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Patent US4498184A successfully refreshed from Google Patents.
US4498184A
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US
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Jinc-trap resonator
Assignee: United States, UNITED STATES AIR FORCE, Secretary of
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Filing: 1983-04-12
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Granted: 1985-02-05
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Expires: 2003-04-12
Abstract
Abstract A Jinc-trap resonator has a Fourier transform resonator structure with a Jinc-trap spatial filter disposed in one of two opposite end transform planes. A near Jinc-like mode is effectively trapped at the one plane where the filter is located, while a corresponding transform mode that is nearly constant in amplitude and flat in phase is located at the opposite transform plane. The Jinc-trap spatial filter is composed of a first series of concentric absorption bands and a second series of concentric reflecting bands which alternate in position with the absorption bands.
Inventors
- 👤 Thomas R. O'Meara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:46
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08018; H01S3/0804; H01S3/0805; H01S3/10; H01S3/10076
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
A Jinc-trap resonator, comprising: (a) a Fourier transform lens defining an optical axis with right and left transform planes disposed along said axis one focal length from either side of the center of said lens; (b) a laser gain medium disposed at a location along said optical axis between said lens and a first one of said right and left transform planes of said lens; (c) reflecting means disposed at said first one of said transform planes of said lens; and (d) a Jinc-trap spatial filter disposed at a second one of said right and left transform planes of said lens, whereby a Jinc mode represented by the Bessel function J 1 (X)/(X) is effectively trapped at said second one of said transform planes while a corresponding transform mode that is nearly constant in amplitude and flat in phase is located at said first one of said transform planes.
Claim 2
Dependent Claim
149 words
A Jinc-trap resonator, comprising: (a) a Fourier transform lens defining an optical axis with right and left transform planes disposed along said axis one focal length from either side of the center of said lens; (b) a laser gain medium disposed at a location along said optical axis between said lens and a first one of said right and left transform planes of said lens; (c) reflecting means disposed at said first one of said transform planes of said lens; and (d) a Jinc-trap spatial filter disposed at a second one of said right and left transform planes of said lens, whereby a Jinc mode represented by the Bessel function J 1 (X)/(X) is effectively trapped at said second one of said transform planes while a corresponding transform mode that is nearly constant in amplitude and flat in phase is located at said first one of said transform planes.
Claim 3
Dependent Claim
37 words
The resonator as recited in claim 1, wherein said spatial filter is comprised of a first series of concentric absorption bands and a second series of concentric reflecting bands which alternate in position with said absorption bands.
Claim 4
Dependent Claim
18 words
The resonator as recited in claim 2, wherein an inner central circular area of said filter is reflecting.
Claim 5
Dependent Claim
28 words
The resonator as recited in claim 1, wherein said spatial filter exhibits low loss for the desired Jinc-like field distribution and much higher loss for Gaussian-like field distributions.
Claim 6
Dependent Claim
15 words
The resonator as recited in claim 1, wherein said reflecting means is a normal mirror.
Claim 7
Dependent Claim
16 words
The resonator as recited in claim 1, wherein said reflecting means is a phase conjugate mirror.
Claim 8
Dependent Claim
25 words
The resonator as recited in claim 1, further comprising: (e) output means disposed along said optical axis between said lens and said laser gain medium.
Claim 9
Dependent Claim
15 words
The resonator as recited in claim 7, wherein said output means comprises a beam splitter.
References Cited (Backward Citations)
US3136959A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |