Optical element, optical objective element, and optical...

Details Optical element, optical objective element, and optical... Optical element, optical objective element, and optical...

2003-09-19

2009-12-22

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112260, C359S569000

Reexamination Certificate

active

07636290

ABSTRACT:
An optical element comprises: a diffractive structure having a plurality of diffracting ring-shaped zones arranged around an optical axis on at least one optical surface; and an optical path difference giving structure arranged on an optical surface of at least one of the plurality of diffracting ring-shaped zones, for giving a prescribed optical path difference to a prescribed light beam passing through the diffracting ring-shaped zone, wherein the optical surface of the diffractive structure is a structure having a diffracting function for setting L-th (L≠0) order diffracted light of the light beam having the first wavelength λ1to a maximum diffraction efficiency and for setting M-th (M≠0) order diffracted light of the light beam having the second wavelength λ2to a maximum diffraction efficiency in case of an assumption of no existence of the optical path difference giving structure.

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