Nonresonant third‐order optical response of polyphenyl acetylene
15 Mar 1991-Journal of Applied Physics (American Institute of Physics)-Vol. 69, Iss: 6, pp 3429-3431
TL;DR: Optical phase conjugation by degenerate four-wave mixing in samples of pristine and iodine-doped polyphenylacetylene at ruby laser wavelength (694.3 nm) is reported in this paper.
Abstract: Optical phase conjugation by degenerate four‐wave mixing in samples of pristine and iodine‐doped polyphenylacetylene at ruby laser wavelength (694.3 nm) is reported here. The nonresonant values of the third‐order optical susceptibility χ(3) are determined from the measurements of reflectivity of phase conjugate signals.
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TL;DR: The second and third order non-linear optical susceptibilities of several donoracceptor substituted side chain polymers, some of which exhibit mesophases, were measured by harmonic generation from thin films, typically 0·5 μm thick, at a fundamental wavelength of 1064 nm and 1579 nm.
Abstract: The second and third order non-linear optical susceptibilities of several donoracceptor substituted side chain polymers, some of which exhibit mesophases, will be reported. The susceptibilities were measured by harmonic generation from thin films, typically 0·5 μm thick, at a fundamental wavelength of 1064 nm and 1579 nm. For second harmonic generation, the spin coated films were contact poled on a glass substrate with an interdigited electrode pattern. Typical values obtained were χ(2) 31 = 1 × 10−9 esu and χ(2) 33 = 3 × 10−9 esu, the largest value was χ(2) 33 = 6·3 × 10−9 esu. The difficulty in deriving reliable second order structure-property relations because of the large effect which the contact poling process has on the non-linear optical susceptibility of the films will be highlighted. The highest χ(3) value of 5·8 × 10−12 esu obtained from an amorphous film of a polymer with an asymmetrically substituted azo side group is comparable with the susceptibility of more typical third order non-...
18 citations
TL;DR: In this paper, the third-order harmonic generation (THG) and electroabsorption (EA) in substituted polyphenylacetylenes (PPAs) have been studied.
Abstract: Third-order harmonic generation (THG) and electroabsorption (EA) in substituted polyphenylacetylenes (PPAs) which are examples of onedimensional π-conjugated polymeric systems have been studied. The values of x (3)(-3ω;ω,ω,ω) obtained from THG measurement for substituted PPAs increase with increasing λmax of absorption. The dispersion of x (3) (-ω;ω,0,0) for PPA film derived from Kramers-Kronig transformation of optical absorption change under the electric field (EA spectra) has been observed, and it shows the similar shape of the second derivative of the optical absorption spectra. The typical value of x (3)(-ω;ω,0,0) for o-substituted PPA was determined to be ca. 10−11 esu.
14 citations
TL;DR: In this article, the contribution of factors such as the backbone, conformation of the chain, sidegroups and polymerization catalyst on the optical nonlinearities of polyphenylacetylene chains was investigated.
Abstract: Conjugated polymers with sidegroups such as methyl, trimethylsilyl, p-methoxy phenyl, o-methoxy phenyl, and hexyl groups on a polyphenylacetylene chain are studied in an attempt to understand the contribution of factors such as the backbone, conformation of the chain, sidegroups and polymerization catalyst on the optical nonlinearities. The results of degenerate four-wave mixing experiments at 532 nm with nanosecond pulses indicate that the substitution of an electron-donating group away from the backbone can enhance the third-order susceptibility. Some of the polymers show optical limiting action at this wavelength. The thermal contribution to the measured susceptibility is also determined.
7 citations
TL;DR: In this paper, a multiplex CARS scheme was used to study the bulk polymers poly-(methyl methacrylate) (PMMA) and poly-(vinyl toluene) (PVT).
Abstract: A multiplex CARS scheme is used to study the bulk polymers poly-(methyl methacrylate) (PMMA) and poly-(vinyl toluene) (PVT). A coherent signal resulting from optical four-wave mixing is obtained with electronic and Raman-resonant parts. The magnitude of the third-order optical susceptibility tensor of these polymers is experimentally estimated. Significant enhancement of the total susceptibility by the Raman resonances is observed for PVT.
4 citations
TL;DR: Optical phase conjugation via degenerate four-wave mixing is studied in iodine solutions under pulsed laser radiation at two wavelengths (532 nm and 694 nm).
Abstract: Optical phase conjugation via degenerate four-wave mixing is studied in iodine solutions under pulsed laser radiation at two wavelengths (532 nm and 694 nm). The effect of using four different solvents (1,2-dibromoethane, xylene, methanol and ethanol) is studied at 532 nm. Phase conjugate reflectivities in the range of 0·1% to 0·3% are observed. The solutions exhibit a maximum reflectivity at an optimum concentration. The experimental data is analysed using the Caro-Gower model.
2 citations
References
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29 Sep 1983
762 citations
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12 Jul 1983
TL;DR: A process that involves the use of nonlinear optical effects to precisely reverse the direction of the motion of an object is described in this paper, where the optical effects are used to reverse the orientation of the object.
Abstract: A process that involves the use of nonlinear optical effects to precisely reverse the direction of p…
724 citations
01 Jan 1988
TL;DR: Theoretical and experimental results of second-order nonlinear optical properties of poly(p-Phenylene Vinylene)-Holes,Electrons,Polarons, and Bibpolarons and the Thermodynamics of electrically active Dopants in Conduting Polymers are discussed in this article.
Abstract: Nonlinear Optical and Electroactive Polymers: An Overview- Nonlinear Optical Polymers- Microscopic Origin of Second Order Nonlinear Optical Properties of Organic Structures- Design, Ultrastructure, and Dynamics of Nonlinear Optical Effects in Polymeric Thin Films- New Nonlinear Organic Crystals for Ultrafast Infra-Red Optical Processing- Electric-Field Poling of Nonlinear Optical Polymers- Frequency and Temperature Variations of Cubic Susceptibility in Polydiacetylesnes- Femtosecond Studies of Dephasing and Conjugation with Incoherent Light- Studies of Monomer and Polymer Monolayers Using Optical Second and Third Harmonic Generation- Development of Polymer Nonlinear Optical Materials- Orientationally Ordered Electro-Optic Materials- Conformation Transition in Polydiacetylene Solution- Molecular Engineering Approaches to Molecular and Macromolecular Nonlinear Optical Materials: Recent Theoretical and Exprimental Result- Poled Copoly(Vinylidene Flouride-Triflouroethylene) As A Host for Guest Nonlinear Optical Molecules- Electroactive Polymers- Electroactive Polymers:Consequences of Electron Delocalization- Optical Properties of Poly(p-Phenylene Vinylene)- Holes,Electrons,Polarons, and Bibpolarons and the Thermodynamics of electrically Active Dopants in Conduting Polymers- Transient Current Spectroscopy in Polymeric Films- Electrochemistry of Polyaniline:Consderation of a Dimer Model- Theory- A PPP Variational-Perturbation Calculating of Hyperplarizabilities of Conjudated Chains- Optical Spectra of Flexible Conjugated Polymers- Excitation in Conjugated Polymers- Synthesis- Towards New Electronic Structures in Crytallographically Ordered Conjugated Polymers- Side Chain Liquid Crystalline Copolymers for NLO Response- Synthesis of Certain Specific Electroactive Polymers- Rigid Aromatic Heterocyclic Polymers:Synthesis of Ploymers and Oligomers Containing Benzazole Units for Electrooptic Application- Devices- Nonlinear and Electro-Optic Organic Devices- Nonlinear and Optical processes in Optical Fibers- Nonlinear Optical Processes and Application in the Infrared with Nematic Liquid Crystals
372 citations
TL;DR: In this article, the π-electron contribution to linear and non-linear polarizabilities of conjugated chains was investigated and the respective influence of chain length and bond alternation on optical nonlinearities were analyzed.
268 citations