Color holograms

Troubleshooting Trouton constant Troxerutin [7085-55-4] Troysan 174 Troysan 192 True color holograms TrueType Truex process Truncatella sp. Truscottite [12425-42-2] Truxal Trycol... 

As emerges from Figures 1 all variables have six concentration levels, i.e. the total number of combinations in this experimental space is 1296. The activity of samples above 89 % conversion is shown by a white color, while that of below 50 % is shown by black. The maximum value of conversion is shown by a cross. The analysis of these holograms shows the following activity composition relationship ... 

Photoreduction of Eosin, Erythrosin, and Rose Bengal with amines has been employed for a number of years to initiate polymerization of monomers in the absence of solvent. Examples of recent applications include the production of volume holograms [181], color images on plain paper [182], printing plates [183-185], and, in the presence of suitable peroxides, manufacture of coatings for glass fibers [186]. 

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... 

For the central pixel of the hologram with coordinates (0,0) and the color based on the formulas in (2), we obtain the following parameters of the diffraction... 

Equations (8) can be used for holograms of up to 1.5xl.5 cm in size, with holograms of larger sizes demonstrating a noticeable color distortion and irregularity of the brightness of pixels in the hologram area. 

In 1968 electrical engineer Stephen Benton developed the rainbow hologram-as the observer moves his head, he sees the spectrum of color as in a rainbow. This type of hologram can also be viewed in white light. 

To produce wavelengths in color, the most frequently used lasers are the helium-neon (for red) and the argon-ion (for blue and green). Lasers at one time were expensive and sometimes difficult to obtain, but modern-day lasers can be relatively inexpensive and easier to use for recording holograms. 

Holography in one form or another is prevalent in modern society, whether as a security feature on a credit card, a component of a medical technique, or a colorful wrapping paper. Holograms have heen interwoven into daily life and will likely continue to increase their impact in the future. 

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