Optical systems employing stepped diffractive surfaces
US6262844A · kind A · utility
20Cited by
18References
25Claims
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Key dates
| Filing date | Aug 27, 1999 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Aug 27, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Stepped diffractive surfaces (13) are used to reduce variations in the optical properties of an optical system as a result of a change in the temperature of all or a portion of the system. Such surfaces have optothermal coefficients which differ from the optothermal coefficients of both kinoforms and refractive elements. Accordingly, stepped diffractive surfaces can be combined with such elements to achieve overall thermal control of optical systems employing such elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.