US4492466A
Expired / Lapsed
US
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Cylindrical grating monochromator for synchrotron radiation
Assignee: Nokia Bell Labs
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Filing: 1982-06-28
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Granted: 1985-01-08
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Expires: 2002-06-28
Abstract
Abstract A tunable monochromator having variable groove spacing whereby each wavelength is diffracted to the same point and which is tuned by translating the grating parallel to a rotational symmetry axis is disclosed.
Inventors
- 👤 David E. Aspnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:53
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A monochromator comprising a grating, said grating having a plurality of grooves with variable groove spacing, d, and entrance and exit slits, said grating being rotationally symmetric about an axis between said entrance slit and said exit slit whereby the diffraction into the exit slit occurs at the same wavelength for each ray incident on said grating from said entrance, said variable groove spacing is approximately of the form d=d o exp (-ay) where d o is the separation between the grooves at y o , a is a constant, and y is the coordinate parallel to said symmetry axis.
Claim 2
Dependent Claim
100 words
A monochromator comprising a grating, said grating having a plurality of grooves with variable groove spacing, d, and entrance and exit slits, said grating being rotationally symmetric about an axis between said entrance slit and said exit slit whereby the diffraction into the exit slit occurs at the same wavelength for each ray incident on said grating from said entrance, said variable groove spacing is approximately of the form d=d o exp (-ay) where d o is the separation between the grooves at y o , a is a constant, and y is the coordinate parallel to said symmetry axis.
Claim 3
Dependent Claim
14 words
A monochromator as recited in claim 1 in which said grating comprises a cylinder.
Claim 4
Dependent Claim
20 words
A monochromator as recited in claim 2 in which d o is between approximately 0.3 μm and approximately 3.3 μm.
Claim 5
Dependent Claim
21 words
A monochromator as recited in claim 3 in which the distance of said cylinder from said axis is approximately 0.25 m.
Claim 6
Dependent Claim
25 words
A monochromator as recited in claim 1 in which said grating forms an image point and said exit slit is located at the image point.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |