GB823801A - Light modulation system - Google Patents
Light modulation systemInfo
- Publication number
- GB823801A GB823801A GB3381956A GB3381956A GB823801A GB 823801 A GB823801 A GB 823801A GB 3381956 A GB3381956 A GB 3381956A GB 3381956 A GB3381956 A GB 3381956A GB 823801 A GB823801 A GB 823801A
- Authority
- GB
- United Kingdom
- Prior art keywords
- medium
- light
- vibrations
- block
- regions
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/532—Polarisation modulation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/02—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the intensity of light
-
- 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
- G02F1/0128—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 electro-mechanical, magneto-mechanical, elasto-optic effects
- G02F1/0131—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 electro-mechanical, magneto-mechanical, elasto-optic effects based on photo-elastic effects, e.g. mechanically induced birefringence
-
- 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
- G02F1/11—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 acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Abstract
823,801. Polarizing apparatus. MUELLER, H., and RINES, R. H Nov. 6, 1956, No. 3819/56. Class 97(1) [Also in Group XL(b)] Vibrations set up in an optically inactive medium 13, such as a block of glass, a block of non-crystalline fused quartz, or a liquid, by means, such as a piezo-electric crystal vibrator assembly 15 in contact with the lower surface, render the medium birefringent whereby plane polarized light from a polarizer 7 impinging on one face '9 of the block, at right angles to the wave front of the vibrations, emerges from the other face 11 as elliptically polarized light and passes, in dependence upon the degree of ellipticity, through a second polarizer 25 crossed with the first. In accordance with the invention, vibrator 15 comprises a plurality of elements as shown in Fig. 6 with the axes of principal vibration substantially parallel to one another and normal to the surface of the medium. In the case of quartz crystal vibrators, the X or polar axes, along which maximum dimensional changes take place, are oriented normal to the surface of block 13. The Z- axes of adjacent crystals are disposed alternately orthogonally to one another so as to compensate for the effects of transverse vibration. The crystals may be metallized and soldered to a silver-chromium or copper layer 17 evaporated on to block 13. Reference is made to the use alternatively of magneto-strictive and magneto-active vibrators. The vibrations are produced at a high frequency, between several hundred kilocycles and ten megacycles are suggested, and may result in standing waves being set up in the medium. Reference is made however to arrangements in which the dimensions of the medium are not related to the wavelength of the vibration. The standing wave pattern may be displayed on a screen 27 and comprises bands of light 2 corresponding to the regions of compression and dilation which give rise to birefringence separated by dark bands 4 corresponding to the nodal regions. The bands are produced periodically at twice the frequency of the vibrations, each region changing back and forth between compression and dilution. The difference in the index of refraction along the vertical and horizontal polarization directions changes in sign from compression to dilation with the result that the direction of the resulting elliptical polarization also changes periodically. As an alternative to crossing polarizer 25 with 7, it may be oriented so as to pass light due to the nodal regions and suppress light due to the compressed and dilated regions. Reference is also .made to the use of circularly polarized light by the association of quarter-wave plates with polarizers 7 and 25. The vibrator is energized from an oscillator 21 and variation in the magnitude of transmitted light is effected by modulating the amplitude of the oscillations. A modulator in accordance with the invention may operate with visible, infra-red or ultraviolet light and may be applied to television image projection, a stroboscopic display arrangement, a single or multichannel system for communicating information over a light beam, Figs. 3 and 4 (not shown) and a secret communication system, Fig. 5 (not shown). Although the vibrations set up in the medium are principally in the vertical direction, transverse vibration does occur. By measuring the wavelength of the vertical and transverse wave patterns as projected on to a viewing screen Youngs modulus and Poisson's ratio for the medium may be determined.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE552939D BE552939A (en) | 1948-01-07 | ||
US1002A US2623165A (en) | 1948-01-07 | 1948-01-07 | Modulated light communication system |
US100360A US2707749A (en) | 1949-06-21 | 1949-06-21 | System of light beam communication |
GB3381956A GB823801A (en) | 1956-11-06 | 1956-11-06 | Light modulation system |
FR1165133D FR1165133A (en) | 1956-11-06 | 1956-11-23 | Light modulation device |
CH353457D CH353457A (en) | 1956-11-06 | 1956-11-26 | Light modulation device |
DEM32622A DE1119414B (en) | 1949-06-21 | 1956-12-12 | Light modulator or light shutter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3381956A GB823801A (en) | 1956-11-06 | 1956-11-06 | Light modulation system |
Publications (1)
Publication Number | Publication Date |
---|---|
GB823801A true GB823801A (en) | 1959-11-18 |
Family
ID=10357870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3381956A Expired GB823801A (en) | 1948-01-07 | 1956-11-06 | Light modulation system |
Country Status (3)
Country | Link |
---|---|
CH (1) | CH353457A (en) |
FR (1) | FR1165133A (en) |
GB (1) | GB823801A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006002765A1 (en) * | 2004-07-07 | 2006-01-12 | Merck Patent Gmbh | Biaxial film having local birefringence that varies periodically |
-
1956
- 1956-11-06 GB GB3381956A patent/GB823801A/en not_active Expired
- 1956-11-23 FR FR1165133D patent/FR1165133A/en not_active Expired
- 1956-11-26 CH CH353457D patent/CH353457A/en unknown
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006002765A1 (en) * | 2004-07-07 | 2006-01-12 | Merck Patent Gmbh | Biaxial film having local birefringence that varies periodically |
US7724330B2 (en) | 2004-07-07 | 2010-05-25 | Merck Patent Gmbh | Biaxial film having local birefringence that varies periodically |
Also Published As
Publication number | Publication date |
---|---|
CH353457A (en) | 1961-04-15 |
FR1165133A (en) | 1958-10-20 |
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