GB1219267A - Magneto-optic body - Google Patents

Magneto-optic body

Info

Publication number
GB1219267A
GB1219267A GB2585367A GB2585367A GB1219267A GB 1219267 A GB1219267 A GB 1219267A GB 2585367 A GB2585367 A GB 2585367A GB 2585367 A GB2585367 A GB 2585367A GB 1219267 A GB1219267 A GB 1219267A
Authority
GB
United Kingdom
Prior art keywords
yig
substituted
crystal
yttrium
lies
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
GB2585367A
Inventor
Roger William Cooper
Ronald Ferguson Pearson
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.)
Philips Components Ltd
Original Assignee
Mullard 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 Mullard Ltd filed Critical Mullard Ltd
Priority to GB2585367A priority Critical patent/GB1219267A/en
Publication of GB1219267A publication Critical patent/GB1219267A/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
    • G02F1/0009—Materials therefor
    • G02F1/0036—Magneto-optical materials

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thin Magnetic Films (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

1,219,267. Light modulators. MULLARD Ltd. 21 May, 1968 [5 June, 1967], No. 25853/67. Heading H4F. [Also in Division H1] A light modulation system comprises a Faraday effect element in the form of a single crystal of YIG in which at least some of the yttrium or iron is substituted by another element to improve the Figure or Merit (ratio of the Faraday rotation per cm. at saturation to the Saturation magnetization) as compared to YIG itself. For optimum operation the crystal should have a low saturation magnetization, a high specific Faraday rotation, and for broad band operation the effect should be linear over a high proportion of the band of transparency (e.g. between 1À2 and 4À5 microns). The crystal may comprise Y 3 Fe 5-x Ga x-y Al y O 12 wherein x lies between 0À9 and 1À5, preferably 1À2, and 0 # y# x. 0À005 to 0À02 atoms of silicon may also be substituted for some of the Ga and/or Al in the above formula. Indium (In) or Scandium (Sc) may be substituted for some of the iron in YIG at x values from 0À6 to 0À8 for broad-band operation. Europium (Eu) or terbium (Tb) may be substituted for all of the yttrium in YIG. With all the yttrium replaced by Tb or Eu, and also some of the iron replaced by gallium and/or aluminium, good materials as regards both Figure or Merit and shorter wavelength transparency are obtained. In particular, Eu 3 Fe 5 _ X Ga x O 12 where x lies between 0À2 and 0.8, or Tb 3 Fe 5-x Ga x O 12 , where x lies between 0À05 and 0À5, are good Faraday rotators (Aluminium may be interchanged in part or in full for the Gallium). Specific crystals referred to are Y 3 Fe 3 . 85 Ga 1 . 15 O 12 (disc-shaped crystal), and Y 8 Sc 0 . 7 Fe 4 . 3 0 12 .
GB2585367A 1967-06-05 1967-06-05 Magneto-optic body Expired GB1219267A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2585367A GB1219267A (en) 1967-06-05 1967-06-05 Magneto-optic body

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2585367A GB1219267A (en) 1967-06-05 1967-06-05 Magneto-optic body

Publications (1)

Publication Number Publication Date
GB1219267A true GB1219267A (en) 1971-01-13

Family

ID=10234397

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2585367A Expired GB1219267A (en) 1967-06-05 1967-06-05 Magneto-optic body

Country Status (1)

Country Link
GB (1) GB1219267A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2549246A1 (en) * 1983-07-15 1985-01-18 Nippon Telegraph & Telephone OPTICAL ISOLATOR

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2549246A1 (en) * 1983-07-15 1985-01-18 Nippon Telegraph & Telephone OPTICAL ISOLATOR

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