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  1. No Access

    Article

    Nonlinear Fiber Core Liquid and Nematic Liquid Crystal Film for Wide Temporal Bandwidth Optical Limiting Application

    Nonlinear absorption processes in an extremely nonlinear optical fiber core liquid, and recently observed supra-optical-nonlinearity in dopant modified nematic liquid crystals, are discussed in the context of ...

    I. C. Khoo in MRS Online Proceedings Library (1999)

  2. No Access

    Chapter

    Photorefractivity and Optical Wave Mixing Effects in Nematic Liquid Crystals Doped with Fullerene Derivatives and Dyes

    The photorefractive effect has been observed and documented for decades1,2. This effect is typically observed in impurity doped electrooptic crystals. When the crystal is illuminated, charge carriers are excited ...

    Brett D. Guenther, M. V. Wood, I. C. Khoo in Science and Technology of Polymers and Adv… (1998)

  3. No Access

    Article

    Liquid Crystals for Fast Infrared Laser Switching and Optical Limiting Application

    We present the results of several experimental studies of infrared[IR] nonlinear optical responses of aligned nematic liquid crystals, including laser induced molecular reorientation, density-, thermal- and or...

    I. C. Khoo, M. V. Wood, Brett D. Guenther in MRS Online Proceedings Library (1997)

  4. No Access

    Article

    Nonlinear Optical Fiber Core Materials For Optical Limiting Application

    Several liquid phase liquid crystals and liquids are found to possess broadband nonlinear absorption characteristics suitable for optical limiting applications. Using these liquids as fiber waveguiding cores, ...

    I. C. Khoo, M. V. Wood, Brett. D. Guenther in MRS Online Proceedings Library (1997)

  5. No Access

    Article

    Photorefractivity and Holographic Storage Effect in Fullerene C60-Doped Nematic Liquid Crystals

    The results of a recent study of a nonlinear electro-optical effect in fullerene C6o-doped nematic liquid crystal film are presented. In particular, photo-induced conduction, self diffraction effect, and permanen...

    I. C. Khoo, M. V. Wood, Brett D. Guenther in MRS Online Proceedings Library (1996)

  6. No Access

    Chapter

    Nonlinear Electro-Optical and Holographic Storage Effect in Fullerene-Doped Nematic Liquid Crystal Film

    There have been intense research interests in materials capable of recording holographic planar or volume gratings. These include inorganic [1] and polymeric [2] photorefractive crystals, liquid crystals [3–5]...

    I. C. Khoo in Polymers and Other Advanced Materials (1995)

  7. No Access

    Article

    Nonlinear optical propagation and self-limiting effect in liquid-crystalline fibers

    The nonlinear optical properties of the isotropic phase of liquid crystals induced by nanosecond laser pulses are analyzed in the context of nonlinear multi-mode propagation in a liquid-crystal-cored fiber. Th...

    I. C. Khoo, H. Li in Applied Physics B (1994)

  8. No Access

    Article

    Optical Limiting with Liquid Crystalline Cylindrical Guided Wave Optical Elements

    Using micro-capillaries and capillary arrays, we have fabricated dye- and C60-doped liquid crystal cored fibers and image transmission plates of various core diameters and lengths. We have observed nonlinear puls...

    I. C. Khoo, H. Li, Ming Lee, B. K. Yarnell, M. V. Wood in MRS Online Proceedings Library (1994)

  9. No Access

    Chapter

    Liquid Crystal Nonlinear Optics

    Liquid crystals occupy a very important and unique place in current research and development efforts in various display and electro-optical devices. Research conducted in the last decade has also shown that th...

    I. C. Khoo in Frontiers of Polymers and Advanced Materials (1994)

  10. No Access

    Chapter

    Nonlocal radial dependence of laser-induced molecular reorientation in a nematic liquid crystal: theory and experiment

    We present a detailed theoretical calculation, with experimental verification, of the nonlocal molecular reorientation of the nematic-liquid-crystal director axis induced by a cw Gaussian laser beam. The natur...

    I. C. Khoo, T. H. Liu, P. Y. Yan in Opticals Effects in Liquid Crystals (1991)

  11. No Access

    Chapter

    Nonlinear Optical Processes and Applications in the Infrared with Nematic Liquid Crystals

    Nematic liquid crystal films possess several unique characteristics for applications in optical wave mixings and beam amplifications in the infrared spectral region. We present new theoretical understandings o...

    I. C. Khoo in Nonlinear Optical and Electroactive Polymers (1988)

  12. No Access

    Chapter and Conference Paper

    Fluorescence Spectrum from a Three-Level Atom Interacting with a Monochromatic and Broadband Laser

    The fluorescence spectrum emitted from a three-level atom interacting with two strong resonant fields has received considerable attention. The three-level atom in the ladder-type configuration has been studied...

    R. Postiff, I. C. Khoo, P. K. Kuo, L. D. Favro in Coherence and Quantum Optics V (1984)

  13. No Access

    Chapter and Conference Paper

    Theory of Quantum Beats and Emission Dynamics from Molecules

    The theory and experimental study of molecular emission is of fundamental and applied significance. New interesting problems arise as more state-of-the-art technique for producing molecules in well isolated st...

    I. C. Khoo, S. L. Wang, E. C. Lim in Coherence and Quantum Optics V (1984)