Spherical aberration correction apparatus

Details Spherical aberration correction apparatus Spherical aberration correction apparatus

2006-09-19

2006-09-19

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

07110343

ABSTRACT:
An aberration correction apparatus includes a first aberration correction element having aberration correction portions, a second aberration correction element which causes the wave front of the transmitted light beam to have a blaze hologram shape, a discriminator which discriminates the aberration of the reflected light beam, a coarse phase adjuster which drives the second aberration correction element on the basis of the magnitude of the aberration of the reflected light beam, and a fine phase adjuster which corrects aberration remained after the aberration correction by the coarse phase adjuster.

REFERENCES:
patent: 6532202 (2003-03-01), Wada et al.
patent: 10-106012 (1998-04-01), None
patent: 10-269911 (1998-10-01), None

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