Patent EP0267672A2 successfully refreshed from Google Patents.
EP0267672A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Mirrors of polarization sensitive reflectivity
Assignee: BAE Systems PLC
•
Filing: 1987-08-21
•
Granted: —
•
Expires: 2007-08-21
Abstract
Abstract A mirror for a ring laser gyroscope comprising a multi-layer dielectric stack and a layer having an optical thickness of a half wavelength so as to enhance absorption of s-polarised radiation relative to that of p-polarised radiation.
Inventors
- 👤 Walter Scott Dr. British Aerospace P.L.C. Carter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 11:16
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02B5/3025; G02B5/3033; G01; G01C; G01C19/00; G01C19/58; G01C19/64; G01C19/66; G01C19/68
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
26 words
A mirror comprising a multi-layer dielectric (MLD) reflective stack and which is designed to enhance the reflection of p-polarised light relative to that of s-polarised light.
Claim 2
Dependent Claim
26 words
A mirror comprising a multi-layer dielectric (MLD) reflective stack and which is designed to enhance the reflection of p-polarised light relative to that of s-polarised light.
Claim 3
Dependent Claim
21 words
A mirror according claim 1 which is designed to enhance the absorption of s-polarised light relative to that of p-polarised light.
Claim 4
Dependent Claim
29 words
A mirror according to claim 2 in which the thickness of one or more layers of the MLD reflective stack is chosen so as to depart from optimum reflectivity.
Claim 5
Dependent Claim
29 words
A mirror according to claim 3 wherein said one or more layers have an optical thickness of a half-wavelength of the incident radiation at a predetermined angle of incidence.
Claim 6
Dependent Claim
27 words
A mirror according to claim 3 or claim 4 wherein said one or more layers are positioned at or near the top of the MLD reflective stack.
Claim 7
Dependent Claim
26 words
A mirror according to claim 3 or claim 4 wherein said one or more layers are positioned remote from the top of the MLD reflective stack.
Claim 8
Dependent Claim
22 words
A mirror according to claim 1 which is designed to enhance the transmission of s-polarised light relative to that of p-polarised light.
Claim 9
Dependent Claim
20 words
A mirror according to claim 7 comprising a metal layer underlying a control dielectric layer and the MLD reflective stack.
Claim 10
Dependent Claim
13 words
A mirror according to claim 8 wherein the metal is gold or silver.
Claim 11
Dependent Claim
20 words
A mirror according to claim 7 comprising an off-tune MLD underlying a control dielectric layer and the MLD reflective stack.
Claim 12
Dependent Claim
11 words
A mirror according to any preceding claim comprising a magneto-optic layer.
Claim 13
Dependent Claim
14 words
A mirror according to claim 11 wherein the magneto-optic layer comprises a garnet material.
Claim 14
Dependent Claim
24 words
A ring laser gyroscope in which at least one of the mirrors defining the lasing cavity falls within the scope of any preceding claim.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.