Publications by authors named "G Petriashvili"

The review presents new ideas about developmental mechanisms of amblyopia, which are currently discussed in literature. Objective evidence has accumulated that amblyopia affects both monocular and binocular functions in visual processing. Given the increasing evidence of fundamental and clinical research, it is most likely that binocular dysfunction is primary, and monocular reduction is visual acuity is secondary to this disease.

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Article Synopsis
  • Strong conical lasing in the violet-blue spectrum is achieved using dye doped cholesteric liquid crystals.
  • The efficiency of cone laser emission is significantly enhanced at specific luminescence peak points of the dyes.
  • The process allows for low pump density and does not require intense focusing of the pumping beam, enabling clear observation of cone lasing without other laser emissions.
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The aim of the work was to determine the possibility of assessing the state of human health by the method of optical spectroscopy of skin and nail. To achieve this goal, Laser-Induced Fluorescence (LIF) spectroscopy was used. A special probe was designed, which makes it possible to record differential spectra and, as a result, to compare the shapes of spectral fluorescence lines.

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We have developed a cholesteric liquid crystal (CLC) mirror-based innovative model for detection and visualization of images in turbid media. Due to its unique optical-polarization properties, the CLC mirror is suggested as the basic element of the imaging Stokes polarimeter. The particular design of the proposed polarimeter, coupled with its distinguished operational simplicity, reliability, and real-time operational facilities, promises to fabricate a new generation of the imaging Stokes polarimeter, which can find applications in areas such as diagnostics, biology, astronomy, and remote sensing.

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Using a surface force apparatus, a cholesteric liquid crystal was confined between two crossed cylindrical surfaces that induced strong planar anchoring and normal alignment of the chiral helix. The film thickness and total twist angle of the chiral molecular structure were simultaneously measured using multiple-beam optical interference. As the film thickness was increased and the chiral structure deformed, the twist angle remained almost unchanged until discontinuous changes occurred at critical distances that were equally spaced by one cholesteric half-pitch length.

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