Grism (grating-prism combination)
US5652681A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 1996 |
| Grant date | Jul 29, 1997 |
| Priority date | — |
| Expiry date | Jan 11, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/1814
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A dispersive optical element called a "grism" (50) which has characteristics of both a prism (56) and a grating (62). The grism (50) consists of a prism (56) with a grating (62) disposed adjacent to one surface of the prism (56). Light passing through the grism (50) is dispersed by both the prism (56) and the grating (62). The grating (62) may be attached to either the first or second surface of the prism (56) or may be simply adjacent to the prism (56). The grism (50) has dispersive characteristics such as resolving power that can be optimized in a very flexible manner by choice of both the grating (62) and prism (56) characteristics. For example, the grating (62) may be used to amplify the angular spread introduced by a prism (56). Also different diffractive orders of the grating (62) may be used simultaneously. The result is a device with a very flexible and improved dynamic range of its resolving power, which is particularly useful in applications such as spectrometers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.