US4379622A
Expired / Lapsed
US
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Broad band phase shift system
Assignee: Coherent Inc
•
Filing: 1980-10-02
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Granted: 1983-04-12
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Expires: 2000-10-02
Abstract
Abstract A broad band phase shifting system, having a fixed angle of phase retardation, has at least one broad band reflecting means in the system. The broad band reflecting means also has an angle of phase retardation, with the angle of phase retardation of the reflecting means less than the fixed angle of phase retardation of the system.
Inventors
- 👤 Dennis G. Fischer
- 👤 Arnold L. Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:53
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/50; G; G02; G02B; G02B5/00; G02B5/30; G02B5/3083
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
A broad band phase shift system having phase retardation of substantially ninety degrees comprising: two substantially identical reflecting means, each having an angle of phase retardation of substantially forty-five degrees; each reflecting means comprising: a substrate of a material having high reflectivity; a plurality of first dielectric material having low refractive index; a plurality of second dielectric material having high refractive index; and said first and second dielectric materials on said substrate in alternate layers.
Claim 2
Dependent Claim
75 words
A broad band phase shift system having phase retardation of substantially ninety degrees comprising: two substantially identical reflecting means, each having an angle of phase retardation of substantially forty-five degrees; each reflecting means comprising: a substrate of a material having high reflectivity; a plurality of first dielectric material having low refractive index; a plurality of second dielectric material having high refractive index; and said first and second dielectric materials on said substrate in alternate layers.
Claim 3
Dependent Claim
80 words
The system of claim 1, wherein said reflecting means is constructed substantially in accordance with the following dimensions and materials: ______________________________________
Material Thickness (in microns)
______________________________________
(1) .2097
(2) .9099
(1) 1.1735
(2) .8776
(1) .7308
(2) .6818
(1) .6769
(2) .9021
(1) 1.2384
(2) 1.2356
(1) 1.2692
(2) 1.2544
(1) 1.0382
(2) 1.0456
(1) .9985
(2) .6944
(1) .2904
S 1.0000
______________________________________ on a bulk for support where S=silver (1)=ZnS or TiO 2 (2)=ThF 4 or SiO 2 .
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) | 1986-04-11 | 1986-10-11 | 1987-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-11 | 1990-10-11 | 1991-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-11 | 1994-10-11 | 1995-04-12 | $7700.00 | Window Closed / Lapsed |