Birefringent properties

LCs are materials that undergo physical reorganization in which at least one of the rearranged structures involve molecular alignment along a preferred direction, causing the material to exhibit nonisotropic behavior and associated birefringent properties, i.e., molecular asymmetry. 

This chapter describes the synthesis of partially fluorinated polyimides for optical teleconununications applications," " 2 their optical transparency (optical loss), refractive index, and birefringence properties" in addition to their fundamental properties. It also describes their device application as optical interference filters," " optical waveplates," and optical waveguides." -" ... 

PMCS-6 diffraction patterns in the temperature range from Tg to 250 - 300°C displays a single nar-row reflex (1/2A = 20 ) of high intensity at 20 =0.5°, corresponded to the interchain distance. Opti-cal observations on a polarization microscope indicate that the polymers possess the birefringence property [32],... 

The response of most materials to mechanical, electrical, optical and other force fields is time-dependent. The study of the responses to these force fields allows one to determine, respectively, the rheological, dielectrical and birefringence properties of materials. According to the second law of thermodynamics, part of the input energy involved in the perturbation must invariably be dissipated, and part of it is stored. It should be pointed out... 

An alternative method for the realization of KLM uses the birefringent properties of the Kerr medium, which turns the plane of polarization of the light wave... 

An alternative method for the realization of KLM uses the birefringent properties of the Kerr medium, which turns the plane of polarization of the light wave passing through the Kerr medium. This is illustrated in Fig. 11.23. The incident wave passes through a linear polarizer and is then elliptically polarized by a A/4-plate. The Kerr medium causes a time dependent nonlinear polarization rotation. A A/2-plate and a linear polarizer behind the Ken-medium can be arranged in such a way that the pulse transmission reaches its maximum at the peak of the incident pulse, thus shortening the pulse width [11.55]. This device acts similarly to a passive saturable absorber and is particularly useful for fiber lasers with ultrashort pulses. 

Y. Arakawa, S. Nakajima, R. Ishige, M. Uchimura, S. Kang, G. Konishi, J. Watanabe, Synthesis of diphenyl-diacetylene-based nematic liquid crystals and their high birefringence properties, J. Mater. Chem. 22 (2012) 8394. 

At 90 days, the sutures were becoming translucent and had lost some of their birefringent properties. A few of the suture cross-sections stained pink (eosinophilic) around the periphery and the edges w ere indistinct, indicating the onset of absorption. The tissue reactions generally consisted of a fibrous capsule and a layer of macrophages interposed between it and the suture surface. 

The lack of symmetry operators are commonly manifested by the lack of X-ray diffraction peaks typically found in crystalline solid, but may exhibit a characteristic broad amorphous halo (Fig. 1.1). In addition, an amorphous solid is further characterized by the lack of distinct melting point and birefringence properties. 

Angiolini, L., Benelli,T., Giorgini, L., Salatelli, E., Bozio, R., Dauru, A. and Pedron, D. (2006) Improvement of photoinduced birefringence properties of optically active methacrylic polymers through copolymerization of monomers bearing azoaromatic moieties . Macromolecules, 39,489-497. 

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