Aberration compensating optical element, optical system,...

Details Aberration compensating optical element, optical system,... Aberration compensating optical element, optical system,...

2005-03-08

2005-03-08

Dunn, Drew A. (Department: 2872)

Optical: systems and elements

Diffraction

From zone plate

C359S566000, C359S571000, C369S112080

Reexamination Certificate

active

06865025

ABSTRACT:
An aberration compensating optical element includes: a diffractive structure having a plurality of ring-shaped zone steps formed into substantially concentric circles on at least one surface of the aberration compensating optical element; wherein the aberration compensating optical element is adapted for being disposed on an optical path between a light source for emitting a light having a wavelength of not more than 550 nm, and an objective lens made of a material having an Abbe constant of not more than 95.0 at a d-line; and wherein the following inequality is satisfied: Pλ1<Pλ0<Pλ2, where Pλ0is a paraxial power (mm−1) of the aberration compensating optical element at the wavelength λ0of the light emitted from the light source; Pλ1is a paraxial power (mm−1) of the aberration compensating optical element at a wavelength λ1which is 10 nm shorter than the wavelength λ0; and Pλ2is a paraxial power (mm−1) of the aberration compensating optical element at a wavelength λ2which is 10 nm longer than the wavelength λ0.

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