GB1252276A - - Google Patents

Info

Publication number
GB1252276A
GB1252276A GB1252276DA GB1252276A GB 1252276 A GB1252276 A GB 1252276A GB 1252276D A GB1252276D A GB 1252276DA GB 1252276 A GB1252276 A GB 1252276A
Authority
GB
United Kingdom
Prior art keywords
optic
electro
wave plate
wave
light beam
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
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 filed Critical
Publication of GB1252276A publication Critical patent/GB1252276A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • G02F1/29—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 position or the direction of light beams, i.e. deflection
    • 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
    • G02F1/29—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 position or the direction of light beams, i.e. deflection
    • G02F1/31—Digital deflection, i.e. optical switching

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

1,252,276. Focal length modulator. THOMSON-CSF. 12 Nov., 1968 [22 Nov., 1967], No. 53704/68. Heading H4F. [Also in Division G2] Apparatus for varying the point of focus of a linearly polarized monochromatic light beam comprises a switchable electro-optic (KDP) half-wave plate and a birefringent lens (calcium carbonate crystal) the operative refractive index of which depending on the plane of polarization of the light output of the electro-optic half-wave plate. A plurality n of switchable electro-optic half-wave plate and birefringent lens assemblies may be arranged in series, and by selectively energizing the half-wave plates the light beam may be focused to 2<SP>n</SP> different points. If the voltages applied to the half-wave plates are not correct the light beam is elliptically polarized and all the light energy is not focused at the selected focal point. To avoid this drawback an additional switchable electro-optic half-wave plate followed by an analyser are disposed after the assemblies and for each optical power value selected (focal point) the number of half-wave plates excited is arranged to be either always even or always odd. The optical power valves may be positive, negative or neutral by utilizing a combination of convergent and divergent birefringent lenses. In a further embodiment a switchable electro-optic quarter-wave plate having a reflective surface which may constitute one of the electrodes is positioned adjacent a birefringent lens, the arrangement having two focal points. By varying the voltages applied to the electro-optic plates the arrangement may be used with monochromatic light of various wavelengths.
GB1252276D 1967-11-22 1968-11-12 Expired GB1252276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR129232 1967-11-22

Publications (1)

Publication Number Publication Date
GB1252276A true GB1252276A (en) 1971-11-03

Family

ID=8642097

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1252276D Expired GB1252276A (en) 1967-11-22 1968-11-12

Country Status (3)

Country Link
DE (1) DE1809898A1 (en)
FR (1) FR1552198A (en)
GB (1) GB1252276A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210629A1 (en) * 1981-03-24 1982-10-28 Canon K.K., Tokyo Lens having a variable focal length
GB2171535A (en) * 1985-01-09 1986-08-28 Canon Kk Variable focal-length lens system
US4783152A (en) * 1985-01-09 1988-11-08 Canon Kabushiki Kaisha Variable focal length lens
EP2515100A1 (en) * 2011-04-18 2012-10-24 General Electric Company Inspection device and method of inspecting a target
CN103033942A (en) * 2011-09-29 2013-04-10 通用电气公司 Optical imaging system and method and aperture diaphragm assembly and aperture element
US8672478B2 (en) 2009-12-10 2014-03-18 Essilor International (Compagnie Generale D'optique) Ophthalmic lens arrangement and an apparatus for demonstrating a plurality of optical functions and a method for demonstrating a plurality of optical functions

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4981342A (en) * 1987-09-24 1991-01-01 Allergan Inc. Multifocal birefringent lens system
JPH03194526A (en) * 1989-12-25 1991-08-26 Olympus Optical Co Ltd Real image type finder optical system

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3210629A1 (en) * 1981-03-24 1982-10-28 Canon K.K., Tokyo Lens having a variable focal length
GB2171535A (en) * 1985-01-09 1986-08-28 Canon Kk Variable focal-length lens system
US4783152A (en) * 1985-01-09 1988-11-08 Canon Kabushiki Kaisha Variable focal length lens
US8672478B2 (en) 2009-12-10 2014-03-18 Essilor International (Compagnie Generale D'optique) Ophthalmic lens arrangement and an apparatus for demonstrating a plurality of optical functions and a method for demonstrating a plurality of optical functions
EP2515100A1 (en) * 2011-04-18 2012-10-24 General Electric Company Inspection device and method of inspecting a target
CN102749332A (en) * 2011-04-18 2012-10-24 通用电气公司 Optical system, optical detector and detection method
US9188543B2 (en) 2011-04-18 2015-11-17 General Electric Company Inspection device and method thereof
CN103033942A (en) * 2011-09-29 2013-04-10 通用电气公司 Optical imaging system and method and aperture diaphragm assembly and aperture element
CN103033942B (en) * 2011-09-29 2015-07-15 通用电气公司 Optical imaging system and method and aperture diaphragm assembly and aperture element

Also Published As

Publication number Publication date
FR1552198A (en) 1969-01-03
DE1809898A1 (en) 1969-08-21

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees