GB1284711A - Improvements in or relating to light modulation techiniques - Google Patents

Improvements in or relating to light modulation techiniques

Info

Publication number
GB1284711A
GB1284711A GB1335268A GB1335268A GB1284711A GB 1284711 A GB1284711 A GB 1284711A GB 1335268 A GB1335268 A GB 1335268A GB 1335268 A GB1335268 A GB 1335268A GB 1284711 A GB1284711 A GB 1284711A
Authority
GB
United Kingdom
Prior art keywords
layer
controllable
light
refractive index
transmissive
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
GB1335268A
Inventor
John Marshall Free
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.)
Hawker Siddeley Dynamics Ltd
Original Assignee
Hawker Siddeley Dynamics 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 Hawker Siddeley Dynamics Ltd filed Critical Hawker Siddeley Dynamics Ltd
Priority to GB1335268A priority Critical patent/GB1284711A/en
Priority to DE19691935881 priority patent/DE1935881A1/en
Priority to FR6924518A priority patent/FR2013275A1/fr
Publication of GB1284711A publication Critical patent/GB1284711A/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 
    • G02F1/21—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  by interference
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G02B5/23—Photochromic filters
    • 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 
    • G02F1/0126—Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass
    • 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 
    • G02F1/0147—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 thermo-optic effects

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)

Abstract

1284711 Modulating light HAWKER SIDDELEY DYNAMICS Ltd 2 July 1969 [19 July 1968] 13352/68 Heading H4F [Also in Division C4] In a light modulator composed of multiple layers of differing refractive index in a periodic structure, e.g. a multi-layer mirror, a wave filter, a set of interference fringes recorded in photographic or photochromic material, and wherein at least one controllable layer is of photochromic, bleachable, or tenebrescent material, or has a controllable refractive index, changes in the reflective and transmissive characteristics of the structure due to changes in the controllable layer are enhanced in narrow waveband regions as compared with the case wherein the material of the controllable layer is used in a non-periodic structure, or as a bulk element. Besides enhancing the properties of the layer, the structure is useful (a) as having a cut off frequency which is variable by control of the refractive index of the layer, e.g. by radiation, mechanical stress, or temperature (b) as a transmit/receive switch for a wave source, such as a magnetron: by virtue of the delay in the response of the controllable layer, the structure may be transmissive at the onset of irradiation, and thereafter become 100% reflective, whereby a radiation pulse only is transmitted (c) to change the colour of light by employing the absorption to modify the passbands of the periodic structure, even if the wavelengths involved are remote from those relevant to the normal characteristics of the controllable layer (d) for shifting the effective absorption frequencies of photochromic materials (see (c) above). In use, the incident light may meet the Brewster angle condition at an interface between two layers, or may undergo total internal reflection thereat. In a first preferred embodiment the structure is variably transmissive/reflective for light of wavelength # 1 and includes a layer controllable by light of wavelength # 2 which may carry an image and be variable with time. In a second embodiment the controllable layer of thickness (n/2) # 1 , where n is integral, is sandwiched between two multi-layer mirrors which per se are each highly reflective at # 1 , but so that the whole structure is 100% transmissive at # 1 . A change in the refractive index or absorption of the controllable layer by irradiation with light # 2 reduces the transmission and increases reflection by the structure.
GB1335268A 1968-07-19 1968-07-19 Improvements in or relating to light modulation techiniques Expired GB1284711A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1335268A GB1284711A (en) 1968-07-19 1968-07-19 Improvements in or relating to light modulation techiniques
DE19691935881 DE1935881A1 (en) 1968-07-19 1969-07-15 Light modulating device
FR6924518A FR2013275A1 (en) 1968-07-19 1969-07-18

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1335268A GB1284711A (en) 1968-07-19 1968-07-19 Improvements in or relating to light modulation techiniques

Publications (1)

Publication Number Publication Date
GB1284711A true GB1284711A (en) 1972-08-09

Family

ID=10021403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1335268A Expired GB1284711A (en) 1968-07-19 1968-07-19 Improvements in or relating to light modulation techiniques

Country Status (3)

Country Link
DE (1) DE1935881A1 (en)
FR (1) FR2013275A1 (en)
GB (1) GB1284711A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283115A (en) * 1978-06-28 1981-08-11 Richard Wolf Gmbh Beam splitters for endoscopes comprising a dual observation system
GB2472987A (en) * 2009-08-24 2011-03-02 Cambridge Entpr Ltd Composite optical materials, uses of composite optical materials and methods for the manufacture of composite optical materials
US9561615B2 (en) 2011-01-12 2017-02-07 Cambridge Enterprise Limited Manufacture of composite optical materials

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19831777A1 (en) 1998-07-15 2000-02-03 Norbert Hampp Light modulator with a photochromic layer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4283115A (en) * 1978-06-28 1981-08-11 Richard Wolf Gmbh Beam splitters for endoscopes comprising a dual observation system
GB2472987A (en) * 2009-08-24 2011-03-02 Cambridge Entpr Ltd Composite optical materials, uses of composite optical materials and methods for the manufacture of composite optical materials
US9561615B2 (en) 2011-01-12 2017-02-07 Cambridge Enterprise Limited Manufacture of composite optical materials

Also Published As

Publication number Publication date
FR2013275A1 (en) 1970-03-27
DE1935881A1 (en) 1970-01-22

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PLNP Patent lapsed through nonpayment of renewal fees