GB2012101A - Laser gyroscope - Google Patents

Laser gyroscope

Info

Publication number
GB2012101A
GB2012101A GB7849292A GB7849292A GB2012101A GB 2012101 A GB2012101 A GB 2012101A GB 7849292 A GB7849292 A GB 7849292A GB 7849292 A GB7849292 A GB 7849292A GB 2012101 A GB2012101 A GB 2012101A
Authority
GB
United Kingdom
Prior art keywords
passages
frequency
faraday rotator
path
waves
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
GB7849292A
Other versions
GB2012101B (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.)
Raytheon Co
Original Assignee
Raytheon Co
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 Raytheon Co filed Critical Raytheon Co
Publication of GB2012101A publication Critical patent/GB2012101A/en
Application granted granted Critical
Publication of GB2012101B publication Critical patent/GB2012101B/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
    • G01C19/667—Ring laser gyrometers using a multioscillator ring laser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08—Construction or shape of optical resonators or components thereof
    • H01S3/081—Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083—Ring lasers

Abstract

A four-frequency laser gyroscope utilizes a four-segment nonplanar propagation path 108, 110, 112, 114 to provide a first frequency splitting by supporting waves with different resonant frequencies for opposite senses of circular polarization. The path is through passages in a single solid block 102 of low thermal coefficient of expansion material. The passages intersect at surfaces of the block whereat mirrors are positioned. A second frequency splitting is provided by a Faraday rotator 156 having a thin plate of rare earth-doped glass with a high Verdet constant positioned within an aperture in a permanent magnet. Electrodes excite laser action in a gas in the passages to establish the waves. A narrow angle of incidence is provided for the beams incident upon the output mirror on face 122 to prevent cross coupling between beams within the output optics structure. The Faraday rotator plate blocks the gaseous flow path and reduces output frequency drift caused by contaminating particles. <IMAGE>
GB7849292A 1978-01-03 1978-12-20 Laser gyroscope Expired GB2012101B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86809678A 1978-01-03 1978-01-03

Publications (2)

Publication Number Publication Date
GB2012101A true GB2012101A (en) 1979-07-18
GB2012101B GB2012101B (en) 1982-04-21

Family

ID=25351066

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7849292A Expired GB2012101B (en) 1978-01-03 1978-12-20 Laser gyroscope

Country Status (7)

Country Link
JP (1) JPS5498195A (en)
CA (1) CA1116279A (en)
DE (1) DE2900125A1 (en)
FR (1) FR2413635A1 (en)
GB (1) GB2012101B (en)
IT (1) IT1113711B (en)
NL (1) NL189980C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138625A (en) * 1983-04-20 1984-10-24 Litton Systems Inc Ring laser rotational rate sensor
GB2184285A (en) * 1983-11-07 1987-06-17 Raytheon Co Ring laser gyroscope

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2471583A1 (en) * 1979-12-14 1981-06-19 Thomson Csf METHOD AND DEVICE FOR MODULATING THE WAVE PHASE CIRCULATING IN A RING INTERFEROMETER
CA1189600A (en) * 1980-10-17 1985-06-25 Raytheon Company Dispersion equalized ring laser gyroscope
US4397027A (en) * 1981-01-05 1983-08-02 Raytheon Company Self-compensating gas discharge path for laser gyro
GB2120839A (en) * 1982-05-19 1983-12-07 Raytheon Co Ring laser gyroscope
JPS6068684A (en) * 1983-09-26 1985-04-19 Fujitsu Ltd Laser light source
US4578793A (en) * 1984-07-13 1986-03-25 The Board Of Trustees Of The Leland Stanford Junior University Solid-state non-planar internally reflecting ring laser
US4962506A (en) * 1988-04-14 1990-10-09 Litton Systems, Inc. Scatter symmetrization in multi-mode ring laser gyros
US5469256A (en) * 1988-07-29 1995-11-21 Litton Systems, Inc. Multipole magnetic geometry for a ring laser gyroscope

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245314A (en) * 1962-06-28 1966-04-12 Bell Telephone Labor Inc Optical rotation devices employing a ferromagnetic chromium trihalide
US3373650A (en) * 1965-04-02 1968-03-19 Honeywell Inc Laser angular rate sensor
US3741657A (en) * 1971-03-03 1973-06-26 Raytheon Co Laser gyroscope
JPS5045904Y2 (en) * 1972-06-07 1975-12-25
DE2335597A1 (en) * 1972-07-17 1974-01-31 North American Rockwell RING LASER GYROSCOPE
JPS4940557A (en) * 1972-08-16 1974-04-16
US3841758A (en) * 1972-09-28 1974-10-15 J Gievers Rotation sensitive retarder
JPS5146340B2 (en) * 1972-12-12 1976-12-08
DE2432479C2 (en) * 1974-07-04 1985-05-30 Sperry Corp., New York, N.Y. Ring laser
JPS5349629Y2 (en) * 1974-10-02 1978-11-29
CA1077602A (en) * 1976-01-02 1980-05-13 Raytheon Company Electromagnetic wave ring resonator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138625A (en) * 1983-04-20 1984-10-24 Litton Systems Inc Ring laser rotational rate sensor
GB2184285A (en) * 1983-11-07 1987-06-17 Raytheon Co Ring laser gyroscope
GB2184285B (en) * 1983-11-07 1990-08-01 Raytheon Co Ring laser gyroscope

Also Published As

Publication number Publication date
FR2413635A1 (en) 1979-07-27
NL7812668A (en) 1979-07-05
JPS5498195A (en) 1979-08-02
CA1116279A (en) 1982-01-12
DE2900125C2 (en) 1993-04-01
NL189980C (en) 1993-09-16
FR2413635B1 (en) 1984-09-14
GB2012101B (en) 1982-04-21
DE2900125A1 (en) 1979-07-12
IT1113711B (en) 1986-01-20
NL189980B (en) 1993-04-16
JPH0321889B2 (en) 1991-03-25
IT7947511A0 (en) 1979-01-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19961220