CN204065597U - A kind of vector light beam modulating system based on magneto-optic effect - Google Patents
A kind of vector light beam modulating system based on magneto-optic effect Download PDFInfo
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- CN204065597U CN204065597U CN201420565646.XU CN201420565646U CN204065597U CN 204065597 U CN204065597 U CN 204065597U CN 201420565646 U CN201420565646 U CN 201420565646U CN 204065597 U CN204065597 U CN 204065597U
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Abstract
The utility model is a kind of vector light beam modulating system based on magneto-optic effect, comprise laser instrument, spatial light modulator, first confocal lens, circular hole diaphragm, second confocal lens, phase-type Ronchi grating, magneto-optic effect device, incident beam is formed after the laser that wherein laser instrument sends collimates after beam expanding lens, incident beam incides spatial light modulator, after the first confocal lens, level is selected through circular hole diaphragm, two bundle circularly polarized lights that are left-handed and dextrorotation are formed again through two wave plates, two bundle circularly polarized lights are by the second confocal lens focus, radial vector light beam is formed again through phase-type Ronchi grating, radial vector light beam can form the vector light beam of other types by magneto-optic effect device.The utility model only just can need be modulated the polarization direction of the vector light beam of incidence by regulating the radio-frequency coil electric current of magneto-optic effect device, thus changes between vector light beam, and reliability is high, it is simple and easy to operate, translation type is many.
Description
Technical field
The utility model is a kind of vector light beam modulating system based on magneto-optic effect, particularly relates to the spatial modulation system of vector light beam, based on the innovative technology of the vector light beam modulating system of magneto-optic effect.
Background technology
The spatial polarization of vector light beam (VPB) distributes the special nature caused, and itself and linearly polarized light, circularly polarized light is had many different significantly, causes the extensive concern of researchist in the industry.Vector light beam is widely used at multiple fields, such as, guide and catch particle, particle accelerates, improves the aspects such as microscopical resolution, Metal Cutting, raising storage density and surface plasma body resonant vibration (SPR).That is familiar with vector light beam along with people deepens continuously, and it will be used widely in increasing field.Up to now, the experimental technique producing vector light beam has a variety of, and existing more ripe instrument, these instruments directly can only produce single vector light beam usually, as radial vector light beam or angle vector light beam.In development test, realize mutually changing radial vector light beam and angle vector light beam frequently by adding two half-wave plates.
But, this conversion method is also inconvenient, because utilize the conversion that half-wave plate can only carry out between radial vector light beam and angle vector light beam, when researchist needs the vector light beam using other types, just must redesign experiment light path to produce required vector light beam, and known vector light beam cannot be made to change to the vector light beam of the other types that research institute needs by adjusting wave plate simply.
Utility model content
The utility model proposes a kind of vector light beam modulating system based on magneto-optic effect for above-mentioned shortcoming.The utility model is easy to adjust, simple to operate, the vector light beam of incidence can be converted to the vector light beam of other types, makes up in other conversion methods current and adopts wave plate as switching device, and can only convert the deficiency of single vector light beam to.
The technical solution of the utility model is: include laser instrument, spatial light modulator, first confocal lens, circular hole diaphragm, second confocal lens, phase-type Ronchi grating, magneto-optic effect device, incident beam is formed after the laser that wherein laser instrument sends collimates after beam expanding lens, incident beam incides spatial light modulator, after the first confocal lens, level is selected through circular hole diaphragm, two bundle circularly polarized lights that are left-handed and dextrorotation are formed again through two wave plates, two bundle circularly polarized lights are by the second confocal lens focus, radial vector light beam is formed again through phase-type Ronchi grating, radial vector light beam can form the vector light beam of other types by magneto-optic effect device.
The beneficial effects of the utility model are: the feature that the electrooptical effect that the utility model utilizes magneto-optic effect and electric field that crystal is produced is similar, and magnetic field also can make crystal produce the anisotropy of light.A phenomenon in magneto-optic effect is exactly Faraday effect, when light wave by magnet-optical medium, be parallel to magnetic direction propagate time, the plane of polarization of linearly polarized light rotates.And magneto-optic modulation utilization is exactly Faradic electricity magnetic rotation effect, change the polarization direction of incident light by controlling electric signal.Magneto-optic effect device is generally made up of magnet-optical medium (can be the materials such as diamond, quartz, dense flint glass), radio-frequency coil and modulation power source, when light is by magnet-optical medium, by controlling radio-frequency coil electric current, the magnetic field intensity changed in magnet-optical medium makes polarisation of light face rotate.The utility model magneto-optic effect device substitutes half-wave plate, converts the radial polarisation light of incident magneto-optic effect device to angle polarized light.By controlling, regulating the electric signal of input, can regulate arbitrarily the polarization direction of light beam, therefore magneto-optic effect device can also make incident radial polarisation light become broad sense rotational symmetry to vector light beam.The utility model is easy to adjust based on the vector light beam modulating system of magneto-optic effect, simple to operate, the vector light beam of incidence can be converted to the vector light beam of other types fairly simplely, making up in other conversion methods current adopts wave plate as switching device, and can only convert the deficiency of single vector light beam to.
Accompanying drawing explanation
Fig. 1 is the process flow diagram that the utility model realizes.
Fig. 2 is the index path that the utility model produces the radial vector light beam needed for experiment.
Fig. 3 is the schematic diagram that radial vector light beam is modulated polarization direction by magneto-optic effect device.
Specific implementation
Below in conjunction with accompanying drawing of the present utility model; technical scheme in the utility model embodiment is clearly and completely described; those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is the process flow diagram that a kind of vector light beam modulating system based on magneto-optic effect of the utility model realizes.Laser is by producing radial vector light beam after 4f optical system, this radial vector light beam incides magneto-optic effect device, by regulating the radio-frequency coil electric current of magneto-optic effect device, axial signal magnetic field intensity can be changed, thus change the polarization direction of radial vector light beam, produce the vector light beam of angle vector light beam or other types.
Fig. 2 is the index path that the utility model produces the radial vector light beam needed for experiment, include laser instrument, spatial light modulator, first confocal lens, circular hole diaphragm, second confocal lens, phase-type Ronchi grating, magneto-optic effect device, incident beam is formed after the laser that wherein laser instrument sends collimates after beam expanding lens, incident beam incides spatial light modulator, after the first confocal lens, level is selected through circular hole diaphragm, two bundle circularly polarized lights that are left-handed and dextrorotation are formed again through two wave plates, two bundle circularly polarized lights are by the second confocal lens focus, radial vector light beam is formed again through phase-type Ronchi grating, radial vector light beam can form the vector light beam of other types by magneto-optic effect device.
Above-mentioned laser instrument is helium-neon laser.
The wavelength of above-mentioned helium-neon laser is 632.8nm.
Above-mentioned spatial light modulator is the spatial light modulator being loaded with hologram.
Above-mentioned spatial light modulator is transmissive spatial light modulator.
Above-mentioned two wave plates are two quarter-wave plates or 1/2nd wave plates.
The helium-neon laser of above-mentioned wavelength 632.8nm sends laser after then beam expanding lens collimates, forms incident beam 1, incide the spatial light modulator 2 being loaded with hologram, after the first confocal lens 3, level is selected through circular hole diaphragm 4, form left-handed and dextrorotation two through two quarter-wave plates or 1/2nd wave plates again and restraint circularly polarized light, then focused on by the second confocal lens 5, then radial vector light beam 7 is formed through phase-type Ronchi grating 6, finally when radial vector light beam is by magneto-optic effect device 8, light incides in the magnet-optical medium in magneto-optic effect device 8, Fig. 3 is the schematic diagram that radial vector light beam is modulated polarization direction by magneto-optic effect device, magneto-optic effect device modulates according to the polarization direction of following formula to polarized light:
θ＝KHL
Wherein, θ represents that plane of polarization have rotated θ angle, and H is the magnetic field intensity that electric current causes, and L represents the length of magnet-optical medium, and K is Verdet constant, is a constant to certain wavelength, and the K value of different materials is different.
The step that vector light beam modulating system based on magneto-optic effect of the present utility model realizes is as follows: laser beam incides by spatial light modulator, first confocal lens, circular hole diaphragm, second confocal lens, radial vector light beam is produced after the 4f optical system of phase-type Ronchi grating composition, then the incident magneto-optic effect device 8 of this light beam, by controlling the radio-frequency coil electric current on the magnet-optical medium surface be wrapped in set by magneto-optic effect device 8, change axial signal magnetic field intensity H, relation according to above-mentioned polarisation of light face anglec of rotation θ and magnet-optical medium length L and magnetic field intensity H thereof: θ=KHL, regulate the radio-frequency coil electric current of magneto-optic effect device, change axial signal magnetic field intensity, thus change the polarization direction of light beam, when θ=pi/2 (being make the plane of polarization of incident radial vector light beam rotate pi/2), form angle vector light beam, when 0< θ < pi/2 (being when making the plane of polarization of incident radial vector light beam rotate to be other angles), form the rotational symmetry of broad sense to vector light beam.
Below that theoretical modeling calculates the formula needing to use:
1, broad sense rotational symmetry is to the expression formula of vector light beam light field:
Wherein
represent radial direction unit vector,
represent angle unit vector.On beam cross-section, the angle that the vector every bit of specific position departs from radial directions is θ.
2, the expression formula of radial vector light beam light field:
Wherein
represent radial direction unit vector,
represent angle unit vector, θ equals 0 °.
3, the expression formula of angle vector light beam light field:
Wherein
represent radial direction unit vector,
represent angle unit vector, θ equals pi/2.
According to the principle of magneto-optic effect device, can calculate that bright dipping is through device, the transformational relation between radial vector light beam and angle vector light beam light field:
When incident ray is radial vector light beam, in order to be converted to angle vector light beam, then magneto-optic effect device need make incident beam plane of polarization rotate pi/2, namely
In order to verify from magneto-optic effect device only no and theory deduction out angle vector light beam out or broad sense rotational symmetry consistent to vector light beam, a polaroid can be added after device, because different vector beam is different by the hot spot that this polaroid produces, therefore, by analyzing the hot spot figure of vector light beam after polaroid, can pick out from the light beam of magneto-optic effect device outgoing is the vector light beam of what type.
Claims (6)
1. the vector light beam modulating system based on magneto-optic effect, it is characterized in that including laser instrument, spatial light modulator, first confocal lens, circular hole diaphragm, second confocal lens, phase-type Ronchi grating, magneto-optic effect device, incident beam is formed after the laser that wherein laser instrument sends collimates after beam expanding lens, incident beam incides spatial light modulator, after the first confocal lens, level is selected through circular hole diaphragm, two bundle circularly polarized lights that are left-handed and dextrorotation are formed again through two wave plates, two bundle circularly polarized lights are by the second confocal lens focus, radial vector light beam is formed again through phase-type Ronchi grating, radial vector light beam can form the vector light beam of other types by magneto-optic effect device.
2. the vector light beam modulating system based on magneto-optic effect according to claim 1, is characterized in that above-mentioned laser instrument is helium-neon laser.
3. the vector light beam modulating system based on magneto-optic effect according to claim 2, is characterized in that the wavelength of above-mentioned helium-neon laser is 632.8nm.
4. the vector light beam modulating system based on magneto-optic effect according to claim 1, is characterized in that above-mentioned spatial light modulator is the spatial light modulator being loaded with hologram.
5. the vector light beam modulating system based on magneto-optic effect according to claim 4, is characterized in that above-mentioned spatial light modulator is transmissive spatial light modulator.
6. the vector light beam modulating system based on magneto-optic effect according to any one of claim 1 to 5, is characterized in that above-mentioned two wave plates are two quarter-wave plates or 1/2nd wave plates.
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| CN201420565646.XU CN204065597U (en) | 2014-09-28 | 2014-09-28 | A kind of vector light beam modulating system based on magneto-optic effect |
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| CN201420565646.XU CN204065597U (en) | 2014-09-28 | 2014-09-28 | A kind of vector light beam modulating system based on magneto-optic effect |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104536164A (en) * | 2014-09-28 | 2015-04-22 | 广东工业大学 | Magneto-optical effect based vector polarization light beam modulation system and method |
| CN114077067A (en) * | 2021-11-29 | 2022-02-22 | 曲阜师范大学 | Vector light field generating device with polarization changing along any circular path on Poincare sphere |
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2014
- 2014-09-28 CN CN201420565646.XU patent/CN204065597U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104536164A (en) * | 2014-09-28 | 2015-04-22 | 广东工业大学 | Magneto-optical effect based vector polarization light beam modulation system and method |
| CN104536164B (en) * | 2014-09-28 | 2018-05-08 | 广东工业大学 | A kind of vector light beam modulating system and method based on magneto-optic effect |
| CN114077067A (en) * | 2021-11-29 | 2022-02-22 | 曲阜师范大学 | Vector light field generating device with polarization changing along any circular path on Poincare sphere |
| CN114077067B (en) * | 2021-11-29 | 2023-12-08 | 曲阜师范大学 | Vector light field generating device with arbitrary circular path change on polarization along poincare sphere |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141231 Termination date: 20190928 |