Patent US3411507A successfully refreshed from Google Patents.
US3609583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for controlling the frequency of a light source using an absorption cell
Assignee: Thales SA
•
Filing: 1969-08-13
•
Granted: 1971-09-28
•
Expires: 1989-08-13
Abstract
Abstract An arrangement for controlling the frequency of a monochromatic light source, wherein said light wave is caused to propagate out and back through a cell containing a gas or a vapor having an absorption line and wherein the light wave is frequency modulated and feedback loop, between the frequency-controlling means of the light source and an output collecting the wave reflected through the said cell, is provided for monitoring the frequency of said light source.
Inventors
- 👤 Henri Brun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:39
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/06; H01S5/068; H01S5/0683; H01S5/0687
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
73 words
An arrangement as claimed in claim 1, wherein said monitoring means comprise: first means for frequency modulating said source by a modulating signal; second means for controlling the mean frequency of said source; and third means detecting said reflected light wave to provide a detected signal and receiving said modulating signal for comparing the phase of said modulating signal and said detected signal and for supplying a control signal to said second means.
Claim 2
Dependent Claim
57 words
An arrangement as claimed in claim 2, wherein said first means comprise an oscillator generating said modulating signal and said third means comprise a photoelectric cell for receiving said reflected light wave and a phase comparator having two inputs respectively connected to said photoelectric cell and to said oscillator and an output for supplying said control signal.
Claim 3
Dependent Claim
23 words
An arrangement as claimed in claim 3, wherein said vapor is caesium vapor and said light source is a gallium arsenide laser diode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |