US3628849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffraction gratings
Assignee: A Jobin & G Yvon Instruments De Precision
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Filing: 1969-06-13
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Granted: 1971-12-21
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Expires: 1989-06-13
Abstract
Abstract The invention relates to new gratings constituted by a support bearing on a sensitive face the grooves of the gratings which are located at the intersection of the said face of the support by a family of surfaces geometrically such as the equiphase surfaces obtained as loci of the maxima of luminous intensity upon the interference of two beams originating from two point sources. These gratings may be realized by holography, by using as sensitive layer a layer of a photopolymerizable resin, the best results being obtained with a layer of thickness smaller than approximately 2 microns. These gratings are useful for the realization of new or improved spectrographic devices.
Inventors
- 👤 Jean Flamand
- 👤 Antoine Labeyrie
- 👤 Guy Pieuchard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G01; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/1838
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A grooved diffraction grating being perfectly corrected for aberrations for certain wavelengths and having a percentage aberration smaller than that of conventional gratings comprising a support having a sensitive face bearing the grooves of the grating, the spacing between adjacent grating grooves varying across the grating, said grooves forming said grating defining at the intersection with said face of said support a family of hyperbolae. A diffraction grating comprising a support having a sensitive face provided with grooves of the grating, said grooves being located at the intersection on said face of the support of a family of hyperboloids.
Claim 2
Dependent Claim
99 words
A grooved diffraction grating being perfectly corrected for aberrations for certain wavelengths and having a percentage aberration smaller than that of conventional gratings comprising a support having a sensitive face bearing the grooves of the grating, the spacing between adjacent grating grooves varying across the grating, said grooves forming said grating defining at the intersection with said face of said support a family of hyperbolae. A diffraction grating comprising a support having a sensitive face provided with grooves of the grating, said grooves being located at the intersection on said face of the support of a family of hyperboloids.
Claim 3
Dependent Claim
21 words
A diffraction grating according to claim 1 wherein the sensitive face of the support has the shape of a spherical calotte.
Claim 4
Dependent Claim
35 words
A diffraction grating according to claim 2, wherein said spherical calotte has a center of curvature located at one of the foci of family hyperboloids whose intersection with said support defines said family of hyperbolae.
References Cited (Backward Citations)
US3523734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |