Diffractive optical element and an optical system having a diffractive optical element
US6392805B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 18, 1999 |
| Grant date | May 21, 2002 |
| Priority date | — |
| Expiry date | Mar 18, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1866
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A diffractive optical element for white light is composed of a plurality of layers of optical materials and has a relief pattern constituting a diffraction grating formed at least at one cementing interface between the two different optical materials. The grating height of the relief pattern constituting the diffraction grating is defined by h=&lgr;/n−n′|, where h represents the grating height of the relief pattern constituting the diffraction grating; &lgr; represents the design wavelength, which is less than or equal to 450 nm; n represents the refractive index of the optical material abutting the interface from the object side for light of the wavelength &lgr;; and n′ represents the refractive index of the optical material abutting the interface from the image side for light of the wavelength &lgr;.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.