Results 251 to 260 of about 35,975 (303)
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Nature, 1950
IT has been known for some time that the cell membrane of an amœba in water is birefringent. The optical axis lies radially, and the sign is positive with respect to the tangent1 (Fig. 1). I have found that if an Amœba proteus is fixed for about 10 min.
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IT has been known for some time that the cell membrane of an amœba in water is birefringent. The optical axis lies radially, and the sign is positive with respect to the tangent1 (Fig. 1). I have found that if an Amœba proteus is fixed for about 10 min.
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Optometry and Vision Science, 1975
ABSTRACT In recent years it has become common for the birefringence pattern of a thermally toughened glass lens to be examined, and for a judgmental opinion of the impact resistance of that lens to be based on the regularity of the observed pattern Laboratory experiments were carried out to determine the validity of this practice.
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ABSTRACT In recent years it has become common for the birefringence pattern of a thermally toughened glass lens to be examined, and for a judgmental opinion of the impact resistance of that lens to be based on the regularity of the observed pattern Laboratory experiments were carried out to determine the validity of this practice.
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Wavelength dependence of birefringence in highly birefringent fibers
Optics Letters, 1982A simple technique is used to measure the wavelength dependence of the birefringence in highly birefringent fibers. In stress-induced fibers, the stress and shape birefringences reinforce each other, whereas in elliptical-core fibers the stress and shape birefringences can either reinforce each other or partially cancel, depending on the wavelength.
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Optics Letters, 1992
A study of photoinduced birefringence in bow-tie (stress-induced) high-birefringence (Hi-Bi) and low-birefringence (Lo-Bi) germanosilicate optical fibers is conducted by using 532-nm light. The study reveals that Hi-Bi fibers are insensitive to light polarized along the fast axis, in contrast to Lo-Bi fibers, which are photosensitive along both axes ...
S, Bardal, A, Kamal, P S, Russell
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A study of photoinduced birefringence in bow-tie (stress-induced) high-birefringence (Hi-Bi) and low-birefringence (Lo-Bi) germanosilicate optical fibers is conducted by using 532-nm light. The study reveals that Hi-Bi fibers are insensitive to light polarized along the fast axis, in contrast to Lo-Bi fibers, which are photosensitive along both axes ...
S, Bardal, A, Kamal, P S, Russell
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The Spectral Dispersion of Birefringence, Especially of Birefringent Plastic Sheets
Journal of the Optical Society of America, 1949It is shown apparently for the first time how dispersion of birefringence (retardation, phase difference or ellipticity) can be measured through the visible spectrum by the use of a Martens type of polarization photometer and monochromator. Dispersion curves are given for several organic thermoplastic sheets including those with both normal and ...
C D, WEST, A S, MAKAS
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Improvements in birefringent filters 6: Analog birefringent elements
Applied Optics, 1980A 100-mA analog birefringent element has been built from a polarizing wide field solid Michelson interferometer. The analog element behaves on-axis identically to a crystal element but has the field characteristics of a wide field Michelson. It is demonstrated that by proper choice of glasses for the arms of the Michelson the wide field condition can ...
A M, Title, H E, Ramsey
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Holodiagrams in birefringent media
Applied Optics, 2003The modifications to the holodiagram concept to describe free propagation (the extraordinary ray) inside birefringent materials are described. Holodiagrams are graphs showing the loci where the sum or the difference in the optical path from a generic point to two foci is the same.
Héctor, Rabal +3 more
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Birefringence and dichroism of photoreceptors
Vision Research, 1976Abstract Equations are derived for the refractive indices, birefringence, absorption coefficients and dichroic ratios, of photoreceptors of the vertebrate type composed of a stack of discs and the common invertebrate type of parallel microvilli. The results are plotted graphically, and approximate expressions are given for quick calculations.
J N, Israelachvili +2 more
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Birefringent imaging spectrometer
Applied Optics, 2002A Fourier-transform imaging spectrometer, believed to be novel, based on the Savart polariscope is presented. There is no slit in this instrument, which means that it has a high throughput. The principle and the system configuration are described. Several preliminary experimental results are shown.
Gao, Zhan +3 more
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