Patent US4929063A successfully refreshed from Google Patents.
US4929063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonlinear tunable optical bandpass filter
Assignee: Honeywell Inc
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Filing: 1986-01-22
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Granted: 1990-05-29
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Expires: 2006-01-22
Abstract
Abstract A nonlinear tunable optical bandpass filter of the Fabry-Perot type is disclosed comprising an optically transparent substrate and a plurality of multilayer coatings deposited on a facing side of the substrate. One of the coating layers comprises a spacer being a nonlinear optical coating material having an externally-variable refractive index. The spacer is bounded on two ends by structures of multilayer stacks being alternating thin films of transparent, physically compatible materials. The filter of the invention can be tuned to pass various transmittance wavelengths through the application of external activation apparatus, such as heating by a laser acting on the spacer.
Inventors
- 👤 William W. Durand
- 👤 Ronald E. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:28
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/21; G02F1/0126; G02F1/0147; G02F1/213
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A tunable Fabry-Perot filter comprising: a substrate; a first coating on said substrate; a second coating on said first coating, the second coating having activatable nonlinear optical properties and an optical thickness of one-half of the design transmittance wavelengths at ambient temperatures and wherein the second coating comprises silver sulfide; a third coating on said second coating wherein the first and third coatings include material selected from the group consisting of thallium chloride and silver chloride; and activation means for changing the optical properties of said second coating so as to tune the filter to a desired wavelength.
Claim 2
Dependent Claim
98 words
A tunable Fabry-Perot filter comprising: a substrate; a first coating on said substrate; a second coating on said first coating, the second coating having activatable nonlinear optical properties and an optical thickness of one-half of the design transmittance wavelengths at ambient temperatures and wherein the second coating comprises silver sulfide; a third coating on said second coating wherein the first and third coatings include material selected from the group consisting of thallium chloride and silver chloride; and activation means for changing the optical properties of said second coating so as to tune the filter to a desired wavelength.
Claim 3
Dependent Claim
16 words
The device of claim 1 wherein the activation means is provided by electrical resistance heating means.
Claim 4
Dependent Claim
15 words
The device of claim 1 wherein the activation means is provided by laser radiation means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |