GB844799A - Improvements in or relating to light controlling devices - Google Patents
Improvements in or relating to light controlling devicesInfo
- Publication number
- GB844799A GB844799A GB4438/58A GB443858A GB844799A GB 844799 A GB844799 A GB 844799A GB 4438/58 A GB4438/58 A GB 4438/58A GB 443858 A GB443858 A GB 443858A GB 844799 A GB844799 A GB 844799A
- Authority
- GB
- United Kingdom
- Prior art keywords
- iron
- yttrium
- oxide
- grms
- garnets
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2641—Compositions containing one or more ferrites of the group comprising rare earth metals and one or more ferrites of the group comprising alkali metals, alkaline earth metals or lead
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2675—Other ferrites containing rare earth metals, e.g. rare earth ferrite garnets
-
- 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
-
- 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
- G02F1/09—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 magneto-optical elements, e.g. exhibiting Faraday effect
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Power Engineering (AREA)
- Compounds Of Iron (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Ferrimagnetic materials of the general form A3B5O12, where A may be yttrium or any one of the rare earths of atomic number 62 to 71 inclusive, or mixtures of any one of these rare earths with each other or with yttrium and where B may be iron, or iron diluted with aluminium, gallium, scandium or chromium, or mixtures of these diluents with iron, are employed in a light modulator (see Group XL(b)) utilizing Faraday rotation of the plane of polarization. The materials which are structurally similar to Grossularite are referred to as garnets. Single crystals of yttrium-iron garnet are prepared by heating 100 grms of lead oxide, PbO, 70 grams of iron oxide Fe2 O3, and 3.5 grms of yttrium oxide Y2O3 for five hours at a temperature of 1325 DEG C. in an atmosphere of oxygen. Cooling is effected first to 900 DEG C. at the rate of 5 DEG C. per hour, and then to room temperature. The resultant mass comprises a lead oxide matrix from which crystalline phases of magneto plumbite and yttrium-iron garnet are separated by solution in 6N nitric acid to which the crystals are impervious. The yttrium-iron garnet is then separated by examination. It is stated that rare earth-iron garnets may be prepared in a similar manner.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US640481A US2974568A (en) | 1957-02-15 | 1957-02-15 | Light modulator |
Publications (1)
Publication Number | Publication Date |
---|---|
GB844799A true GB844799A (en) | 1960-08-17 |
Family
ID=24568430
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4438/58A Expired GB844799A (en) | 1957-02-15 | 1958-02-11 | Improvements in or relating to light controlling devices |
Country Status (4)
Country | Link |
---|---|
US (1) | US2974568A (en) |
FR (1) | FR1191330A (en) |
GB (1) | GB844799A (en) |
NL (1) | NL109103C (en) |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3153146A (en) * | 1959-06-19 | 1964-10-13 | Westinghouse Electric Corp | Thermal imaging device using a target which rotates the plane of polarization |
NL255137A (en) * | 1959-08-25 | |||
DE1120738B (en) * | 1960-02-09 | 1961-12-28 | Akad Wissenschaften Ddr | Polarizing microscope |
GB919368A (en) * | 1960-09-22 | 1963-02-27 | Nat Res Dev | Improvements relating to the measurement of distance |
NL276717A (en) * | 1961-07-28 | |||
US3177770A (en) * | 1961-10-17 | 1965-04-13 | J D Herrebaudt | Light modulation by microwaves |
US3239670A (en) * | 1961-11-17 | 1966-03-08 | Bloembergen Nicolaas | Microwave modulation of optical radiation in a waveguide |
US3234390A (en) * | 1962-01-12 | 1966-02-08 | J D Herrebaudt | Communication with light contrast modulation |
US3156651A (en) * | 1962-03-28 | 1964-11-10 | Bell Telephone Labor Inc | Light transparent ferrimagnetic garnets |
US3259015A (en) * | 1962-04-30 | 1966-07-05 | Bell Telephone Labor Inc | Multiple reflection optical wave modulator |
US3245314A (en) * | 1962-06-28 | 1966-04-12 | Bell Telephone Labor Inc | Optical rotation devices employing a ferromagnetic chromium trihalide |
US3204104A (en) * | 1962-07-02 | 1965-08-31 | Gen Telephone & Elect | Single-sideband light modulator |
US3324393A (en) * | 1963-07-26 | 1967-06-06 | Gen Electric | Magneto-optical electric current sensing arrangement |
US3316050A (en) * | 1963-08-09 | 1967-04-25 | Bell Telephone Labor Inc | Optical modulator employing the dichroic absorption of antiferromagnetic nif2 |
US3492061A (en) * | 1965-06-18 | 1970-01-27 | Bell Telephone Labor Inc | Light beam deflector in which the light is diffracted by magnetic waves |
US3526850A (en) * | 1966-03-23 | 1970-09-01 | Bell Telephone Labor Inc | Solid state laser |
US3512867A (en) * | 1967-05-18 | 1970-05-19 | Philips Corp | Magneto-optical digital light deflection device |
GB1310233A (en) * | 1969-04-11 | 1973-03-14 | Bp Chem Int Ltd | Radiation analysers |
JP2000171767A (en) * | 1998-12-07 | 2000-06-23 | Murata Mfg Co Ltd | Optical modulation device and filter device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2675740A (en) * | 1954-04-20 | Glare preventing device and method | ||
US581815A (en) * | 1897-05-04 | eaton | ||
US2109540A (en) * | 1931-06-06 | 1938-03-01 | Le Roy J Leishman | Means and method of coloring lightformed images |
US2451732A (en) * | 1944-06-15 | 1948-10-19 | Rca Corp | Microwave-absorptive gas light valve |
-
1957
- 1957-02-15 US US640481A patent/US2974568A/en not_active Expired - Lifetime
- 1957-12-13 FR FR1191330D patent/FR1191330A/en not_active Expired
-
1958
- 1958-01-14 NL NL224012A patent/NL109103C/xx active
- 1958-02-11 GB GB4438/58A patent/GB844799A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1191330A (en) | 1959-10-19 |
NL109103C (en) | 1964-08-17 |
US2974568A (en) | 1961-03-14 |
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