Patent US4754746A successfully refreshed from Google Patents.
US3435371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser mode selection apparatus
Assignee: AT&T Inc
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Filing: 1965-12-17
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Granted: 1969-03-25
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Expires: 1985-12-17
Abstract
No abstract record available.
Inventors
- 👤 Alan D White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:51
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/082; H01S3/08054
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
147 words
LASER APPARATUS COMPRISING: A LASER MEDIUM FOR RADIATING COHERENT LIGHT WITHIN A PREDETERMINED FREQUENCY BAND; FIRST AND SECOND MIRRORS DEFINING A PRIMARY OPTICAL CAVITY FOR REPEATEDLY DIRECTING THE LIGHT THROUGH THE LASER MEDIUM FOR COMULATIVE GAIN; A THIRD MIRROR; MEANS COMPRISING A BIREFRINGENT MEDIUM LOCATED IN THE PRIMARY OPTICAL CAVITY FOR DIRECTING LIGHT OF A FIRST LINEAR POLARIZATION TO THE SECOND MIRROR AND FOR DIRECTING LIGHT OF A SECOND LINEAR POLARIZATION TO THE THIRD MIRROR; THE FIRST AND THIRD MIRRORS DEFINING AN AUXILIARY OPTICAL CAVITY WHICH IS AN INTEGRAL NUMBER OF HALF WAVELENGTHS LONGER THAN THE PRIMARY OPTICAL CAVITY AT A DESIRED FREQUENCY WITHIN THE PREDETERMINED FREQUENCY BAND OF THE LASER MEDIUM; AND MEANS COMPRISING A BREWSTER ANGLE WINDOW LOCATED BETWEEN SAID FIRST MIRROR AND SAID BIREFRINGENT MEDIUM FOR ATTENUATING LIGHT ENERGY AT FREQUENCIES OTHER THAN THOSE AT WHICH BOTH THE PRIMARY AND AUXILIARY CAVITIES ARE RESONANT.
Claim 2
Dependent Claim
147 words
LASER APPARATUS COMPRISING: A LASER MEDIUM FOR RADIATING COHERENT LIGHT WITHIN A PREDETERMINED FREQUENCY BAND; FIRST AND SECOND MIRRORS DEFINING A PRIMARY OPTICAL CAVITY FOR REPEATEDLY DIRECTING THE LIGHT THROUGH THE LASER MEDIUM FOR COMULATIVE GAIN; A THIRD MIRROR; MEANS COMPRISING A BIREFRINGENT MEDIUM LOCATED IN THE PRIMARY OPTICAL CAVITY FOR DIRECTING LIGHT OF A FIRST LINEAR POLARIZATION TO THE SECOND MIRROR AND FOR DIRECTING LIGHT OF A SECOND LINEAR POLARIZATION TO THE THIRD MIRROR; THE FIRST AND THIRD MIRRORS DEFINING AN AUXILIARY OPTICAL CAVITY WHICH IS AN INTEGRAL NUMBER OF HALF WAVELENGTHS LONGER THAN THE PRIMARY OPTICAL CAVITY AT A DESIRED FREQUENCY WITHIN THE PREDETERMINED FREQUENCY BAND OF THE LASER MEDIUM; AND MEANS COMPRISING A BREWSTER ANGLE WINDOW LOCATED BETWEEN SAID FIRST MIRROR AND SAID BIREFRINGENT MEDIUM FOR ATTENUATING LIGHT ENERGY AT FREQUENCIES OTHER THAN THOSE AT WHICH BOTH THE PRIMARY AND AUXILIARY CAVITIES ARE RESONANT.
Claim 3
Dependent Claim
130 words
LASER APPARATUS COMPRISING A LASER MEDIUM FOR GENERATING A COHERENT LIGHT BEAM WITHIN A PREDETERMINED FREQUENCY BAND AND ALONG A CENTRAL AXIS; FIRST AND SECOND MIRRORS DEFINING A PRIMARY OPTICAL CAVITY FOR REPEATEDLY DIRECTING LIGHT THROUGH THE LASER MEDIUM FOR CUMULATIVE GAIN; A THIRD MIRROR; AN APERTURE PLATE BETWEEN THE FIRST AND SECOND MIRRORS HAVING AN APERTURE OF THE SAME SIZE AS THAT OF A HIGHER ORDER ODD SYMMETRICAL TRANSVERSE MODE AT A DESIRED FREQUENCY WITHIN SAID FREQUENCY BAND WIDTH; THE SECOND MIRROR INTERCEPTING HALF OF THE LIGHT BEAM ALONG A DIAMETRICAL LINE OF THE LIGHT BEAM; THE THIRD MIRROR INTERCEPTING THE REMAINDER OF THE LIGHT BEAM; THE FIRST AND THRID MIRRORS DEFINING AN AUXILIARY OPTICAL CAVITY WHICH IS AN INTEGRAL NUMBER OF HALF WAVELENGTHS LONGER THAN THE PRIMARY CAVITY.
Claim 4
Dependent Claim
130 words
LASER APPARATUS COMPRISING A LASER MEDIUM FOR GENERATING A COHERENT LIGHT BEAM WITHIN A PREDETERMINED FREQUENCY BAND AND ALONG A CENTRAL AXIS; FIRST AND SECOND MIRRORS DEFINING A PRIMARY OPTICAL CAVITY FOR REPEATEDLY DIRECTING LIGHT THROUGH THE LASER MEDIUM FOR CUMULATIVE GAIN; A THIRD MIRROR; AN APERTURE PLATE BETWEEN THE FIRST AND SECOND MIRRORS HAVING AN APERTURE OF THE SAME SIZE AS THAT OF A HIGHER ORDER ODD SYMMETRICAL TRANSVERSE MODE AT A DESIRED FREQUENCY WITHIN SAID FREQUENCY BAND WIDTH; THE SECOND MIRROR INTERCEPTING HALF OF THE LIGHT BEAM ALONG A DIAMETRICAL LINE OF THE LIGHT BEAM; THE THIRD MIRROR INTERCEPTING THE REMAINDER OF THE LIGHT BEAM; THE FIRST AND THRID MIRRORS DEFINING AN AUXILIARY OPTICAL CAVITY WHICH IS AN INTEGRAL NUMBER OF HALF WAVELENGTHS LONGER THAN THE PRIMARY CAVITY.
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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |