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Glass Material Specifications
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From Edmund Optics Inc.
Selecting a glass material is important since different glass types have different characteristics. Edmund Optics offers a wide variety of glass types which can be selected on the basis of the following characteristics. The index of refraction and Abbe number of a glass are typically used by designers as degrees of freedom when designing systems. The index of refraction refers to the ratio of the speed of light in a vacuum to the speed of light through a given material at a given wavelength, while the Abbe number of a material quantifies the amount of dispersion (variations in index) for a specific spectral range. For instance, a higher index of refraction generally bends light more efficiently so there is less of a need of curvature in the lens. Spherical aberration is less present in lenses with higher indices of refraction, while light travels faster through materials with lower indices of refraction. A high Abbe number generally gives less color dispersion and reduces color aberration. Also, certain glass types have different transmission wavelength regions. Products & Services
Fresnel lenses resemble a planoconvex or planoconcave lens that is cut into narrow rings and flattened. If the steps are narrow, the surface of each step is generally made conical and not spherical.
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Spherical lenses, also known as singlets, are transparent optical components consisting of one or more pieces of optical glass with surfaces so curved that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object. This area includes micro spherical lenses as well.
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Optical lenses are transparent components made from optical-quality materials and curved to converge or diverge transmitted rays from an object. These rays then form a real or virtual image of the object. This area includes micro lenses.
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A diffraction grating uses a substrate with parallel grooves to disperse light into its spectra. Eschelles are included in this area.
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Learn more about Diffraction Gratings
Optical polarizers are optical devices that can transform unpolarized or natural light into polarized light, usually by the selective transmission of polarized rays.
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Learn more about Optical Polarizers
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Topics of Interest
Selecting a glass material is important since different glass types have different characteristics. Edmund Optics offers a wide variety of glass types which can be selected on the basis of the...
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19.2 Lens Data Tables
The lens data tables are quite straightforward, presenting radius, axial thickness, material name, index of refraction, Abbe V-value, and the semi-aperture (sa) for each...
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Overview
The Snell-Descartes law of refraction introduces the index of refraction, n, very early in the development of Optics where, as a matter of fact, it is considered as a normalized value of...
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10.1 Reflection, Absorption, Dispersion
To be useful as an optical material, a substance must meet certain basic requirements. It should be able to accept a smooth polish, be mechanically and...
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3.B.1 Definition and Description of Optical Prisms
Optical prisms are components that are commonly met in optical experimental arrangements and optical instruments; so far their main role has been...
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