| 摘要 |
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; and determining the spherical aberration using the signals generated by the detectors.
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