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Photonics Spectra
Nov 2004
MACRO IMAGING SYSTEM The LC-PolScope macro imaging system from Cambridge Research & Instrumentation (CRI) Inc. is designed to measure retardance and slow-axis orientation of a 40 × 30-mm sample in less than 3 s. The system provides a method for measuring and analyzing low-level birefringence in samples with 0.02-nm sensitivity. It automates the process of quantitative birefringence metrology, allowing the user to calculate retardance magnitude and orientation at every pixel within seconds. The instrument can be used to measure stress in glass, glass-to-metal interfaces, optical materials, disks, thin films, polymers, fibers and biological specimens. A microscopic system also is available.

The separation of a light beam, as it penetrates a doubly refracting object, into two diverging beams, commonly known as ordinary and extraordinary beams.  
A noncrystalline, inorganic mixture of various metallic oxides fused by heating with glassifiers such as silica, or boric or phosphoric oxides. Common window or bottle glass is a mixture of soda, lime and sand, melted and cast, rolled or blown to shape. Most glasses are transparent in the visible spectrum and up to about 2.5 µm in the infrared, but some are opaque such as natural obsidian; these are, nevertheless, useful as mirror blanks. Traces of some elements such as cobalt, copper and...
The science of measurement, particularly of lengths and angles.
optical materials
Materials that, by virtue of their optical characteristics (i.e. refractive index, dispersion,  etc.), are used in optical elements. See crystal; glass; plastic lens.
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