Results 171 to 180 of about 5,145,048 (246)
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Modal dispersion in multimode graded-index fibers
Applied Optics, 1975A complete analysis of the propagation characteristics of a ray through an axially symmetric graded-index medium is carried out in the geometrical optics approximation. First, two constants of the motion are shown to exist for a ray propagating in an infinite medium.
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Refractive index of concentrated colloidal dispersions
Journal of the Chemical Society, Faraday Transactions 2, 1981This paper describes the measurement and theoretical interpretation of the refractive index, n′, of a range of disordered aqueous colloidal dispersions. Concentrations up to 50% by volume and particle sizes in the range 0.1–1.5 µm were used. All dispersions were highly turbid and required special refractometric methods.
Keith Alexander +3 more
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Dispersion in step-index silicone-clad fibers
Applied Optics, 1979Optical properties of materials making up multimode step-index fibers with inorganic glass cores and silicone cladding have been examined using bulk sample measurement techniques. Mode dispersion and numerical aperture for the wavelength range 0.4-1.4 microm for two fibers are reported.
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Dispersion of the nonlinear refractive index in sapphire
Optics Letters, 2004The nonlinear refractive index, n2, of sapphire was experimentally measured in the 550-1550-nm wavelength range by use of a picosecond Z-scan technique. It was found that in this spectral region the value of n2 decreases monotonically from approximately 3.3 x 10(-16) to approximately 2.8 x 10(-16) cm2/W.
Arkady, Major +4 more
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Refractive Index and Dispersion
2014The ISO 9802 Raw Optical Glass–Vocabulary and ISO 12123 Specification of Raw Optical Glass define refractive index as follows: “Ratio of the velocity of the electromagnetic waves at a specific wavelength in a vacuum to the velocity of the waves in the medium.” Dispersion denotes the effect that refractive index changes with wavelength.
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Dispersion Inversion in High Index Contrast AlGaAs-Nanowires
2007 Conference on Lasers and Electro-Optics (CLEO), 2007We present numerical simulations of the temporal dispersion in high contrast AlGaAs nanowires and predict the inversion of the group velocity dispersion for sub-micron sized wires.
J. Meier, M. Mojahedi, J. S. Aitchison
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1984
The index of dispersion is a statistic commonly used to detect departures from randomness of count data. Under the hypothesis of randomness, the true distribution of this statistic is unknown. The accuracy of large sample approximations is assessed by a Monte Carlo simulation.
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The index of dispersion is a statistic commonly used to detect departures from randomness of count data. Under the hypothesis of randomness, the true distribution of this statistic is unknown. The accuracy of large sample approximations is assessed by a Monte Carlo simulation.
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Reverse dispersion fiber with depressed core-index profile for dispersion-managed fiber pairs
Optics Communications, 2005Abstract A reverse dispersion fiber (RDF) with depressed core-index profile has been developed successfully by using plasma chemical vapor deposition (PCVD) process. The fabricated RDF has a core-effective-area of 45 μm 2 , a dispersion of −19.65 ps/nm/km and a dispersion slope of −0.132 ps/nm 2 /km while maintaining the low bending induced ...
Xiaoqiang Jiang, Ruichun Wang
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Refractive index dispersions of liquid crystals
Optical Engineering, 1993Refractive indices of two nematic liquid crystals, 5CB and 5PCH, were measured from the 400- to 800-nm region at various temperatures. Results fit the three-band model well. Through comparisons, the contributions of σ and π electrons to the refractive indices and birefringence of uniaxial liquid crystals are evaluated quantitatively.
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Zero dispersion in step index slab waveguides
Journal of Lightwave Technology, 1999Specific features of the dispersion in step index slab waveguides, such as zero waveguide dispersion and zero group delay difference between modes, are shown to be described by normalized expressions involving two normalized structure parameters only.
G. Pandraud, O. Parriaux
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