Patent US4748631A successfully refreshed from Google Patents.
US4748631A
Expired / Lapsed
US
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Modulated laser source for optical storage
Assignee: International Business Machines Corp
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Filing: 1987-05-06
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Granted: 1988-05-31
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Expires: 2007-05-06
Abstract
Abstract A time modulated source of frequency doubled laser radiation is described in which a non-linear crystal part of a stripline electrical circuit is mounted within a laser cavity so that the laser beam at a fundamental frequency impinges on and propagates through the non-linear crystal. A high bandwidth electrical data signal is coupled into the stripline electrical circuit to produce an electric field across the non-linear crystal so that an output beam is produced at a wavelength corresponding to the second harmonic of the fundamental frequency which represents a frequency doubled output beam modulated in accordance with the high bandwidth data signal, an alternate embodiment for producing the time modulated source of frequency doubled laser radiation has the non-linear crystal placed in a resonant microwave cavity. A high bandwidth electrical signal modulates the intensity of the microwave electric field across the non-linear crystal so that an output beam is produced at a wavelength corresponding to the second harmonic of the fundamental frequency which represents a frequency doubled output beam modulated in accordance with the high bandwidth data signal.
Inventors
- 👤 Gary C. Bjorklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:00
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/109
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
103 words
Apparatus for producing a time modulated source of frequency doubled laser radiation comprising: a stripline electrical circuit; a non-linear crystal forming part of said stripline electrical circuit; laser means for producing laser radiation comprising a beam at a fundamental wavelength; means for mounting said stripline electrical circuit so that said beam at a fundamental wavelength impinges on and propagates through said non-linear crystal; a high bandwidth electrical signal; and means for coupling said electrical signal into said stripline electrical circuit to produce an electric field across said non-linear crystal which controls the intensity of an output beam produced at the second harmonic wavelength.
Claim 2
Dependent Claim
103 words
Apparatus for producing a time modulated source of frequency doubled laser radiation comprising: a stripline electrical circuit; a non-linear crystal forming part of said stripline electrical circuit; laser means for producing laser radiation comprising a beam at a fundamental wavelength; means for mounting said stripline electrical circuit so that said beam at a fundamental wavelength impinges on and propagates through said non-linear crystal; a high bandwidth electrical signal; and means for coupling said electrical signal into said stripline electrical circuit to produce an electric field across said non-linear crystal which controls the intensity of an output beam produced at the second harmonic wavelength.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 wherein said non-linear crystal is mounted internal to the optical cavity of said laser means producing said beam at a fundamental wavelength.
Claim 4
Dependent Claim
32 words
The apparatus of claim 2 wherein said non-linear crystal is an inorganic material selected from the group consisting of potassium titanyl phosphate, potassium niobate, lithium niobate, beta barium borate and lithium iodate.
Claim 5
Dependent Claim
13 words
The apparatus of claim 3 wherein said non-linear crystal is potassium titanyl phosphate.
Claim 6
Dependent Claim
13 words
The apparatus of claim 4 wherein said laser means is a Nd:YAG laser.
Claim 7
Dependent Claim
18 words
The apparatus of claim 5 wherein a semiconductor diode laser is used to optically pump said Nd:YAG laser.
Claim 8
Dependent Claim
26 words
The apparatus of claim 2 wherein said non-linear crystal is an organic material selected from the group consisting of MNA, NPP, POM, MAP, DAN and COANP.
Claim 9
Dependent Claim
97 words
Apparatus for producing a time modulated source of frequency doubled laser radiation comprising: a resonant microwave cavity; a non-linear crystal mounted within said resonant microwave cavity; laser means for producing laser radiation comprising a beam at a fundamental wavelength; means for mounting said cavity so that said beam at a fundamental wavelength impinges on and propagates through said non-linear crystal; a high bandwidth electrical signal; and means for coupling said electrical signal to produce a modulated microwave electrical field across said non-linear crystal which controls the intensity of an output beam produced at the second harmonic wavelength.
Claim 10
Dependent Claim
97 words
Apparatus for producing a time modulated source of frequency doubled laser radiation comprising: a resonant microwave cavity; a non-linear crystal mounted within said resonant microwave cavity; laser means for producing laser radiation comprising a beam at a fundamental wavelength; means for mounting said cavity so that said beam at a fundamental wavelength impinges on and propagates through said non-linear crystal; a high bandwidth electrical signal; and means for coupling said electrical signal to produce a modulated microwave electrical field across said non-linear crystal which controls the intensity of an output beam produced at the second harmonic wavelength.
Claim 11
Dependent Claim
27 words
The apparatus of claim 8 wherein said non-linear crystal is mounted internal to the optical cavity of said laser means producing said beam at a fundamental wavelength.
Claim 12
Dependent Claim
32 words
The apparatus of claim 9 wherein said non-linear crystal is an inorganic material selected from the group consisting of potassium titanyl phosphate, potassium niobate, lithium niobate, beta barium borate and lithium iodate.
Claim 13
Dependent Claim
13 words
The apparatus of claim 10 wherein said non-linear crystal is potassium titanyl phosphate.
Claim 14
Dependent Claim
13 words
The apparatus of claim 11 wherein said laser means is a Nd:YAG laser.
Claim 15
Dependent Claim
18 words
The apparatus of claim 12 wherein a semiconductor diode laser is used to optically pump said Nd:YAG laser.
Claim 16
Dependent Claim
26 words
The apparatus of claim 10 wherein said non-linear crystal is an organic material selected from the group consisting of MNA, NPP, POM, MAP, DAN and COANP.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |