Journal ArticleDOI
Nonresonant third-order susceptibility measurements in the nematic liquid crystal K18
John Philip,T. A. Prasada Rao +1 more
TLDR
In this article, a large nonresonant third-order nonlinear susceptibility, X(3) (-ω; ω, 0, 0) was observed in the isotropic phase of a nematic liquid crystal 4′-n-hexyl-4-cyanobiphenyl (K18).Abstract:
We have observed a large nonresonant third-order nonlinear susceptibility, X(3) (-ω; ω, 0, 0) in the isotropic phase of a nematic liquid crystal 4′-n-hexyl-4-cyanobiphenyl (K18). The highest value of X(3) obtained at 632.8 nm is 1.16274×10-18 m2V-2 corresponding to a temperature 29.3°C. The observed second-order pretransitional temperature T* from our measurements is 1.2°C below the first-order nematic to isotropic transition temperature. The dependence of the Kerr constant on (T-T*)-1 is found to be in good agreement with the predictions of the Landau-de Gennes model.read more
Citations
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Journal ArticleDOI
Liquid-crystal photonic applications
TL;DR: In this article, the use of liquid crystals in different photonic components: optical filters and switches, beam-steering devices, spatial light modulators, integrated devices based on optical waveguiding, lasers, and optical nonlinear components are discussed.
Journal ArticleDOI
Electro-optical Kerr effect of two high birefringence nematic liquid crystals
TL;DR: In this article, a new tolane-base liquid crystal, 4'-heptyl-3-fluoro-4-isothiocyanatotolane (7TOLF), and a biphenyl-base nematogen, 7BF, have been investigated for the first time to determine their electro-optical behavior and third order non-linearity using the static Kerr effect method.
Journal ArticleDOI
Low-power phase conjugation in push–pull azobenzene compounds
TL;DR: Low-power phase conjugation of azobenzene-compound-doped poly(methyl methacrylate) films was studied and it was shown that this kind of polymer has appreciable third-order optical nonlinearity.
Journal ArticleDOI
Synthesis and characterisation of azomethine class thermotropic liquid crystals and their application in nonlinear optics
TL;DR: In this paper, azomethine derivatives were synthesized and their molecular structures were confirmed by nuclear magnetic resonance spectroscopy, Fourier transform infrared (FTI) and ultraviolet-visible spectrography.
References
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Continuous-wave self-focusing and self-trapping of light in artificial Kerr media
TL;DR: The independence of the critical power for self-trapping on the beam diameter in the unsaturated regime was confirmed for the first time to the authors' knowledge and values of the nonlinear coefficient were determined.
Journal ArticleDOI
Optical-Field-Induced Ordering in the Isotropic Phase of a Nematic Liquid Crystal
George K.L. Wong,Y. R. Shen +1 more
TL;DR: In this article, it was shown that molecular ordering in the isotropic phase of MBBA can be induced by an intense laser field and the ordering relaxation time as a function of temperature.
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Nonlinear Susceptibility Constants and Self-Focusing of Optical Beams in Liquids
Journal ArticleDOI
Laser-Induced Optical Kerr Effect and the Dynamics of Orientational Order in the Isotropic Phase of a Nematogen
J. Prost,J. R. Lalanne +1 more
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OPTICAL-FIELD-INDUCED REFRACTIVE INDICES and ORIENTATIONAL RELAXATION TIMES IN A HOMOLOGOUS SERIES OF ISOTROPIC NEMATIC SUBSTANCES
TL;DR: In this paper, the optical Kerr constant and the orientational relaxation times of seven p,p-di-nalkoxyazoxybenzene homologous compounds were measured as functions of temperature in the isotropic phase.
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