Patent US3824488A successfully refreshed from Google Patents.
US3824488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mode selective laser line-scanner
Assignee: EIDP Inc
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Filing: 1973-04-18
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Granted: 1974-07-16
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Expires: 1993-04-18
Abstract
Abstract A crystal of a material having ferroelastic properties and having a face ''''bent'''' to a concave rooftop shape by intersection of a domain wall is provided with a reflecting coating on the ''''bent'''' face. The rooftop mirror is employed off-axis in an optical resonant cavity containing a superradiant medium to form a laser. An image of coherent light can be extracted from the cavity which moves as the domain wall is moved.
Inventors
- 👤 C Aleksoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:49
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; H; H01; H01S; H01S3/00; H01S3/10; H01S3/101
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
158 words
A scanning laser comprising an off-axis resonant cavity containing a lasing medium comprising a first mirror and a second mirror adjacent said first mirror and a third mirror spaced from said first and said second mirrors, said first mirror consisting of a substrate crystal of a material having ferroelastic properties having a reflective coating on one face thereof, said crystal being divided into two domains by a domain wall, said domain wall intersecting the face of said crystal having the reflective coating, whereby said face is bent concavely at the intersection of said domain wall; and having one of said first and said second mirrors partially reflective; means to focus the light on said coating at the said domain wall of said first mirror; means to move the said domain wall in said crystal whereby the light resonant in said cavity follows the domain wall; and means to focus the light emerging from said cavity to an image.
Claim 2
Dependent Claim
158 words
A scanning laser comprising an off-axis resonant cavity containing a lasing medium comprising a first mirror and a second mirror adjacent said first mirror and a third mirror spaced from said first and said second mirrors, said first mirror consisting of a substrate crystal of a material having ferroelastic properties having a reflective coating on one face thereof, said crystal being divided into two domains by a domain wall, said domain wall intersecting the face of said crystal having the reflective coating, whereby said face is bent concavely at the intersection of said domain wall; and having one of said first and said second mirrors partially reflective; means to focus the light on said coating at the said domain wall of said first mirror; means to move the said domain wall in said crystal whereby the light resonant in said cavity follows the domain wall; and means to focus the light emerging from said cavity to an image.
Claim 3
Dependent Claim
38 words
Apparatus of claim 1 wherein said first mirror is a crystal of a rare earth molybdate having the Beta ''-gadolinium molybdate structure having a domain wall intersecting a (110) face, and having a reflective coating on said face.
Claim 4
Dependent Claim
11 words
Apparatus of claim 2 wherein said crystal is Beta ''-gadolinium molybdate.
Claim 5
Dependent Claim
11 words
Apparatus of claim 1 wherein said crystal is Alpha -lead phosphate.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |