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ACHROMATIC LENSES

Photonics Spectra
Sep 2004
Newport CorporationRequest Info
 
ACHROMATIC LENSES The precision achromatic doublet lens series launched by Newport Corp. includes focal lengths from 12.7 to 750 mm, in standard diameters of 6.35, 12.7, 25.4, 38.1, 50.8 and 76.2 mm. Focal-length tolerance is ±2%, scratch-dig is 40-20, and per-surface reflectivity is 0.5% throughout the visible spectrum, with surface irregularity of l/8 or better. The lenses are suitable for laser focusing because their high correction for spherical aberration results in smaller spot sizes, and their large field of view facilitates alignment.


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GLOSSARY
spherical aberration
That basic aberration which leads to the failure of a lens to form a perfect image of a monochromatic, on-axis point source object. Aspheric surfaces may be applied to reduce this defect. When rays from a point on the axis passing through the outer lens zones are focused closer to the lens than rays passing the central zones, the lens is said to have negative spherical aberration; if the outer zones have a longer focal length than the inner zones, the lens is said to have positive spherical...
visible spectrum
That region of the electromagnetic spectrum to which the retina is sensitive and by which the eye sees. It extends from about 400 to 750 nm in wavelength.
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