Patent US3980397A successfully refreshed from Google Patents.
US3980397A
Expired / Lapsed
US
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Diffraction smoothing aperture for an optical beam
Assignee: Energy Research and Development Administration ERDA
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Filing: 1975-05-09
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Granted: 1976-09-14
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Expires: 1995-05-09
Abstract
Abstract The disclosure is directed to an aperture for an optical beam having an irregular periphery or having perturbations imposed upon the periphery to decrease the diffraction effect caused by the beam passing through the aperture. Such apertures are particularly useful with high power solid state laser systems in that they minimize the problem of self-focusing which frequently destroys expensive components in such systems.
Inventors
- 👤 O'Dean P. Judd
- 👤 Bergen R. Suydam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:35
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/58; H; H01; H01S; H01S3/00; H01S3/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
In combination with a solid state laser, an opaque sheet having an aperture therein, the aperture being substantially circular and having a periphery, the radius of said periphery varying randomly to provide irregular perturbations of said periphery, the maximum attained radial extent of said perturbations being substantially 10 per cent of the average radius of said aperture, means for passing a beam from said laser through said aperture, the diameter of said beam being at least as great as the average diameter of said aperture whereby the diffraction caused central intensity peak in said beam is smoothed.
Claim 2
Dependent Claim
97 words
In combination with a solid state laser, an opaque sheet having an aperture therein, the aperture being substantially circular and having a periphery, the radius of said periphery varying randomly to provide irregular perturbations of said periphery, the maximum attained radial extent of said perturbations being substantially 10 per cent of the average radius of said aperture, means for passing a beam from said laser through said aperture, the diameter of said beam being at least as great as the average diameter of said aperture whereby the diffraction caused central intensity peak in said beam is smoothed.
References Cited (Backward Citations)
US3426293A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |