US3881805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic terminations for acoustically tuned optical filters
Assignee: HP Inc
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Filing: 1974-01-18
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Granted: 1975-05-06
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Expires: 1994-01-18
Abstract
Abstract An acoustic absorber for use in conjunction with an electronically tunable acousto-optic filter is provided. The absorber consists of a mass of acoustic absorbing material such as a lead/gold alloy or a tin/lead alloy, which is affixed to one end of a birefringent crystal used in the construction of the acousto-optic filter. By using an acoustic terminator according to the present invention, acoustic standing waves in the filter arising from internal acoustic reflections may be greatly reduced. This reduction of acoustic standing waves in the filter increases the stability of the optical output of the filter.
Inventors
- 👤 Iii John D Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:19
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/002; G02; G02F; G02F1/00; G02F1/01; G02F1/11; G02F1/116
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
AN ACOUSTIC TERMINATOR FOR AN ACOUSTO-OPTIC FILTER COMPRISING: A METALLIZED ADHESIVE LAYER ON THE SURFACE OF THE FILTER, AND A MASS OF LEAD/GOLD ALLOY ON THE ADHESIVE LAYER, THE ALLOY HAVING A COMPOSITION BY WEIGHT OF LEAD TO GOLD IN THE RANGE 50/50 TO 100/0.
Claim 2
Dependent Claim
45 words
AN ACOUSTIC TERMINATOR FOR AN ACOUSTO-OPTIC FILTER COMPRISING: A METALLIZED ADHESIVE LAYER ON THE SURFACE OF THE FILTER, AND A MASS OF LEAD/GOLD ALLOY ON THE ADHESIVE LAYER, THE ALLOY HAVING A COMPOSITION BY WEIGHT OF LEAD TO GOLD IN THE RANGE 50/50 TO 100/0.
Claim 3
Dependent Claim
21 words
An acoustic terminator as in claim 1 including a metallized protective layer interposed between the adhesive layer and the lead/gold alloy.
Claim 4
Dependent Claim
23 words
An acoustic terminator as in claim 2 wherein the metallized adhesive layer is of chromium and the metallized protective layer is of nickel.
References Cited (Backward Citations)
US3614201A
Cited
US3790898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |