Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1998-06-16
1999-11-30
Sugarman, Scott J.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359708, G02B 2714, G02B 302
Patent
active
059952920
ABSTRACT:
A pair of compensation lenses which provide an adjustable amount of spherical aberration. Each compensation lens has an external surface and an internal surface. The internal surfaces face each other and define an air gap spacing between them. The external surfaces are preferably planar. The internal surfaces are purely aspheric and therefore have an absence of spherical power and an absence of spherical curvature. The amount of spherical aberration compensation is determined by adjusting an air gap spacing between the internal surfaces. The spherical aberration provided by the lenses can be negative, positive, or zero. For compensation of negative spherical aberration present when focusing light into a data storage medium, the compensation lenses should provide positive spherical aberration. The absence of spherical power characteristic of the compensation lenses allows them to be located far from an objective lens which requires spherical aberration compensation. Also, the absence of spherical power renders the focusing characteristics of an optical system independent from the air gap spacing thickness. Further, absence of spherical power renders the numerical aperture of the optical system unchanged by variations in air gap spacing.
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Mack Ricky
Siros Technologies, Inc.
Sugarman Scott J.
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