Patent US1965635A successfully refreshed from Google Patents.
Patent US3787779A successfully refreshed from Google Patents.
US3787779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable wavelength optical source using the simulated emission effect
Assignee: Thales SA
•
Filing: 1972-04-14
•
Granted: 1974-01-22
•
Expires: 1992-04-14
Abstract
Abstract The present invention relates to stimulated emission radiation sources and, more precisely, to a dye laser in which the wavelength of the radiation emitted is varied by modifying the voltage applied to a thin film of a cholesteric liquid crystal which replaces one of the mirrors of the resonant optical cavity. This invention can be used as an adjustable wavelength coherent radiation source.
Inventors
- 👤 E Spitz
- 👤 D Ostrowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:29
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/10; H01S3/106; H01S3/1065; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/1313; H01S3/02; H01S3/022; H01S3/05; H01S3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A stimulated emission optical source, emitting wavelengths adjustable by means of applied voltages and comprising : an active medium ; a pumping radiaTion generator for producing said stimulated emission in said medium ; a flat mirror ; a semi-reflective device associated with said mirror in order to form an optical cavity containing said active medium, said cavity having a high quality factor for adjustable wavelengths, said quality factor being adjustable by means of said applied voltages ; said semi-reflective associated device including a cholesteric liquid crystal film, at least two transparent electrodes, and means for applying said voltages to said electrodes and across said film ; said film having a first and a second face and said first and second faces being respectively equipped with at least one of said electrodes.
Claim 2
Dependent Claim
131 words
A stimulated emission optical source, emitting wavelengths adjustable by means of applied voltages and comprising : an active medium ; a pumping radiaTion generator for producing said stimulated emission in said medium ; a flat mirror ; a semi-reflective device associated with said mirror in order to form an optical cavity containing said active medium, said cavity having a high quality factor for adjustable wavelengths, said quality factor being adjustable by means of said applied voltages ; said semi-reflective associated device including a cholesteric liquid crystal film, at least two transparent electrodes, and means for applying said voltages to said electrodes and across said film ; said film having a first and a second face and said first and second faces being respectively equipped with at least one of said electrodes.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |