Results 251 to 260 of about 20,871 (297)

High Birefringent Liquid Crystals

Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1995
Abstract Several liquid crystal dyes and fluorinated compounds with high birefringence are synthesized and their properties evaluated. These polar compounds are useful dopants for enhancing the dielectric anisotropy of the dialkyl diphenyl-diacetylene host.
Shin-Tson Wu, J. D. Margerum, M. S. Ho, B. M. Fung, C. S. Hsu, S. M. Chen, K. T. Tsai   +6 more
openaire   +1 more source

Embedded multicore hollow fiber with high birefringence

Applied Optics, 2011
We fabricate and demonstrate a hollow fiber with multiple embedded cores (MCHF) based on a modified "suspended core-in-tube" preform technique. Its birefringence properties are controlled by the MCHF core's ovality, which could be controlled by the applied pressure and drawing temperature in the MCHF preform.
Fengjun, Tian, Libo, Yuan, Qiang, Dai, Zhihai, Liu   +3 more
openaire   +2 more sources

The dynamic birefringence of high polymers

Journal of Polymer Science Part B: Polymer Physics, 1962
AbstractThe simultaneous measurement of the birefringence and strain of a sample subjected to sinusoidal strain is proposed as a means for elucidating the molecular mechanism of the response of high polymers to mechanical deformation. A linear phenomenological theory is proposed in which strain‐optical coefficient distribution functions are assigned to
Richard S. Stein, Shigeharu Onogi, Daniel A. Keedy   +2 more
openaire   +1 more source

Development of low- and high-birefringence optical fibers

IEEE Journal of Quantum Electronics, 1982
The polarization properties of single-mode optical fibers are easily modified by environmental factors. While this can be exploited in a number of fiber sensor devices, it can be troublesome in applications where a stable output polarization-state is required.
Payne, D.N., Barlow, A.J., Ramskov Hansen, J.J.   +2 more
openaire   +2 more sources

Measurement of polarization mode dispersion in high-birefringence fibers

Optics Letters, 1983
A broadband superluminescent diode at 0.84 microm is used to measure the group-delay difference in four high-birefringence single-mode fibers. Measured values range from 0.6-0.9 nsec/km for the stress-induced birefringence fibers to 3.6 nsec/km for the elliptical-core fiber.
W K, Burns, R P, Moeller
openaire   +2 more sources

Liquid crystalline materials with high birefringence

Journal of Optical Technology, 2005
The mesogenic, optical, and dielectric properties of the new mixtures of high-birefringence nematic liquid crystals based on isothiocyanatotolanes are investigated, and examples of multicomponent mixtures with low viscosity and optical anisotropy Delta n approximately 0.4 are presented.
A. Spadlo, R. Dabrowski, J. Dziaduszek, E. Scibior, S. Urban, S. Gauza, S. T. Wu   +6 more
openaire   +2 more sources

An analysis of high birefringence fibers

Journal of Lightwave Technology, 1987
A fiber is birefringent if it has a non-circular core and/or cladding, or is subjected to anisotropic stress. As a result of anisotropic stress, the fibers become biaxial. In this work, a theoretical study on the fields and dispersion of polarization modes in biaxial fibers is presented. The analysis is based on a perturbation method.
openaire   +1 more source

High birefringent fibers for stress detection

SPIE Proceedings, 2003
Initial results of study a lateral stress, static and dynamic, on a light propagation in a high birefringent fiber are presented. A permanent birefringence in optical fiber arises due to large thermal stress in the core. Ambient parameters like temperature and hydrostatic pressure influence the stress anisotropy and thus the light propagation.
Marcin Roszko, Andrzej W. Domanski, Tomasz R. Wolinski, Marek W. Sierakowski, Piotr Lesiak   +4 more
openaire   +1 more source

Dynamic birefringence of several high polymers

Journal of Polymer Science Part C: Polymer Symposia, 1964
AbstractThe complex strain‐optical coefficient, complex stress‐optical coefficient, complex modulus of elasticity and the corresponding loss tangent of phase angles between the stress, strain and birefringence have been measured for several high polymers in the frequency range from 0.001 to 10 cycles/sec.
R. Yamada, C. Hayashi, S. Onogi, M. Horio   +3 more
openaire   +1 more source

High birefringence liquid crystalline materials

2008 IEEE/LEOS Winter Topical Meeting Series, 2008
In this paper, nematic liquid crystalline materials and its mesogenic and physicochemical properties (mainly birefringence, dielectric anisotropy, and viscosity) will be discussed. The influence of number and position of fluorosubstitution on the ability of nematic phase formation in broad temperature range and on the value and sign of dielectric ...
R. Dabrowski, S. Gauza, J. Dziaduszek, P. Kula, S. Urban, S. T. Wu   +5 more
openaire   +2 more sources