GB1368598A - Light beam polarization modulator - Google Patents

Light beam polarization modulator

Info

Publication number
GB1368598A
GB1368598A GB913974A GB913974A GB1368598A GB 1368598 A GB1368598 A GB 1368598A GB 913974 A GB913974 A GB 913974A GB 913974 A GB913974 A GB 913974A GB 1368598 A GB1368598 A GB 1368598A
Authority
GB
United Kingdom
Prior art keywords
crystals
degrees
crystal
birefringent
laser
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
GB913974A
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.)
CBS Corp
Original Assignee
Westinghouse Electric 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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1368598A publication Critical patent/GB1368598A/en
Expired legal-status Critical Current

Links

Classifications

    • 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 
    • G02F1/03—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 ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
    • G02F1/0305—Constructional arrangements
    • G02F1/0311—Structural association of optical elements, e.g. lenses, polarizers, phase plates, with the crystal
    • 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
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/115—Q-switching using intracavity electro-optic devices

Abstract

1368598 Modulating light WESTINGHOUSE ELECTRIC CORP 12 July 1971 [17 Aug 1970] 9139/74 Divided out of 1363885 Heading H4F [Also in Division H1] In the parent Specification 1,363,885 a birefringent crystal 2 divides an incident plane, circularly or elliptically polarized beam 1 into parallel E and O rays 8, 7, which are passed through respective birefringent crystals 11, 10, a #/2 plate 9 and are recombined by a birefringent crystal 3 complementary to crystal 2. Plate 9 serves to render the two path lengths equal so that the recombined beam 1<SP>1</SP> normally has the same polarization as beam 1. When an electric field is applied along the Z axis of at least one of the crystals 10, 11 (i.e. orthogonal to the optical path and at 0 or 90 degrees to the incident polarization vector) the optical path lengths become unequal due to the changes in refractive index and the polarization of beam 1<SP>1</SP> is altered. As particularly described in the parent, a beam 1 plane polarized at 45 degrees to the optic axes of crystal 2 may be switched to a beam 1<SP>1</SP> plane polarized at 135 degrees to the optic axes if crystals 10, 11, provide a #/2 path difference when actuated and passed or blocked by an analyser 12. In the parent Specification 1,363,585 is described a laser, Fig. 5, including a half mirror 17, active rod 16 and mirror 15, in which birefringent crystals 2, 10 and 11 act with the mirror 15 to provide an arrangement generally equivalent to that of Fig. 1, (plate 9 is absent), which may be used to Q switch the laser. If the laser rod 16 does not provide polarized light it is necessary to provide an analyser/polarizer 21. Since the light passes through crystals 10, 11 twice, the relative path difference per pass should only be 90 degrees.
GB913974A 1970-08-17 1971-07-12 Light beam polarization modulator Expired GB1368598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6438270A 1970-08-17 1970-08-17

Publications (1)

Publication Number Publication Date
GB1368598A true GB1368598A (en) 1974-10-02

Family

ID=22055563

Family Applications (2)

Application Number Title Priority Date Filing Date
GB913974A Expired GB1368598A (en) 1970-08-17 1971-07-12 Light beam polarization modulator
GB3252071A Expired GB1363885A (en) 1970-08-17 1971-07-12 Light beam polarization modulator

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB3252071A Expired GB1363885A (en) 1970-08-17 1971-07-12 Light beam polarization modulator

Country Status (3)

Country Link
US (1) US3684350A (en)
DE (1) DE2140440A1 (en)
GB (2) GB1368598A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2184251A (en) * 1985-12-13 1987-06-17 Stc Plc Optical state-of-polarisation modulator
GB2291978A (en) * 1994-08-04 1996-02-07 Rank Brimar Ltd Display system
US6276801B1 (en) 1994-08-04 2001-08-21 Digital Projection Limited Display system

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US4068190A (en) * 1976-02-09 1978-01-10 The United States Of America As Represented By The Secretary Of The Navy Laser system having frequency doubling
US4103260A (en) * 1977-01-03 1978-07-25 Hughes Aircraft Company Spatial polarization coding electro-optical transmitter
FR2452122A1 (en) * 1979-03-23 1980-10-17 Thomson Csf ADJUSTABLE OPTICAL ATTENUATOR DEVICE WITH ELECTRICAL CONTROL AND TAKING APPARATUS COMPRISING THIS DEVICE
US4272157A (en) * 1979-03-28 1981-06-09 The Ohio State University Multi-stable optical system
DE3013498A1 (en) * 1979-04-09 1980-10-30 Crosfield Business Mach OPTICAL MODULATOR AND LASER ENGRAVING DEVICE WITH SUCH A MODULATOR
JPS57100410A (en) * 1980-12-15 1982-06-22 Fujitsu Ltd Optical isolator
NL8104122A (en) * 1981-09-07 1983-04-05 Philips Nv OPTICAL SWITCH.
US4439014A (en) * 1981-11-13 1984-03-27 Mcdonnell Douglas Corporation Low voltage electro-optic modulator
US4483596A (en) * 1982-03-01 1984-11-20 Xerox Corporation Interface suppression apparatus and method for a linear modulator
US4461543A (en) * 1982-03-26 1984-07-24 Sperry Corporation Electro optic switch
US4511220A (en) * 1982-12-23 1985-04-16 The United States Of America As Represented By The Secretary Of The Air Force Laser target speckle eliminator
JP2572627B2 (en) * 1988-05-13 1997-01-16 ティーディーケイ株式会社 Optical isolator and optical circulator
US5251058A (en) * 1989-10-13 1993-10-05 Xerox Corporation Multiple beam exposure control
US5251057A (en) * 1989-10-13 1993-10-05 Xerox Corporation Multiple beam optical modulation system
US5305136A (en) * 1992-03-31 1994-04-19 Geo-Centers, Inc. Optically bidirectional fast optical switch having reduced light loss
US5978125A (en) 1995-11-30 1999-11-02 Yao; X. Steve Compact programmable photonic variable delay devices
US5963291A (en) * 1997-07-21 1999-10-05 Chorum Technologies Inc. Optical attenuator using polarization modulation and a feedback controller
US6137619A (en) * 1998-04-08 2000-10-24 Nz Applied Technologies, Incorporated High-speed electro-optic modulator
KR20010074479A (en) 1998-04-08 2001-08-04 추후제출 High-speed electro-optic modulator
US6026203A (en) * 1998-07-30 2000-02-15 Hewlett-Packard Company Polarization mixer based on walk-off crystals, half-wave plates and TEC fibers
GB9912072D0 (en) * 1999-05-24 1999-07-21 Eev Ltd Electro-optic devices
US6404537B1 (en) 2000-03-06 2002-06-11 Corning Applied Technologies Corporation Polarization transformer
WO2002044800A2 (en) * 2000-11-02 2002-06-06 Cambridge Research & Instrumentation, Inc. Folded liquid-crystal variable optical attenuator
US6389185B1 (en) * 2001-01-08 2002-05-14 Lockheed Martin Corporation Light polarization transformer
US7177491B2 (en) * 2001-01-12 2007-02-13 Board Of Regents The University Of Texas System Fiber-based optical low coherence tomography
EP1362252A4 (en) * 2001-01-12 2006-02-01 Univ Texas Method and apparatus for differential phase optical coherence tomography
US7034979B1 (en) 2001-11-09 2006-04-25 Ezconn Corporation Variable optical attenuator using crystal wedges
US7227686B1 (en) 2002-01-22 2007-06-05 General Photonics Corporation Tunable PMD emulators and compensators
US7154659B1 (en) * 2002-04-18 2006-12-26 General Photonics Corporation Optical depolarizers and DGD generators based on optical delay
US7541080B2 (en) * 2002-12-23 2009-06-02 Tama Plastic Industry Wrapping material with a Z-lock system
US7391977B2 (en) 2003-03-12 2008-06-24 General Photonics Corporation Monitoring mechanisms for optical systems
US7796894B1 (en) 2003-07-30 2010-09-14 General Photonics Corporation Reduction of noise and polarization mode dispersion (PMD) based on optical polarization stabilizer in fiber transmission
US7693419B1 (en) 2005-11-23 2010-04-06 General Photonics Corporation Optical spectrum analysis using optical interferometry
US8073326B2 (en) * 2006-12-06 2011-12-06 General Photonics Corporation Optical polarization division multiplexing in optical communication
US7723670B1 (en) 2007-03-26 2010-05-25 General Photonics Corporation Optical differential group delay module with folded optical path
US7952711B1 (en) 2007-03-26 2011-05-31 General Photonics Corporation Waveplate analyzer based on multiple tunable optical polarization rotators
US7945130B2 (en) * 2007-11-15 2011-05-17 General Photonics Corporation Mode scrambling apparatus for multimode fiber
US8422882B1 (en) 2008-02-04 2013-04-16 General Photonics Corporation Monitoring polarization-mode dispersion and signal-to-noise ratio in optical signals based on polarization analysis
US8345238B2 (en) * 2008-02-04 2013-01-01 General Photonics Corporation Measuring optical spectral property of light based on polarization analysis
US20100239245A1 (en) * 2009-03-21 2010-09-23 General Photonics Corporation Polarization Mode Emulators and Polarization Mode Dispersion Compensators Based on Optical Polarization Rotators with Discrete Polarization States
US8780433B2 (en) 2011-09-28 2014-07-15 General Photonics Corporation Polarization scrambling based on cascaded optical polarization devices having modulated optical retardation
CN103592784A (en) * 2013-11-28 2014-02-19 长春理工大学 Light intensity continuous adjustment device
US20180269645A1 (en) * 2016-02-29 2018-09-20 The Johns Hopkins University High energy fiber laser amplifier with reduced optical linewidth
CN116222632B (en) * 2023-05-10 2023-07-25 武汉中科锐择光电科技有限公司 Fiber sweep frequency interference device based on birefringent crystal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3429636A (en) * 1964-02-07 1969-02-25 Westinghouse Electric Corp Electro-optical light modulation means using birefringent crystals
US3391972A (en) * 1964-09-25 1968-07-09 Ibm Digital light deflector having equal path lengths for all possible paths
US3383460A (en) * 1965-08-25 1968-05-14 Rca Corp Light beam modulation and combination apparatus
US3497831A (en) * 1966-10-03 1970-02-24 Technical Operations Inc Broad-band electro-optic modulator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2184251A (en) * 1985-12-13 1987-06-17 Stc Plc Optical state-of-polarisation modulator
GB2184251B (en) * 1985-12-13 1990-02-07 Stc Plc Optical state of polarisation modulator
GB2291978A (en) * 1994-08-04 1996-02-07 Rank Brimar Ltd Display system
US6276801B1 (en) 1994-08-04 2001-08-21 Digital Projection Limited Display system
US6631993B2 (en) 1994-08-04 2003-10-14 Texas Instruments Incorporated Display system

Also Published As

Publication number Publication date
DE2140440A1 (en) 1972-02-24
US3684350A (en) 1972-08-15
GB1363885A (en) 1974-08-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee