Spherical aberration detection

Details Spherical aberration detection Spherical aberration detection

2007-11-06

2007-11-06

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Focal position of light source

C356S125000

Reexamination Certificate

active

10531937

ABSTRACT:
The invention relates to an optical device in which a spherical aberration is detected. The optical device comprises means (206, 208) for focussing a first radiation beam (203) having a first numerical aperture and a second radiation beam (204) having a second numerical aperture lower than the first numerical aperture, on an information carrier (200). The optical device further comprises means (211) for detecting a first focus error signal corresponding to the first radiation beam and a second focus error signal corresponding to the second radiation beam. In order to measure the spherical aberration of the first radiation beam, due to a variation of the cover layer thickness of the information carrier, the optical device comprises means (212) for measuring a spherical aberration of the first radiation beam from the first and second focus error signals.

REFERENCES:
patent: 6229600 (2001-05-01), Martynov

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