intensity varies sinusoidally across the medium. The spacing of the fringe pattern is determined by the angle between the two waves, and by the wavelength of the light.
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