US4303840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single beam second harmonic generation in isotropic media
Assignee: AT&T Inc
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Filing: 1980-10-27
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Granted: 1981-12-01
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Expires: 2000-10-27
Abstract
Abstract The present invention relates to an apparatus for providing second harmonic generation from a single beam in an isotropic medium. An isotropic medium having a two-photon transition between a first level and a second level with a quadrupole moment therebetween is exposed to a beam of laser radiation. The photons in the laser beam have an energy which is substantially equal to one-half the energy difference between the first and second levels.
Inventors
- 👤 John E. Bjorkholm
- 👤 Richard R. Freeman
- 👤 Richard L. Panock
- 👤 William E. Cooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:07
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/3526; G02F1/355
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
74 words
Apparatus for providing second harmonic generation of radiation in a laser beam which comprises: an isotropic medium, disposed to intercept said radiation in said laser beam, said isotropic medium having a two-photon transition between a first level and a second level with a quadrupole moment therebetween, the energy difference between said first and second levels being substantially close to twice the energy of at least a portion of the photons in said laser beam.
Claim 2
Dependent Claim
74 words
Apparatus for providing second harmonic generation of radiation in a laser beam which comprises: an isotropic medium, disposed to intercept said radiation in said laser beam, said isotropic medium having a two-photon transition between a first level and a second level with a quadrupole moment therebetween, the energy difference between said first and second levels being substantially close to twice the energy of at least a portion of the photons in said laser beam.
Claim 3
Dependent Claim
27 words
Apparatus in accordance with claim 1 wherein said isotropic medium is atomic sodium and said laser radiation includes radiation in the vicinity substantially equal to 5788 angstroms.
Claim 4
Dependent Claim
26 words
Apparatus in accordance with claim 1 wherein said isotropic medium is mercury and said laser radiation includes radiation in the vicinity substantially equal to 2800 angstroms.
Claim 5
Dependent Claim
26 words
Apparatus in accordance with claim 1 wherein said isotropic medium is krypton and said laser radiation includes radiation in the vicinity substantially equal to 1930 angstroms.
Claim 6
Dependent Claim
81 words
Apparatus for providing sum or difference frequency generation of radiation in two collinear laser beams which comprises: an isotropic medium, disposed to intercept said radiation in said collinear laser beams, said isotropic medium having a two-photon transition between a first level and a second level with a quadrupole moment therebetween, the energy difference between said first and second levels being substantially close to the sum or difference frequency of at least a portion of the photons in said collinear laser beams.
Claim 7
Dependent Claim
81 words
Apparatus for providing sum or difference frequency generation of radiation in two collinear laser beams which comprises: an isotropic medium, disposed to intercept said radiation in said collinear laser beams, said isotropic medium having a two-photon transition between a first level and a second level with a quadrupole moment therebetween, the energy difference between said first and second levels being substantially close to the sum or difference frequency of at least a portion of the photons in said collinear laser beams.
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) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |