US4475792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High resolution diffraction grating
Assignee: Axia Inc
•
Filing: 1982-07-27
•
Granted: 1984-10-09
•
Expires: 2002-07-27
Abstract
Abstract An optical prism, with an input surface, a reflecting surface and a base, and with a diffraction grating formed on the reflecting surface. The prism is designed so that if an input beam is incident normal to the input surface, then the efficiency of the order diffracted in the direction opposite the input beam is greater than a predetermined value. If the prism is fabricated of a material with index of refraction n, then the resolving power of the grating is increased by n.
Inventors
- 👤 Louis Sica, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:41
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/18; G02B5/1814; G02B5/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
51 words
A spectographic instrument comprising: an optical prism fabricated from a material selected from the group consisting of germanium and cadmium telluride, said prism having an input surface and a reflecting surface, wherein said input surface and said reflecting surface are intersecting planes; and a diffraction grating formed on said reflecting surface.
Claim 2
Dependent Claim
51 words
A spectographic instrument comprising: an optical prism fabricated from a material selected from the group consisting of germanium and cadmium telluride, said prism having an input surface and a reflecting surface, wherein said input surface and said reflecting surface are intersecting planes; and a diffraction grating formed on said reflecting surface.
Claim 3
Dependent Claim
15 words
The spectrographic instrument recited in claim 1 wherein: said diffraction grating is a holographic grating.
Claim 4
Dependent Claim
15 words
The spectrographic instrument recited in claim 1 wherein: said diffraction grating is a blazed grating.
Claim 5
Dependent Claim
73 words
A spectrographic instrument comprising: an optical prism fabricated from a material selected from the group consisting of germanium and cadmium telluride, said prism having an input surface and a reflecting surface, wherein said input surface and said reflecting surface are intersecting planes; and a blazed diffraction grating formed on said reflecting surface, said blazed grating having reflecting faces, wherein the reflecting faces of said diffraction grating are substantially parallel to said input surface.
Claim 6
Dependent Claim
73 words
A spectrographic instrument comprising: an optical prism fabricated from a material selected from the group consisting of germanium and cadmium telluride, said prism having an input surface and a reflecting surface, wherein said input surface and said reflecting surface are intersecting planes; and a blazed diffraction grating formed on said reflecting surface, said blazed grating having reflecting faces, wherein the reflecting faces of said diffraction grating are substantially parallel to said input surface.
Claim 7
Dependent Claim
95 words
A spectrographic instrument comprising: a triangular prism with an input surface, a base, and a reflecting surface, wherein said input surface and said reflecting surface are intersecting planes; and a diffraction grating formed on said reflecting surface wherein said reflecting surface is positioned relative to said input surface so that the efficiency is greater than a predetermined value for the order diffracted by said grating in the direction substantially perpendicular to said input surface, wherein efficiency is defined as the ratio of diffracted energy in a given order to the energy of an input beam.
Claim 8
Dependent Claim
95 words
A spectrographic instrument comprising: a triangular prism with an input surface, a base, and a reflecting surface, wherein said input surface and said reflecting surface are intersecting planes; and a diffraction grating formed on said reflecting surface wherein said reflecting surface is positioned relative to said input surface so that the efficiency is greater than a predetermined value for the order diffracted by said grating in the direction substantially perpendicular to said input surface, wherein efficiency is defined as the ratio of diffracted energy in a given order to the energy of an input beam.
Claim 9
Dependent Claim
15 words
The spectrographic instrument recited in claim 5 wherein: said diffraction grating is a holographic grating.
Claim 10
Dependent Claim
26 words
The spectrographic instrument recited in claim 6 wherein: said triangular prism is fabricated from a material selected from the group consisting of germanium and cadmium telluride.
Claim 11
Dependent Claim
15 words
The spectrographic instrument recited in claim 7 wherein: said diffraction grating is a blazed grating.
References Cited (Backward Citations)
GB312534A
Cited
US2339053A
Cited
US3034398A
Cited
US3658424A
Cited
US3883221A
Cited
SU706711A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |