US3766498A
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US
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Method and apparatus for producing electromagnetic transient coherent effects
Assignee: International Business Machines Corp
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Filing: 1972-04-06
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Granted: 1973-10-16
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Expires: 1992-04-06
Abstract
Abstract Electromagnetic transient coherent effects such as photon echo and optical nutation are produced by directing cw laser radiation into a gaseous medium such as C13H3F and NH2D, contained in a Stark cell, and by applying Stark pulses which shift the molecular levels into resonance with the cw laser radiation. The effects lend themselves to applications in optical modulation, data communication, superradiance, spectroscopy, memory and pulse height to frequency conversion, among others.
Inventors
- 👤 R Brewer
- 👤 R Shoemaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:18
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/17; G02F1/174; G02F2203/00; G02F2203/26
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
13 words
The method of claim 1 wherein the electromagnetic beam is a laser beam.
Claim 2
Dependent Claim
13 words
The method of claim 1 wherein the electromagnetic beam is a microwave beam.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein the step of applying a voltage to the Stark cell is applying the voltage as a step function Stark field whereby a nutation signal and optical free induction decay occur in the medium.
Claim 4
Dependent Claim
43 words
The method of claim 1 wherein the step of applying a voltage to the Stark cell is applying two Stark pulses whose pulse interval is less than the molecular relaxation time of the gas, whereby a photon echo is generated in the gas.
Claim 5
Dependent Claim
44 words
The method of claim 1 wherein the step of applying a voltage to the Stark cell is applying three Stark pulses whose pulse interval is less than the molecular relaxation time of the medium, whereby a stimulated photon echo is generated in the medium.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the tunable medium is a gas medium.
Claim 7
Dependent Claim
28 words
The method of claim 2 wherein the electromagnetic beam is a CO2 laser and the medium is a gas chosen from the group consisting of C13H3F and NH2D.
Claim 8
Independent Claim
67 words
The method of optically modulating a coherent electromagnetic beam comprising the steps of: directing a coherent directional electromagnetic beam into a Stark cell containing a resonant frequency tunable medium; applying a voltage pulse with a risetime of less than the molecular relaxation time of the resonant frequency tunable medium to the Stark cell to selectively tune the medium into or out of resonance with the incoming beam.
Claim 9
Independent Claim
114 words
A method of optically modulating a coherent electromagnetic beam to transmit data thereby comprising the steps of: directing a coherent directional electromagnetic beam into a Stark cell containing a resonant frequency tunable medium; applying voltage pulses having a risetime of less than the molecular relaxation time of the resonant frequency tunable medium to the Stark cell to selectively tune the medium into or out of resonance with the incoming beam to generate a modulated beam, the magnitude and frequency of the voltage pulses representative of data to be transmitted by the beam; and detecting and demodulating the beam transmitted through the Stark cell to convert the beam into data representative of the original data.
Claim 10
Dependent Claim
13 words
The method of claim 10 wherein the tunable medium is a gas medium.
Claim 11
Dependent Claim
14 words
The method of claim 10 wherein the coherent directional electromagnetic beam is a laser.
Claim 12
Dependent Claim
61 words
Apparatus for producing electromagnetic transient coherent effects comprising: means for generating a coherent directional electromagnetic beam; and modulating means comprising a resonant frequency tunable medium located to intercept the beam, including means for tuning the resonant frequency tunable medium into or out of resonance in a pulse interval having a risetime of less than the molecular relaxation time of the medium.
Claim 13
Dependent Claim
18 words
The apparatus of claim 13 wherein the means for generating a coherent directional electromagnetic beam is a laser.
Claim 14
Dependent Claim
19 words
The apparatus of claim 13 wherein the means for generating a coherent directional electromagnetic beam is a microwave generator.
Claim 15
Dependent Claim
13 words
The apparatus of claim 13 wherein the modulating means is a Stark cell.
Claim 16
Dependent Claim
15 words
The apparatus of claim 13 wherein the resonant frequency tunable medium is a gas medium.
Claim 17
Dependent Claim
25 words
The apparatus of claim 13 wherein the means for tuning the resonant frequency tunable medium tunes the medium in response to a predetermined data pattern.
Claim 18
Dependent Claim
20 words
The apparatus of claim 18 including means for detecting the beam after the beam is intercepted by the modulating means.
Claim 19
Dependent Claim
20 words
The apparatus of claim 19 including means for converting the modulated beam into data representative of the preDetermined data pattern.
References Cited (Backward Citations)
US2714660A
Cited
US3581228A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |