US3663897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of modulating a laser beam and related apparatus
Assignee: University of Bern
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Filing: 1970-02-06
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Granted: 1972-05-16
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Expires: 1990-02-06
Abstract
Abstract A laser technique by which an additional resonator is coupled to a diode laser provided with a first resonator and driven by an adjustable current, the laser beam traversing the additional resonator and emerging through a semi-translucent component thereof. The emerging beam can be passed through a light switch controlled by a communication source.
Inventors
- 👤 Ronald Francis Johnston Broom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:47
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/105; H01S3/05; H01S3/08; H01S3/081; H01S3/082; H01S5/00; H01S5/10; H01S5/1021; H01S5/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
A method of modulating a laser beam which is produced by a diode laser which is energized by an adjustable electric current and which is provided with a resonator, said method comprising coupling a resonator to the diode laser and tuning the same to the frequency f10 for which the intensity of noises of the diode laser is maximum at the adjusted energizing current.
Claim 2
Independent Claim
64 words
A method of modulating a laser beam which is produced by a diode laser which is energized by an adjustable electric current and which is provided with a resonator, said method comprising coupling a resonator to the diode laser and tuning the same to the frequency f10 for which the intensity of noises of the diode laser is maximum at the adjusted energizing current.
Claim 3
Dependent Claim
70 words
A method according to claim 1, wherein the second resonator is an optical resonator with a length L, comprising adjusting the length L to comply with the equation wherein: m is an integer c is the velocity of light l is the length of the diode laser n is the refractive index of the material of which the diode laser is composed v is the optical frequency of the beam
Claim 4
Dependent Claim
51 words
Laser apparatus comprising a diode laser, energizing means for energizing the laser with an adjustable electric current, an optical resonator for the laser, and a second optical resonator coupled to the diode laser and transversed by the beam thereof, the length of said second resonator being adjustable according to the equation:
Claim 5
Dependent Claim
51 words
Laser apparatus comprising a diode laser, energizing means for energizing the laser with an adjustable electric current, an optical resonator for the laser, and a second optical resonator coupled to the diode laser and transversed by the beam thereof, the length of said second resonator being adjustable according to the equation:
Claim 6
Dependent Claim
17 words
Apparatus as claimed in claim 3 comprising an electric resonance circuit in parallel with the energizing means.
Claim 7
Dependent Claim
19 words
Apparatus as claimed in claim 3 comprising means by which the emergent laser beam is modulated by carrier-frequency pulses.
Claim 8
Dependent Claim
17 words
Apparatus as claimed in claim 3 comprising means by which the emergent laser beam is sinusoidally modulated.
Claim 9
Dependent Claim
48 words
Apparatus as claimed in claim 3, wherein the second optical resonator comprises a specular surface and a partially translucent concave reflector between which is mounted a condenser lens, the emergent laser ray modulated by carrier frequence f10 emerging from the second resonator through the partially translucent concave reflector.
Claim 10
Dependent Claim
25 words
Apparatus as claimed in claim 7 comprising a communication source, and a light switch mounted behind the concave reflector and controlled by said communiCation source.
Claim 11
Dependent Claim
39 words
Apparatus as claimed in claim 8 comprising means which rotates the plane of polarization of the laser beam under the influence of an electric field, and a consecutive polarization filter which transmits light from only one direction of polarization.
Claim 12
Dependent Claim
45 words
Apparatus as claimed in claim 9 comprising an analog-digital transducer between the communication source and the first-mentioned light-switch component and being synchronized with carrier frequency f10 in order to extinguish those of the successive pulses which correspond to the communication signal according to a code.
Claim 13
Dependent Claim
35 words
Laser apparatus comprising a diode laser, energizing means for energizing the laser with an adjustable electric current, an optical resonator for the laser, and an electric resonance circuit coupled in parallel to the energizing means.
Claim 14
Dependent Claim
35 words
Laser apparatus comprising a diode laser, energizing means for energizing the laser with an adjustable electric current, an optical resonator for the laser, and an electric resonance circuit coupled in parallel to the energizing means.
References Cited (Backward Citations)
US3504302A
Cited
US3478280A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |