Patent US3892979A successfully refreshed from Google Patents.
US3892979A
Expired / Lapsed
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Tunable infra red/ultraviolet laser
Assignee: International Business Machines Corp
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Filing: 1974-04-05
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Granted: 1975-07-01
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Expires: 1994-04-05
Abstract
Abstract An infrared source producing a coherent output having a spectrally narrow and continuously tunable frequency is described. Such a source uses a four wave mixing process in an alkali metal vapor, wherein the initial input beams to the alkali metal vapor come from two dye lasers. In an alternative mode of operation, tunable ultraviolet output is obtained.
Inventors
- 👤 Rodney T Hodgson
- 👤 John R Lankard
- 👤 Peter P Sorokin
- 👤 James J Wynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:13
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/30; H01S3/305
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
A generator of coherent ultraviolet light comprising a first laser for producing a first beam of radiation at a first frequency fL, a nonlinear material having a given energy state above ground level which is connected by a Raman-type process to the ground level, said material being transparent to ultraviolet light, means for directing said first beam into said material so as to create stimulated Raman scattering at a second frequency fS equal to the difference between the first frequency aNd that frequency corresponding to the energy difference between said given energy state and said ground level, a second laser for producing a beam at a third frequency fp, frequency fp corresponding to a higher energy state than that energy state associated with frequency fL, and means for directing said first frequency and third frequency beams into said material whereby all said frequencies mix together to produce a fourth frequency fR in the ultraviolet region, whereby fR fp + fL - fS.
Claim 2
Dependent Claim
162 words
A generator of coherent ultraviolet light comprising a first laser for producing a first beam of radiation at a first frequency fL, a nonlinear material having a given energy state above ground level which is connected by a Raman-type process to the ground level, said material being transparent to ultraviolet light, means for directing said first beam into said material so as to create stimulated Raman scattering at a second frequency fS equal to the difference between the first frequency aNd that frequency corresponding to the energy difference between said given energy state and said ground level, a second laser for producing a beam at a third frequency fp, frequency fp corresponding to a higher energy state than that energy state associated with frequency fL, and means for directing said first frequency and third frequency beams into said material whereby all said frequencies mix together to produce a fourth frequency fR in the ultraviolet region, whereby fR fp + fL - fS.
Claim 3
Dependent Claim
164 words
A generator of coherent ultraviolet light comprising a first tunable laser for producing a first beam of radiation at a first frequency fL, a nonlinear material having a given energy state above ground level which is connected by a Raman-type process to the ground level, said material being transparent to ultraviolet light, means for directing said first beam into said material so as to create stimulated Raman scattering at a second frequency fS equal to the difference between the first frequency and that frequency corresponding to the energy difference between said given energy state and said ground level, a second tunable laser for producing a beam at a third frequency fp, frequency fp corresponding to a higher energy state than that energy state associated with frequency fL, and means for directing said first frequency and third frequency beams into said material whereby all said frequencies mix together to produce a fourth frequency fR in the ultraviolet region, whereby fR fp + fL - fS.
Claim 4
Dependent Claim
164 words
A generator of coherent ultraviolet light comprising a first tunable laser for producing a first beam of radiation at a first frequency fL, a nonlinear material having a given energy state above ground level which is connected by a Raman-type process to the ground level, said material being transparent to ultraviolet light, means for directing said first beam into said material so as to create stimulated Raman scattering at a second frequency fS equal to the difference between the first frequency and that frequency corresponding to the energy difference between said given energy state and said ground level, a second tunable laser for producing a beam at a third frequency fp, frequency fp corresponding to a higher energy state than that energy state associated with frequency fL, and means for directing said first frequency and third frequency beams into said material whereby all said frequencies mix together to produce a fourth frequency fR in the ultraviolet region, whereby fR fp + fL - fS.
Claim 5
Dependent Claim
21 words
The generator of claim 2 wherein a second material is added to said nonlinear material so as to provide phase matching.
Claim 6
Dependent Claim
14 words
The generator of claim 1 wherein said nonlinear material is an alkali metal vapor.
References Cited (Backward Citations)
US3371265A
Cited
US3795819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |