US3639775A
Expired / Lapsed
US
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Acoustically controlled optical devices
Assignee: AT&T Inc
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Filing: 1970-08-03
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Granted: 1972-02-01
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Expires: 1990-08-03
Abstract
Abstract The acoustically controlled optical devices disclosed employ an optically transparent piezoelectric medium, such as a Beta quartz. The devices disclosed include an optical beam deflector in which the deflected beam is the second harmonic of two likefrequency input beams, which are phase-matched for generation of the second-harmonic beam propagating in the desired direction by an acoustic wave generated by an array of acoustic transducers. A second device is an optical frequency shifter employing light scattering from the mixed excitations called polaritons. The acoustic wave controls the frequency of the polaritons that do the light scattering.
Inventors
- 👤 Chandra Kumar Naranbhai Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:55
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/30; G; G02; G02F; G02F1/00; G02F1/29; G02F1/33; G02F1/35; G02F1/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
In combination, a piezoelectric crystal that is substantially transparent throughout a substantial frequency range around the optical frequency omega 1, said crystal having the capability of transmitting scattered radiation at frequency omega s in response to an interaction with radiation of the frequency omega 1, where omega 1- omega s omega is the frequency of a polariton in said crystal, a source of a beam of radiation at frequency omega 1 directed toward said crystal for scattering interaction therein, means associated with said crystal for resonating scattered radiation and transmitting a portion thereof, and means for generating an acoustic wave in said crystal to select the value of omega s.
Claim 2
Dependent Claim
110 words
In combination, a piezoelectric crystal that is substantially transparent throughout a substantial frequency range around the optical frequency omega 1, said crystal having the capability of transmitting scattered radiation at frequency omega s in response to an interaction with radiation of the frequency omega 1, where omega 1- omega s omega is the frequency of a polariton in said crystal, a source of a beam of radiation at frequency omega 1 directed toward said crystal for scattering interaction therein, means associated with said crystal for resonating scattered radiation and transmitting a portion thereof, and means for generating an acoustic wave in said crystal to select the value of omega s.
Claim 3
Dependent Claim
66 words
A combination according to claim 4 in which the means for generating an acoustic wave comprises an acoustic transducer on a first surface of the crystal essentially normal to the direction of the beam of radiation at frequency omega 1, whereby the acoustic wave propagates essentially parallel to said direction and provides collinear phase-matching of said beam, said scattered radiation, said acoustic wave and said polariton.
Claim 4
Dependent Claim
79 words
A combination according to claim 5 in which the means for generating an acoustic wave comprises an annular acoustic transducer centered about the axis of propagation of the radiation of frequency omega 1, an annular acoustic termination on a second surface of said crystal opposite and essentially parallel to the first surface, and a variable drive source coupled to said acoustic transducer to select the value of omega s in inverse dependence upon the power of said drive source.
Claim 5
Dependent Claim
13 words
A combination according to claim 6 in which the crystal is Alpha -quartz.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |