Topic
Organic photorefractive materials
About: Organic photorefractive materials is a research topic. Over the lifetime, 697 publications have been published within this topic receiving 13041 citations.
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01 Jan 2000
TL;DR: In this article, a new and unexpected form of orientational photorefractivity was discovered; consequently high dynamic range was obtained with low power semiconductor laser diodes; and the polymers were successfully used in different applications, including holographic storage.
Abstract: While photorefractivity during the 1970s and 1980s was studied in many different classes of inorganic materials [1], organic photorefractive (PR) materials emerged only in the 1990s. The quest for organic photorefractive materials was driven by their electronic optical nonlinearity, which leads to materials that combine high electro-optic coefficient and low dielectric constant, a property that improves the figure of merit for photorefractivity Q = n 3 r/e, where n is the refractive index, r is the electro-optic (or Pockels) coefficient, and e is the low-frequency dielectric constant. During recent years, this new field of research experienced several milestones: a new and unexpected form of orientational photorefractivity was discovered; consequently high dynamic range was obtained with low-power semiconductor laser diodes; and the polymers were successfully used in different applications, including holographic storage. With their plasticity and other unique properties, they constitute a strategic class of materials because they enable the mass production at low cost of new devices with low weight, and high performance. Thus such materials are expected to have a significant impact on dynamic holographic technologies.
11 citations
TL;DR: In this paper, a planar photorefractive waveguide was fabricated by laser irradiation with the wavelength of 632.8 nm and 532 nm, respectively, in a KNSBN:Ce crystal, where the high refractive index regions induced by thin cylindrical or thin sheet beams propagating through the crystal were used as waveguide structures.
11 citations
Patent•
08 Dec 1987
TL;DR: In this paper, an optical bistable photorefractive crystal device is provided in which a photore-fractive glass disposed between two mirrors is uniformly illuminated by a light beam, a signal beam being focused on a given portion of the crystal to cause bistability switching of this portion inside the crystal.
Abstract: An optical bistable photorefractive crystal device is provided in which a photorefractive crystal disposed between two mirrors is uniformly illuminated by a light beam, a signal beam being focused on a given portion of the crystal to cause bistable switching of this portion inside the crystal.
11 citations
TL;DR: In this article, a degenerate four-wave mixing experiment enabled measurements of phase conjugate reflectance as a function of input beam intensities, applied electric field, and grating spacing.
Abstract: Optical phase conjugation in a high-performance photorefractive polymer-dissolved liquid crystal composite has been observed with a cw frequency-doubled Nd-YAG laser (532 nm) or He–Ne laser (633 nm). The degenerate four-wave mixing experiment enabled measurements of phase conjugate reflectance as a function of input beam intensities, applied electric field, and grating spacing. The refractive index modulation was estimated from the phase conjugate reflectance on the basis of the coupled wave theory including the absorption loss of the photorefractive media. Small input powers were sufficient for inducing a large refractive index modulation around 4.0 ×10-3.
11 citations
TL;DR: In this paper, photorefractive BaTiO3:Ru single crystals were fabricated and investigated, and the authors found that the dark conductivity is dominant in the crystal and much higher than the photo conductivity at a low intensity pumping beam.
11 citations