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15 terms
Photonics Dictionary
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lens blank x
lens blank
A lens blank is a piece of optical material in a raw, unfinished state, typically in the form of a disk or block, from which lenses are eventually fabricated. Lens blanks are made from various...
absorption spectroscopy
Absorption spectroscopy is a fundamental analytical technique used to study the interaction between electromagnetic radiation and matter. It involves measuring the absorption of light by a sample...
countersink
The concave portion of a surface, formed on a blank, on which the disk of higher refractive glass will be fused to form a multifocal spectacle lens.
far-infrared grating
A grating with very coarse rulings to match the long wavelengths in the far-infrared region. In the most efficient ruling method, grooves are cut in plane, solid aluminum alloy blanks.
layout
In the optical shop, the process of positioning and marking a blank or lens before surfacing, cutting and edging.
lens molding
The production of rough glass lens blanks that are pressed while red-hot to the approximate size and shape of the finished lens, ready for fine grinding and polishing. Large companies often do their...
major
A blank to which a piece of glass of a different refractive index will be fused to form a multifocal lens.
molded blank
A blank whose basic surface curves are attained by heating and forming a given weight of raw glass; a rough glass blank resembling the finished lens in size and shape. After molding, a precision lens...
multiple lens block
A block that can hold more than one lens or blank.
optical glass
Optical glass refers to a type of glass specifically engineered and manufactured for use in optical components and systems, such as lenses, prisms, mirrors, and filters. Optical glass is...
picking
The process whereby pitch is broken and the lenses or blanks are removed from the block.
repressing
->
molded blank
A blank whose basic surface curves are attained by heating and forming a given weight of raw glass; a rough glass blank resembling the finished lens in size and shape. After molding, a precision lens...
semifinished
A term used to describe a spectacle lens or blank with one surface totally finished.
spotted tool
A metal tool used to hold a number of lens blanks during grinding and polishing.
xylene
Fluid used to aid in examination of semifinished blanks.
Photonics Dictionary
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