Design and Synthesis of Novel Second Order Nonlinear Optical Materials
Author : Rima Ghosn
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Page : 116 pages
File Size : 29,1 MB
Release : 1996
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Author : Rima Ghosn
Publisher :
Page : 116 pages
File Size : 29,1 MB
Release : 1996
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Author : Rima Ghosn
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Page : 336 pages
File Size : 11,64 MB
Release : 1997
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Page : 26 pages
File Size : 20,62 MB
Release : 1996
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The research accomplished in this project consists of four tasks each dealing with a different class of nonlinear optical (NLO) materials. Task (I): Second-order nonlinear optical materials. We developed new chromophores and processing to produce electro-optic materials with enhanced optical transparency towards the visible (>=700 nm), increased chemical and thermal stability and stability of poled alignment for 1000 hours at 100 deg C. Several approaches showed promises and we accomplished a great deal. Also, we developed polyurethane cross-linking polymers to produce thermally stable poling alignment in both molecular-ionic type and neutral type second-order chromophores. In both cases stability up to 1000 hours at 100 deg C was achieved. In another approach, in collaboration with Professor Shea of University of California, Irvine, we have employed ormosils to produce stable poled alignments. Task (II): Third-order nonlinear optical materials. We synthesized a group of phosphoylides containing a polarizable P atom and investigated their X(3) behavior via femtosecond Kerr gate measurements. By using optically heterodyned and phase-tuned Kerr gate techniques, we obtained both the signs and the magnitudes of the real and the imaginary components of X(3).
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Page : pages
File Size : 39,40 MB
Release : 195?
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Author : Stuart David Whittaker
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Page : pages
File Size : 32,14 MB
Release : 2003
Category : Hückel molecular orbitals
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Page : pages
File Size : 40,69 MB
Release : 2006
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Design and synthesis of a family of calix[4]arene-based nonlinear optical (NLO) chromophores are discussed. The calixarene chromophores are macrocyclic compounds consisting These molecules were synthesized such of four simple D-[pi]-A units bridged by methylene groups. These molecules were synthesized such that four D-n-A units of the calix[4]arene were aligned along the same direction with the calixarene in a cone conformation. These nonlinear optical super-chromophores were subsequently fabricated into covalently bound self-assembled monolayers on the surfaces of fused silica and silicon. Spectroscopic second harmonic generation (SHG) measurements were carried out to determine the absolute value of the dominant element of the nonlinear susceptibility, [Chi][sub zzz], and the average molecular alignment, [Psi]. We find a value of [Chi][sub zzz][approximately] 1.5 [times] 10[sup [minus]7] esu (60 pm/V) at a wavelength of 890 nm, and [Psi] [approximately] 36[degrees] with respect to the surface normal.
Author : Jerome V. Moloney
Publisher : Springer Science & Business Media
Page : 270 pages
File Size : 30,59 MB
Release : 1998-08-13
Category : Business & Economics
ISBN : 9780387985817
Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Author : Geoffrey A. Lindsay
Publisher :
Page : 564 pages
File Size : 45,82 MB
Release : 1995
Category : Language Arts & Disciplines
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Presents the most recent developments in second-order nonlinear optical polymers. Covers the most important technologies necessary to achieve commercially viable devices based on special polymeric materials with second-order nonlinear optical properties. Discusses important molecular design considerations, how to process the polymers into films, the stability of the films, their optical properties, and prototype devices that can be made from these films.
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Page : 22 pages
File Size : 36,73 MB
Release : 1995
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There has been a tremendous recent interest in the development of second-order nonlinear optical (NLO) polymeric materials for photonic applications. However, a major drawback of second-order NLO polymers that prevents them from being used in device applications is the instability of their electric field induced dipolar alignment. The randomization of the dipole orientation leads to the decay of second-order optical nonlinearities. Numerous efforts have been made to increase the stability of the second-order NLO properties of polymers. The search for new approaches to develop NLO polymers with optimal properties has been an active research area since the past decade. A novel approach, combining the hybrid properties of high glass transition temperatures, extensively crosslinked networks, and permanent entanglements, based on interpenetrating polymer networks (IPN) is introduced to develop stable second-order NLO materials. Two types of IPN systems are prepared and their properties are investigated. The designing criteria and the rationale for the selection of polymers are discussed. The IPN samples show excellent temporal stability at elevated temperatures. Long term stability of the optical nonlinearity at 100 C has been observed in these materials. Temporal stability of the NLO properties of these IPNs is synergistically enhanced. Relaxation behavior of the optical nonlinearity of an IPN system has been studied and compared with that of a typical guest/host system. The improved temporal stability of the second-order NLO properties of this IPN system is a result of the combination of the high rigidity of the polymer backbones, crosslinked matrices, and permanent entanglements of the polymer networks. A slight modification of the chemical structure resulted in an improvement of the optical quality of the sample.
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Page : 548 pages
File Size : 30,69 MB
Release : 1995
Category : Aeronautics
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