GB1406730A - Ring lasers - Google Patents

Ring lasers

Info

Publication number
GB1406730A
GB1406730A GB5901373A GB5901373A GB1406730A GB 1406730 A GB1406730 A GB 1406730A GB 5901373 A GB5901373 A GB 5901373A GB 5901373 A GB5901373 A GB 5901373A GB 1406730 A GB1406730 A GB 1406730A
Authority
GB
United Kingdom
Prior art keywords
magnetic
light beams
film
refractive index
bias
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.)
Expired
Application number
GB5901373A
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.)
Sperry Corp
Original Assignee
Sperry Rand Corp
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 Corp filed Critical Sperry Rand Corp
Priority to GB5901373A priority Critical patent/GB1406730A/en
Publication of GB1406730A publication Critical patent/GB1406730A/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
    • 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
    • H01S3/08059—Constructional details of the reflector, e.g. shape
    • 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
    • H01S3/08054—Passive cavity elements acting on the polarization, e.g. a polarizer for branching or walk-off compensation

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Plasma & Fusion (AREA)
  • Lasers (AREA)

Abstract

1406730 Lasers SPERRY RAND CORP 20 Dec 1973 59013/73 Heading H1C A magnetic bias resonator mirror used to prevent locking of the two counterrotating light beams in a ring laser comprises a substrate 23, Fig. 4, coated with a film of magnetic material 24, which in turn is coated with dielectric layers 25a-25f of alternately high and low refractive index, the magnetic layer imparting a differential phase shift to light beams proceeding in opposite directions along an offnormal reflective path, and the dielectric layer adjacent the magnetic film being of such thickness that the differential reflectivity of the oppositely-directed light beams is substantially cancelled. The substrate may be quartz, glass or aluminium supporting a magnetic film of either high or low remanance, continuous magnetization being provided in the latter case. Bias reversal of a high remanance film may be effected by an adjacent magnet. The dielectric layers of high refractive index may be formed from zinc sulphide, germanium or silver chloride, while the low refractive index layers may consist of cryolite, magnesium fluoride or calcium fluoride. A conventional ring laser incorporating the magnetic bias mirror is described, polarization of the counterrotating light beams being effected by Brewster windows terminating the lasing source.
GB5901373A 1973-12-20 1973-12-20 Ring lasers Expired GB1406730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5901373A GB1406730A (en) 1973-12-20 1973-12-20 Ring lasers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5901373A GB1406730A (en) 1973-12-20 1973-12-20 Ring lasers

Publications (1)

Publication Number Publication Date
GB1406730A true GB1406730A (en) 1975-09-17

Family

ID=10482892

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5901373A Expired GB1406730A (en) 1973-12-20 1973-12-20 Ring lasers

Country Status (1)

Country Link
GB (1) GB1406730A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2843327A1 (en) * 1977-10-04 1979-04-12 Sperry Rand Ltd MAGNETO-OPTICAL PHASE MODULATION DEVICE
FR2478319A1 (en) * 1980-03-14 1981-09-18 Deutsche Forsch Luft Raumfahrt LASER ROTATION SPEED SENSOR IN RING
EP0039180A2 (en) * 1980-04-29 1981-11-04 British Aerospace Public Limited Company Magneto-optical phase-modulating devices
US4519708A (en) * 1981-05-20 1985-05-28 Raytheon Company Mode discrimination apparatus
GB2254481A (en) * 1991-02-05 1992-10-07 Northrop Corp Ring laser gyro having two magnetic mirrors
CN113534300A (en) * 2021-08-26 2021-10-22 湖北科技学院 anti-PT symmetrical photon multilayer capable of realizing directional regulation and control of reflectivity

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2843327A1 (en) * 1977-10-04 1979-04-12 Sperry Rand Ltd MAGNETO-OPTICAL PHASE MODULATION DEVICE
JPS5461552A (en) * 1977-10-04 1979-05-17 Sperry Rand Ltd Magnetoooptical phase modulator
JPH0514251B2 (en) * 1977-10-04 1993-02-24 British Aerospace
FR2478319A1 (en) * 1980-03-14 1981-09-18 Deutsche Forsch Luft Raumfahrt LASER ROTATION SPEED SENSOR IN RING
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
US4519708A (en) * 1981-05-20 1985-05-28 Raytheon Company Mode discrimination apparatus
GB2254481A (en) * 1991-02-05 1992-10-07 Northrop Corp Ring laser gyro having two magnetic mirrors
CN113534300A (en) * 2021-08-26 2021-10-22 湖北科技学院 anti-PT symmetrical photon multilayer capable of realizing directional regulation and control of reflectivity

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Legal Events

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