GB2006456A - Magneto-Optical Phase- Modulating Devices - Google Patents

Magneto-Optical Phase- Modulating Devices

Info

Publication number
GB2006456A
GB2006456A GB7837896A GB7837896A GB2006456A GB 2006456 A GB2006456 A GB 2006456A GB 7837896 A GB7837896 A GB 7837896A GB 7837896 A GB7837896 A GB 7837896A GB 2006456 A GB2006456 A GB 2006456A
Authority
GB
United Kingdom
Prior art keywords
layer
magneto
reflection
optic
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB7837896A
Other versions
GB2006456B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unisys Group Services Ltd
Original Assignee
Sperry Rand Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sperry Rand Ltd filed Critical Sperry Rand Ltd
Priority to GB7837896A priority Critical patent/GB2006456B/en
Publication of GB2006456A publication Critical patent/GB2006456A/en
Application granted granted Critical
Publication of GB2006456B publication Critical patent/GB2006456B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • G01C19/58—Turn-sensitive devices without moving masses
    • G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
    • G01C19/66—Ring laser gyrometers
    • G01C19/68—Lock-in prevention
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on magneto-optical elements, e.g. exhibiting Faraday effect

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The reflectivity at the surface of a magneto-optic layer of garnet (bismuth doped, or praseodymium) or orthoferrite material intended to provide phase modulation in a ring laser gyroscope system is modified by an adjacent dielectric layer or stack of dielectric layers, e.g. alternately ZnS & MgF2. For use as a transverse Ker magneto-optic effect mirror forming part of the laser ring the layer(s) provide increased reflection; for use as a Faraday effect element between two mirrors of the laser ring the layer(s) act as anti-reflection components. In either case the magneto-optic layer may lie directly on a transparent substrate provided on its opposite surface with anti-reflection layer(s), or preferably the substrate may have deposited therein in turn the reflectivity modifying layer(s), the magneto-optic layer, and further anti- reflection layer(s). In the Faraday effect device shown, anti-reflection stacks 5, 7 and 8 are provided on either side of, and between, substrate 2 and magneto-optic layer 1. <IMAGE>
GB7837896A 1977-10-04 1978-09-23 Magneto-optical phase modulatiing devices Expired GB2006456B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7837896A GB2006456B (en) 1977-10-04 1978-09-23 Magneto-optical phase modulatiing devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4115177 1977-10-04
GB7837896A GB2006456B (en) 1977-10-04 1978-09-23 Magneto-optical phase modulatiing devices

Publications (2)

Publication Number Publication Date
GB2006456A true GB2006456A (en) 1979-05-02
GB2006456B GB2006456B (en) 1983-06-02

Family

ID=26264608

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7837896A Expired GB2006456B (en) 1977-10-04 1978-09-23 Magneto-optical phase modulatiing devices

Country Status (1)

Country Link
GB (1) GB2006456B (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426273A1 (en) * 1978-05-15 1979-12-14 Sperry Rand Corp MAGNETO-OPTICAL EFFECT MIRROR INTRODUCING A NON-RECIPROCAL PHASING
EP0039180A2 (en) * 1980-04-29 1981-11-04 British Aerospace Public Limited Company Magneto-optical phase-modulating devices
FR2504320A1 (en) * 1981-04-21 1982-10-22 Deutsche Forsch Luft Raumfahrt RING LASER
GB2130365A (en) * 1982-11-01 1984-05-31 Hitachi Ltd Optical magnetic-field measuring apparatus
EP0187400A1 (en) * 1984-12-17 1986-07-16 Koninklijke Philips Electronics N.V. Multilayer optical component
EP0320102A1 (en) * 1987-12-10 1989-06-14 British Aerospace Public Limited Company Ring laser gyroscopes
US4900137A (en) * 1986-09-06 1990-02-13 British Aerospace Public Limited Company Mirrors
FR2636133A1 (en) * 1988-09-02 1990-03-09 Northrop Corp LASER GYROSCOPE IN RING AND MAGNETIC MIRROR FOR THIS GYROSCOPE
GB2276488A (en) * 1993-02-23 1994-09-28 Peter Charles Somervill Laurie A device for deriving an oscillating force

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2426273A1 (en) * 1978-05-15 1979-12-14 Sperry Rand Corp MAGNETO-OPTICAL EFFECT MIRROR INTRODUCING A NON-RECIPROCAL PHASING
EP0039180A2 (en) * 1980-04-29 1981-11-04 British Aerospace Public Limited Company Magneto-optical phase-modulating devices
EP0039180A3 (en) * 1980-04-29 1982-04-07 British Aerospace Public Limited Company Magneto-optical phase-modulating devices
FR2504320A1 (en) * 1981-04-21 1982-10-22 Deutsche Forsch Luft Raumfahrt RING LASER
GB2130365A (en) * 1982-11-01 1984-05-31 Hitachi Ltd Optical magnetic-field measuring apparatus
EP0187400A1 (en) * 1984-12-17 1986-07-16 Koninklijke Philips Electronics N.V. Multilayer optical component
US4900137A (en) * 1986-09-06 1990-02-13 British Aerospace Public Limited Company Mirrors
EP0320102A1 (en) * 1987-12-10 1989-06-14 British Aerospace Public Limited Company Ring laser gyroscopes
US5394241A (en) * 1987-12-10 1995-02-28 British Aerospace Public Limited Company Multiple axis ring laser gyroscope with longitudinal excitation
FR2636133A1 (en) * 1988-09-02 1990-03-09 Northrop Corp LASER GYROSCOPE IN RING AND MAGNETIC MIRROR FOR THIS GYROSCOPE
GB2276488A (en) * 1993-02-23 1994-09-28 Peter Charles Somervill Laurie A device for deriving an oscillating force

Also Published As

Publication number Publication date
GB2006456B (en) 1983-06-02

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920923

728C Application made for restoration (sect. 28/1977)
728A Order made restoring the patent (sect. 28/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19950923