Patent US3628045A successfully refreshed from Google Patents.
US3628045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser harmonic generator
Assignee: AT&T Inc
•
Filing: 1969-04-24
•
Granted: 1971-12-14
•
Expires: 1989-04-24
Abstract
Abstract In a harmonic generator of the type that includes a laser gain element and a nonlinear optical element both positioned along a main axis of the generator, the laser element may be absorptive of a substantial portion of the harmonic signal generated within the nonlinear element. To prevent such absorption the nonlinear element is positioned in an off-axis path, and the harmonic signal generated therein is directed so as not to traverse the absorptive laser element.
Inventors
- 👤 Ronald B Chesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:17
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/109; H01S3/05; H01S3/08; H01S3/081
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
214 words
A laser harmonic generator comprising means including a laser gain element for generating a fundamental signal and propagating said signal along a main axis of said generator, means interposed in the path of said fundamental signal for directing said signal along an off-axis path, a nonlinear optical element positioned in said off-axis path and responsive to said fundamental signal for generating a second harmonic signal, and means defining the end of said off-axis path for reflecting both said fundamental and said second harmonic signals back along said off-axis path to said directing means, said directing means being structured to reflect said fundamental along said main axis but to transmit said second harmonic along a path that does not traverse said laser gain element, said means for generating a fundamental signal comprising a first mirror, said directing means comprising a second mirror, said first mirror being highly reflective to said fundamental signal and being adapted to propagate said fundamental signal along said main axis, said first and second mirrors being spaced apart to include said laser gain element therebetween, said second mirror being highly reflective to said fundamental signal and highly transmissive to said second harmonic signal and being curved to achieve a desired spot size of said fundamentaL signal in said nonlinear optical element.
Claim 2
Dependent Claim
214 words
A laser harmonic generator comprising means including a laser gain element for generating a fundamental signal and propagating said signal along a main axis of said generator, means interposed in the path of said fundamental signal for directing said signal along an off-axis path, a nonlinear optical element positioned in said off-axis path and responsive to said fundamental signal for generating a second harmonic signal, and means defining the end of said off-axis path for reflecting both said fundamental and said second harmonic signals back along said off-axis path to said directing means, said directing means being structured to reflect said fundamental along said main axis but to transmit said second harmonic along a path that does not traverse said laser gain element, said means for generating a fundamental signal comprising a first mirror, said directing means comprising a second mirror, said first mirror being highly reflective to said fundamental signal and being adapted to propagate said fundamental signal along said main axis, said first and second mirrors being spaced apart to include said laser gain element therebetween, said second mirror being highly reflective to said fundamental signal and highly transmissive to said second harmonic signal and being curved to achieve a desired spot size of said fundamentaL signal in said nonlinear optical element.
Claim 3
Dependent Claim
28 words
A generator as in claim 1 wherein said means defining the end of said off-axis path comprises a mirror member in intimate contact with said nonlinear optical element.
Claim 4
Dependent Claim
18 words
A generator as in claim 2 wherein said laser gain element is made of neodymium-doped yttrium aluminum garnet.
Claim 5
Dependent Claim
17 words
A generator as in claim 3 wherein said nonlinear optical element is made of barium sodium niobate.
References Cited (Backward Citations)
US3487230A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-13 | 1975-06-14 | 1975-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-13 | 1979-06-14 | 1979-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-13 | 1983-06-14 | 1983-12-14 | $7700.00 | Window Closed / Lapsed |