Hybrid lens with high numerical aperture

Details Hybrid lens with high numerical aperture Hybrid lens with high numerical aperture

2005-08-30

2005-08-30

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Diffraction

From grating

Reexamination Certificate

active

06937396

ABSTRACT:
A hybrid lens with a high numerical aperture is described. The hybrid lens comprises a refractive surface that refracts incident light and a diffractive surface that diffracts light exiting the lens, the diffracting surface designed by a sag satisfying the following Equation:s⁢ ⁢a⁢ ⁢g=fD+m⁢ ⁢λ-fD ⁢2+r ⁢2n-1,wherein fDis a distance from a center peak to a focal point of the hybrid lens, r is a height from a center axis to each peak of the hybrid lens, n is the refractive index of the hybrid lens, λ is the wavelength of incident light and m is an integer. The hybrid lens is small and lightweight and capable of removing chromatic aberration.

REFERENCES:
patent: 5349471 (1994-09-01), Morris et al.
patent: 5715091 (1998-02-01), Meyers

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