Diffractive optical element, objective optical system,...

Details Diffractive optical element, objective optical system,... Diffractive optical element, objective optical system,...

2004-12-02

2008-01-15

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

C369S112030

Reexamination Certificate

active

07319655

ABSTRACT:
A diffractive optical element, comprises a first diffractive structure to generate n11-th order diffracted ray when a first light flux having λ1 (nm) of a wavelength comes in and to generate n21-th order diffracted ray (n11.≧n21) when a second light flux having λ2 (nm) (λ2>λ1) comes in; and a second diffractive structure to generate n12-th order diffracted ray when the first light flux comes in and to generate n22-th order diffracted ray (n12.≧n22) when the second light comes in. The diffractive optical element satisfies the following formula: δφA12≠δφB12, where δφA12={n11·λ1/(N11−1)}/{n21·λ2/(N21−1)}, and δφB12={n12·λ1/(N12−1)}/{n22·λ2/(N22−1)}, wherein N11, N21are refractive index of the first diffractive structure respectively for λ1and λ2, and N12, N22are refractive index of the second diffractive structure respectively for λ1and λ2.

REFERENCES:
patent: 6201780 (2001-03-01), Katayama

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