The challenge nowadays is to build high-resolution 2D images with purpose shows the internal structures and properties of objects or study materials hence the importance of implementing a system of high precision sampling to optimize the work of obtaining images using Terahertz (THz) technology. The exactitude translation stage was built to move 3D objects by making two-dimensional paths of 1mm±1% with periods of programmable waiting time. The objective is to place the sample in reading position of each pixel, facing to propagation of the THz wave. For the operation was made to several programs capable of controlling the positioning, time and speed required in sampling.
A method for the recording of a rainbow hologram with multiple objects at different depths in a single exposition is presented. The created hologram can be observed under white incoherent light and shows three letters R, O, and X where the R is closest to the observer at surface level and the other two letters are placed at 2mm increments into the hologram. A spatial light modulator containing the information of a binary computer-generated hologram (CGH) of the three letters is illuminated with a 632.8nm HeNe laser. The reconstructed hologram is projected on a photosensitive film and interfered with a plane wave acting as a reference beam for 90s and then developed.
Study of wave propagation with random amplitude and phase, which overlap to form interference, is presented. Where each superimposed wave has independent random amplitude and phases that are monitored by the visibility parameter. This parameter is a function of the spatial correlation distribution of amplitudes and phases of the waves that emerge from the openings. The interference fringes visibility depends on the degree of phase randomness and to a lesser extent wave amplitude.
A theoretical study of gratings with radial symmetry and variable periods with sinusoidal profile, modulated for amplitude are shown. The behavior of the diffraction pattern and their symmetry degree of gratings were observed. Grating period can be modulated by external factor as spatial orientation effects per propagation, as inclination perspective of image projections that can produce local modified periods; this modulation kind causes changes in the diffracted pattern orders.
We present the performance characterization of photosensitive film emulsions prepared with saccharides like:
pectin, fructose and sugar (Glass ®), at certain physicochemical conditions for holographic recording. The
photo-oxidation was carried out with concentrations of iron ions, Fe+3. We analyzed the parameters of the
diffraction efficiencies of each grating constructed with saccharides film. The work was to achieve stability
and non-toxicity of the films prepared easily with water-Fe ions. We performed an experimental comparison
of the holographic films capacity between the three saccharides.
We study experimentally the capacity of a transmission in volume holograms, which have a phase and amplitude
modulation in a matrix of nitrocellulose. Which is photosensitized with ferric chloride salt FeCl3. They use different
sources of radiation to determine which wavelength is most efficiently achieved registration diffractive holographic
elements.
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