Patent US3735280A successfully refreshed from Google Patents.
US3735280A
Expired / Lapsed
US
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White-light laser using dye coupling
Assignee: AT&T Inc
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Filing: 1971-08-11
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Granted: 1973-05-22
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Expires: 1991-08-11
Abstract
Abstract There are disclosed several arrangements for balanced threecolor laser light sources. Also disclosed is a modulation arrangement which makes a three-color source readily adaptable for use in a color television receiver. The arrangements are based upon the use of a broadband gain medium, such as a dye laser medium, to modify the intensity relationship between two or more independent transitions or two or more competing transitions of a single laser medium. The same technique can be used with cascaded laser transitions.
Inventors
- 👤 W Johnston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:20
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/108; H01S3/109; H01S3/05; H01S3/06; H01S3/07; H01S3/08; H01S3/08086; H01S3/09; H01S3/091; H01S3/094; H01S3/0941; H01S3/14; H01S3/16; H01S3/168; H01S3/20; H01S3/213
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A laser comprising an active medium having at least two transitions capable of lasing, means for resonating the radiation from said transitions, means for pumping said active medium, said resonating means and said pumping means producing radiation from the shortest wavelength one of said transitions substantially in excess of its oscillation threshold and radiation from at least another longer wavelength transition near its respective oscillation threshold, and means including a second laser active medium within said resonating means for absorbing a portion of the radiation from said one shortest wavelength transition to produce a population inversion in said second medium at said other wavelength and at a third wavelength that is longer than the shortest wavelength, said absorbing means and said resonating means providing a third oscillating radiation at said third wavelength, whereby stable oscillations are obtained at all three wavelengths.
Claim 2
Dependent Claim
141 words
A laser comprising an active medium having at least two transitions capable of lasing, means for resonating the radiation from said transitions, means for pumping said active medium, said resonating means and said pumping means producing radiation from the shortest wavelength one of said transitions substantially in excess of its oscillation threshold and radiation from at least another longer wavelength transition near its respective oscillation threshold, and means including a second laser active medium within said resonating means for absorbing a portion of the radiation from said one shortest wavelength transition to produce a population inversion in said second medium at said other wavelength and at a third wavelength that is longer than the shortest wavelength, said absorbing means and said resonating means providing a third oscillating radiation at said third wavelength, whereby stable oscillations are obtained at all three wavelengths.
Claim 3
Dependent Claim
49 words
A laser according to claim 1 in which the two transitions of the active medium are independent transitions, and said absorbing means has an absorption for a portion of the radiation of the shorter wavelength transition and provides gain for the longer wavelength transition to couple said two transitions.
Claim 4
Dependent Claim
66 words
A laser according to claim 1 in which the two transitions of the active medium are competing transitions, said resonator favoring the shorter wavelength transition in the absence of the absorbing means, and the absorbing means has an absorption for a portion of the radiation of the shorter wavelength transition and provides gain for the longer wavelength transition to reduce the competition of said two transitions.
Claim 5
Dependent Claim
112 words
A laser comprising an active medium having at least two transitions of first and second frequencies integrally related to the frequencies of blue and green light, said transitions both being capable of lasing, means for resonating the radiation from said transitions, and a second active medium capable of lasing at a third frequency integrally related to a frequency in the red portion of the spectrum, said second medium being disposed in said resonating means to absorb a portion of one of the radiations at one of the said first and second frequencies, the absorption of said second medium providing a selected balance of radiation intensities at the first, second and third frequencies.
Claim 6
Dependent Claim
112 words
A laser comprising an active medium having at least two transitions of first and second frequencies integrally related to the frequencies of blue and green light, said transitions both being capable of lasing, means for resonating the radiation from said transitions, and a second active medium capable of lasing at a third frequency integrally related to a frequency in the red portion of the spectrum, said second medium being disposed in said resonating means to absorb a portion of one of the radiations at one of the said first and second frequencies, the absorption of said second medium providing a selected balance of radiation intensities at the first, second and third frequencies.
Claim 7
Dependent Claim
110 words
A laser comprising an active medium having three transitions of first, second and third frequencies that are respectively half of the frequencies of red, green and blue light, said transitions all being capable of lasing, means for resonating the radiation from said transitions, means for providing a selected balance of radiations from said transitions, comprising at least one dye-containing active medium disposed in said resonator and characterized by absorption for at least one of the radiations of the second and third frequencies and by resultant gain for the others of said radiations, and frequency-doubling means disposed in said resonator for generating said red, green and blue light from said radiations.
Claim 8
Dependent Claim
110 words
A laser comprising an active medium having three transitions of first, second and third frequencies that are respectively half of the frequencies of red, green and blue light, said transitions all being capable of lasing, means for resonating the radiation from said transitions, means for providing a selected balance of radiations from said transitions, comprising at least one dye-containing active medium disposed in said resonator and characterized by absorption for at least one of the radiations of the second and third frequencies and by resultant gain for the others of said radiations, and frequency-doubling means disposed in said resonator for generating said red, green and blue light from said radiations.
Claim 9
Dependent Claim
58 words
A laser according to claim 5 in which the frequency-doubling means comprises three phase-matched optical second harmonic generators and means for driving said generators in response to signals to vary the degree of phase matching and provide modulation of the light, whereby the red, green and blue light components exhibit coupled interaction to any one of said signals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |