GB1248791A - Infra-red image converters - Google Patents

Infra-red image converters

Info

Publication number
GB1248791A
GB1248791A GB492768A GB492768A GB1248791A GB 1248791 A GB1248791 A GB 1248791A GB 492768 A GB492768 A GB 492768A GB 492768 A GB492768 A GB 492768A GB 1248791 A GB1248791 A GB 1248791A
Authority
GB
United Kingdom
Prior art keywords
radiation
infra
reflector
crystal
red
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
GB492768A
Inventor
John Edwin Midwinter
John Warner
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.)
UK Secretary of State for Defence
Original Assignee
UK Secretary of State for Defence
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 UK Secretary of State for Defence filed Critical UK Secretary of State for Defence
Priority to GB492768A priority Critical patent/GB1248791A/en
Publication of GB1248791A publication Critical patent/GB1248791A/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
    • G02F1/35—Non-linear optics
    • G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
    • G02F1/3534—Three-wave interaction, e.g. sum-difference frequency generation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/12—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification
    • 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
    • H01S3/0014—Monitoring arrangements not otherwise provided for
    • 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
    • H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
    • H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
    • H01S3/109—Frequency multiplication, e.g. harmonic generation

Abstract

1,248,791. Lasers. DEFENCE,SECRETARY OF. 30 Jan., 1969 [31 Jan., 1968], No. 4927/68. Heading H1C. [Also in Divisions G2-G3] An infra-red image converter comprises a uniaxial non-linear optical mixing crystal 7, e.g. of lithium niobate, located for irradiation with a plane wave of intense coherent radiation 17 from a laser 1 having a reflector 3 and a reflector 5, means for exposing crystal 7 to infrared radiation 15 transmitted through reflector 5, which infra-red radiation is of such frequency and direction that crystal 7 yields a sum frequency output of visible radiation 19 by a threewave phase matching process which has a variation of intensity with direction proportional to that of the infra-red radiation. The visible radiation 19 is observed by reflection from reflector 11 located at the Brewster angle for such radiation.
GB492768A 1968-01-31 1968-01-31 Infra-red image converters Expired GB1248791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB492768A GB1248791A (en) 1968-01-31 1968-01-31 Infra-red image converters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB492768A GB1248791A (en) 1968-01-31 1968-01-31 Infra-red image converters

Publications (1)

Publication Number Publication Date
GB1248791A true GB1248791A (en) 1971-10-06

Family

ID=9786485

Family Applications (1)

Application Number Title Priority Date Filing Date
GB492768A Expired GB1248791A (en) 1968-01-31 1968-01-31 Infra-red image converters

Country Status (1)

Country Link
GB (1) GB1248791A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2146406A3 (en) * 2008-07-18 2010-04-21 Danmarks Tekniske Universitet Optical arrangement and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2146406A3 (en) * 2008-07-18 2010-04-21 Danmarks Tekniske Universitet Optical arrangement and method
WO2010006985A3 (en) * 2008-07-18 2010-06-10 Danmarks Tekniske Universitet Optical arrangement and method
US8971361B2 (en) 2008-07-18 2015-03-03 Danmarks Tekniske Universitet Optical arrangement and method

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