Achromatic and apochromatic prism element employing prisms and gratings
US5625499A · kind A · utility
33Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1996 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | Jan 24, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0037
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apochromatic grism (42) includes a first prism (48) with a second prism (50) disposed adjacent to it. A grating (44) is adjacent to the front surface of the first prism (48) and the Abbe number and dispersion coefficient of the grating are chosen such that the primary and secondary angular spread for a given spectral band is approximately zero. The apochromatic grism is a simple and compact device with minimal amounts of residual chromatic and anamorphic aberrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.