Patent US3646474A successfully refreshed from Google Patents.
US3646474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrically pumped slab laser
Assignee: American Optical Corp
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Filing: 1969-04-21
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Granted: 1972-02-29
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Expires: 1989-04-21
Abstract
Abstract The combination of apparatus for exfocal symmetrically pumping with a generally rectangular slab-type laser. The arrangement is especially suited to substantially overcome problems of birefringence induced by thermal gradients in a laser being pumped.
Inventors
- 👤 Joseph P Segre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:17
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/09; H01S3/091; H01S3/0915; H01S3/092; H01S3/093; H01S3/0931; H01S3/05; H01S3/06; H01S3/0602; H01S3/0606
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
The combination for use as a high repetition rate laser system comprising an elongated slablike laser rod, said slablike laser rod being elongated along an axis along which laser energy is propagated during operation of said system, said slablike laser rod being of generally rectangular cross section, and having an aspect ratio of width to thickness of greater than 2:1 with symmetrically oriented pumping means and reflecting devices therefor, the aspect ratio defining on the slablike laser rod a pair of major side faces and a pair of minor side faces, each of said faces being parallel to the axis of said slablike laser rod, and the induced thermal gradients in the slablike laser rod during laser operation being substantially parallel to the plane of the major surfaces of the slablike laser rod whereby one plane of polarization of said laser energy is parallel to the induced thermal gradients and the other plane is orthogonal thereto.
Claim 2
Dependent Claim
156 words
The combination for use as a high repetition rate laser system comprising an elongated slablike laser rod, said slablike laser rod being elongated along an axis along which laser energy is propagated during operation of said system, said slablike laser rod being of generally rectangular cross section, and having an aspect ratio of width to thickness of greater than 2:1 with symmetrically oriented pumping means and reflecting devices therefor, the aspect ratio defining on the slablike laser rod a pair of major side faces and a pair of minor side faces, each of said faces being parallel to the axis of said slablike laser rod, and the induced thermal gradients in the slablike laser rod during laser operation being substantially parallel to the plane of the major surfaces of the slablike laser rod whereby one plane of polarization of said laser energy is parallel to the induced thermal gradients and the other plane is orthogonal thereto.
Claim 3
Dependent Claim
19 words
The arrangement of claim 1 in which the slablike laser rod has an aspect ratio of at least 3:1.
Claim 4
Dependent Claim
25 words
The arrangement of claim 1 in which the slablike laser rod and pumping means are longitudinally aligned along a common axis within a cylindrical reflector.
Claim 5
Dependent Claim
14 words
The arrangement of claim 3 in which said reflector is elliptical in cross section.
Claim 6
Dependent Claim
51 words
The arrangement of claim 3 in which said reflector comprises a pair of intersecting elliptical reflectors and in which said slablike laser rod spans the distance between adjacent foci of said two elliptical reflectors, said pair of reflectors, slablike laser rod, and pumping means all being bisected by a common plane.
Claim 7
Dependent Claim
25 words
The arrangement of claim 1 in which said pumping means comprises a helical light source wound about said slablike laser rod along the length thereof.
Claim 8
Dependent Claim
51 words
The arrangement of claim 1 in which said slablike laser rod is mounted across the width of a cylindrical reflector in a plane common with a bisector of said reflector, and there being a pair of symmetrically arranged pump sources within said reflector on either side of said slablike laser rod.
Claim 9
Dependent Claim
20 words
The arrangement of claim 1 in which said slablike laser rod is a rear earth oxide doped glass laser rod.
Claim 10
Dependent Claim
52 words
The arrangement of claim 1 in which said slablike laser rod is a ruby slab so cut that the optical axis thereof is in a plane perpendicular to the long side of the cross section thereof and in which the ordinary ray in the ruby has a polarization orientation across its width.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |