Results 201 to 210 of about 8,745 (262)
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Birefringence measurement by speckle statistics
Applied Optics, 1985The statistical polarization properties of speckle patterns are used to develop a method for measuring birefringence inherent in a speckle producing process. A formula is derived for the mean value of the second Stokes parameter as a function of the birefringence and of the angular orientation of the linear retarder. Measurements have been successfully
P F, Steeger, T, Asakura
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Interferometric stress birefringence measurement
Applied Optics, 1992We describe a sensitive method for measuring the stress birefringence of an optical window that utilizes a phase-measuring Fizeau interferometer incorporating a variable retarder and a nonpolarizing beam splitter. When we test a material in an interferometer cavity, the wave front transmitted through the material is deviated by the surfaces ...
E R, Cochran, C, Ai
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Birefringence measurements of liquid crystals
Applied Optics, 1984A convenient and accurate technique for measuring the birefringence of liquid crystals at discrete wavelengths or as a continuous function of wavelength in the ultraviolet, visible, or infrared spectral regions is described. The method is based on determination of the phase differences which occur when monochromatic polarized light propagates through a
S T, Wu, U, Efron, L D, Hess
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Measurement of birefringence in ZnCdTe
Ferroelectrics, 1992Abstract Birefringence was observed for the first time in the ferroelectric phase of ZnCdTe samples containing 10% and 4% ZnTe. Near the transition temperature, the birefringence varied linearly with the temperature. The temperature coefficient of the indices of refraction was also measured and these also revealed the anisotropy of the ferroelectric ...
E. Fredj +3 more
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Measurement of Birefringence by the Method of Isoclinics
Journal of Rheology, 1987An explanation is presented for the isoclinic band-spreading patterns associated with the measurement of flow birefringence in a two-dimensional slit-flow geometry. Band spreading is attributed to the positional dependence of the shear stress in the vicinity of the side wall viewing windows leading to a range of positions along the channel depth at ...
Bamin Khomami, A J McHugh, M E Mackay
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Birefringence measurements in thiourea
Ferroelectrics, 1990Abstract Optical birefringence measurements have been performed on normal (hydrogenated) thiourea between 4 and 300 K. A tentative explanation of the results is given for the whole temperature range.
R. Farhi, F.-J. Schafer, W. Kleemann
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Flow birefringence of microtubules and its relation to birefringence measurements in cells
Cell Motility, 1985AbstractUnderstanding the molecular basis of mitotic movements in living cells will require correlative experiments on intact cells, cell models, purified tubulin, and perhaps other biopolymers. Birefringence is one assay that is useful in all of these experimental situations.
R, Hard, R D, Allen
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Measurement of the magnetic birefringence of neon gas
Journal of the Optical Society of America B, 1991We constructed a sensitive ellipsometer to study extremely small ellipticities that are acquired by laser light when it traverses a multipass optical cavity in a 9-m-long superconducting magnet. This setup was used to measure the Cotton–Mouton constant (CCM) of neon at 514.5 nm. We find for 760 Torr (1 atm) and 25°C that CCM(Ne) = (5.5 ± 0.3) × 10−20 G−
R. CAMERON +9 more
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Birefringence measurement of fiber-optic devices
Applied Optics, 1981A spectrometer-polarimeter is described for the measurement of the wavelength-dependent general birefringence of single-mode optical fibers and fiber-optic devices. The polarizer rotates, the analyzer is stepped, and a Fourier transform yields the principal axes and retardation. The Poincaré representation of polarization is used throughout.
Y, Yen, R, Ulrich
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Birefringence measurement by the self-compensation method
Applied Optics, 1992A self-compensation method for measuring the birefringence of an optical material is proposed; an accuracy of ~10−6 is obtained. Only a thin sample is needed in this method.
L, Yi, Z, Yi, S, Xiyu, S, Lianke
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