Method for determining spherical aberration

Details Method for determining spherical aberration Method for determining spherical aberration

2004-11-06

2009-12-15

Punnoose, Roy (Department: 2886)

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

Reexamination Certificate

active

07633613

ABSTRACT:
The present invention relates to a method and a device for determining spherical aberration occurring during reading from and/or writing to optical recording media.According to the invention, a method for determining spherical aberration includes the steps of:splitting the light beam into at least two partial light beams with a volume hologram having stored wavefront patterns with various degrees of spherical aberration;focusing the partial light beams onto respective detectors, whereby at least one signal generated by the detectors depends on the positions of the respective partial light beam; anddetermining the spherical aberration using the signals generated by the detectors.

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Search Report Dated Aug. 8, 2005.

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