CN104914585A - Non-local-media-based spatial frequency beam splitter - Google Patents
Non-local-media-based spatial frequency beam splitter Download PDFInfo
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- CN104914585A CN104914585A CN201510397066.3A CN201510397066A CN104914585A CN 104914585 A CN104914585 A CN 104914585A CN 201510397066 A CN201510397066 A CN 201510397066A CN 104914585 A CN104914585 A CN 104914585A
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- nonlocal
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- 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
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The invention relates to the transmission and conversion technologies of the light beam and discloses a design scheme using a non-local media to realize a spatial frequency beam splitter. A signal source outputs a gauss beam with linear polarization; the light beam passes through two convex lenses and is collimated; after reflection by a reflector, the light beam passes through a spatial light modulator that is controlled by a computer to be loaded with phase information and then passes through a convex lens with adjustable focal length to obtain an Airy beam; and the obtained Airy beam passes through a device formed by a strong non-local media, a multi-soliton beam is formed. The multi-peak structure of the Airy beam corresponds to different spatial frequencies; and after the non-local media, beam splitting is carried out to form multiple solitons with large space intervals, thereby realizing good and convenient reception. According to the invention, the spatial frequency splitting is realized by using the non-local media directly. The scientific principle can be implemented easily. The splitter not only can be used as a unit to carry out splitting on a received signal but also can be used as one applied to space frequency wavelength division multiplexing of optical communication.
Description
Technical field
The present invention relates to transmission and the converter technique of light beam, be specifically related to a kind of design proposal and device thereof of the spatial frequency beam splitter based on Nonlocal Media, can be applicable to the frequency demultiplexing field of optical communication.
Background technology
Along with the intensification to nonlinear transport area research, researchist finds in nonlinear optical system, and non-local effect is ubiquitous.In actual life, many important optical mediums all have non-local effect, when there is certain flooding mechanism in physical system, such as: atoms permeating, thermal effect and atom ballistic transport etc., the impact of non-local effect will be strengthened.This concept of non-local effect is proposed in 1997 by Snyder and Mitchell on Science.After this, scientists finds that light beam transmission in Nonlocal Media can present the odd number solution much do not possessed in local medium, such as: can effectively suppress subsiding of higher-dimension orphan, forms stable higher-dimension orphan; Can there is and stablize the multiple orphan with labyrinth; To the flecition that beam Propagation has.Along with these find, the focus about beam Propagation research also starts to shift towards this direction of Nonlocal Media.
, we have proposed a kind of Airy beam with non-diffraction beam here, study its transport property in Nonlocal Media.Why select Airy beam, mainly because it has a lot of odd number solution, comprising: length is apart from the characteristic of salt free ligands transmission, strong jamproof self-healing feature and the characteristic freely can accelerating transmission in constant interface.Be different from the light beam of single-peak structure, Airy beam has multi-peaks structure, and its optical field distribution presents asymmetry, it can be made to transmit in Nonlocal Media and occur much peculiar phenomenon.Just because of Airy beam has the characteristic of so many excellence, transmit in Nonlocal Media so study it there is certain values.
We find under certain conditions, and Airy beam can be converted to multiple spatial soliton under the impact of non-local effect, and this characteristic is non-existent in local medium.Because the spatial soliton stability exported is high, and scope interval is comparatively large, and this contributes to the demultiplexing of implementation space frequency, can as a kind of space optical communication frequency beam splitter.The present invention proposes a kind of system and design proposal of the spatial frequency beam splitter based on Nonlocal Media, directly Gaussian beam can be converted to space many orphans light beam, realize a kind of space optical communication frequency beam splitter.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of design proposal of the spatial frequency beam splitter based on Nonlocal Media, principle is simple, easy realization, has actual application value, Gaussian beam can be demultiplexing as multiple spatial soliton, realize structure simple, low cost of manufacture.
For achieving the above object, the technical solution used in the present invention is to provide a kind of design proposal of the spatial frequency beam splitter based on Nonlocal Media, comprises the steps:
(1) its half-breadth is adjusted to the Gaussian beam of linear polarization high, obtain the Gaussian beam collimated;
(2) by the Collimated Gaussian Beam that obtains after phase-modulation and Fourier phase modulating transformation, obtain Airy beam;
(3) by after Nonlocal Media, the conversion of many orphans is realized, the beam splitting of final implementation space frequency.
Technical solution of the present invention also comprises the device providing a kind of spatial frequency beam splitter based on Nonlocal Media, by the Gaussian beam of signal source output linearity polarization, be collimated as halfwidth is the Gaussian beam of 6.7 millimeters after two convex lens, by changing the distance between two convex lens, the half-breadth that can adjust Gaussian beam is high; After being reflected by the Collimated Gaussian Beam obtained, by being loaded with the spatial light modulator of phase information by computer operating, light beam is returned at spatial modulator front end reflection; By the light beam that reflects through the controlled convex lens of a focal length, after Fourier phase modulating transformation, obtain Airy beam; By the device of the Airy beam obtained by being made up of strong nonlocality medium, obtaining the many orphans light beam after beam splitting, exporting after photo-detector is caught.
The Gaussian beam of signal source output linearity polarization of the present invention; Described catoptron is front surface silvered mirror; Described focus adjustable convex lens are to realize Fourier transform, can obtain the different Airy beam of spot size by selecting the different convex lens of focal length; Described spatial modulator is Reflective spatial modulator, is loaded in spatial modulator by computing machine by phase information, carries out phase-modulation to incident beam; Described Nonlocal Media is nematic liquid crystal crystal, for the final beam splitting to Airy beam, realizes the output of many orphans; Described photo-detector is used for the change procedure that dynamic instrumentation exports light, catches many orphans of output.
Due to the utilization of technique scheme, the present invention compared with prior art has the following advantages:
1, directly utilize Gaussian beam to carry out the output of the many orphans in implementation space, principle is simple, easily realizes;
2, apparatus structure is simple, is easy to adjustment, low cost of manufacture;
3, do not need by other special optical elements, device stability is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of spatial frequency beam splitter apparatus based on Nonlocal Media that the embodiment of the present invention provides;
Fig. 2 is the change procedure schematic diagram of light beam in the embodiment of the present invention; A initial Gaussian light beam schematic diagram that () exports from signal source; B Airy beam schematic diagram that () is changed by Gaussian beam; C () eventually passes through the space many orphans light beam schematic diagram after Nonlocal Media beam splitting;
In figure, 1: signal source; 2a-2c: convex lens; 3: catoptron; 4: spatial light modulator; 5 Nonlocal Medias; 6: photo-detector; 7: computing machine.
Embodiment
Below in conjunction with drawings and Examples, technical solution of the present invention is further described.
See accompanying drawing 1, the spatial frequency beam splitter apparatus system based on Nonlocal Media that the present embodiment proposes, comprises signal source 1, convex lens 2a-2c, catoptron 3, spatial light modulator 4, Nonlocal Media 5, photo-detector 6, computing machine 7.
The function of each part mentioned above is respectively described below:
Signal source 1, for the Gaussian beam of output linearity polarization;
Convex lens 2a-2b, for collimating the Gaussian beam of output, and the half-breadth of adjustment Gaussian beam is high;
Convex lens 2c, for Fourier phase modulating transformation, can obtain the different Airy beam of spot size by selecting the different convex lens of focal length;
Catoptron 3, for the reflection of light beam, the catoptron that the present embodiment selects front surface silver-plated;
Spatial light modulator 4, for exporting the Gaussian beam with three rank phase places, obtain three rank phase places, the present embodiment selects Reflective spatial modulator;
Nonlocal Media 5, for the final beam splitting to Airy beam, realizes the output of many orphans, and the Nonlocal Media that the present embodiment is selected is nematic liquid crystal crystal;
Photo-detector 6, exports the change procedure of light, catches the many orphans in space of output for dynamic instrumentation;
Computing machine 7, for modulating the output phase place of spatial modulator.
The spatial frequency beam splitter based on Nonlocal Media utilizing said apparatus to design, concrete operation step is as follows:
1, by the Gaussian beam of signal source 1 output linearity polarization, initial Gaussian light beam, see accompanying drawing 2 (a), is collimated after planoconvex lens 2a, 2b as halfwidth is the Gaussian beam of 6.7 millimeters.By changing the distance between convex lens 2a and 2b, the half-breadth that can adjust Gaussian beam is high.
2, Collimated Gaussian Beam is after catoptron 3 reflects, and be loaded with in the spatial light modulator 4 of phase information by being manipulated by computing machine 7, light beam is returned at modulator 4 front end reflection.
3, by the light beam that reflects through the controlled convex lens 2c of a focal length, after Fourier phase modulating transformation, obtain Airy beam, see accompanying drawing 2 (b).
4, after convex lens 2c, place Nonlocal Media 5, this Nonlocal Media 5 is nematic liquid crystal crystal.Allow Airy beam by Nonlocal Media 5, finally obtain the many orphans light beam after beam splitting, see accompanying drawing 2 (c).
Final space many orphans light beam, after photo-detector 6 detects, exports by the many orphans light beam 5, obtained.
Claims (7)
1., based on a design proposal for the spatial frequency beam splitter of Nonlocal Media, it is characterized in that following steps:
(1) by the Gaussian beam of signal source output linearity polarization, be collimated after two convex lens as halfwidth is the Gaussian beam of 6.7 millimeters, by changing the distance between two convex lens, the half-breadth that can adjust Gaussian beam is high;
(2), after being reflected by the Collimated Gaussian Beam obtained, by being loaded with the spatial light modulator of phase information, light beam is returned at modulator front end reflection;
(3) by the light beam that reflects through the convex lens of a focus adjustable, obtain Airy beam;
(4) by the Airy beam that obtains by Nonlocal Media, export the many orphans light beam after beam splitting, export after photo-detector is caught.
2. the device based on the spatial frequency beam splitter of Nonlocal Media, comprise signal source, convex lens, catoptron, spatial light modulator, Nonlocal Media, photo-detector, computing machine, it is characterized in that: by the Gaussian beam of signal source output linearity polarization, be collimated as halfwidth is the Gaussian beam of 6.7 millimeters after two convex lens, by changing the distance between two convex lens, the half-breadth that can adjust Gaussian beam is high; By rear by being loaded with the spatial light modulator of phase information by computer operating for the Gaussian beam reflection after collimation, light beam is returned at modulator front end reflection; By the light beam that reflects through the controlled convex lens of a focal length, after realizing Fourier phase modulating transformation, output Airy beam; By Airy beam by Nonlocal Media, obtain the many orphans light beam after beam splitting, finally export after photo-detector detection.
3. the device of a kind of spatial frequency beam splitter based on Nonlocal Media according to claim 2, is characterized in that: described catoptron is front surface silvered mirror.
4. the device of a kind of spatial frequency beam splitter based on Nonlocal Media according to claim 2, it is characterized in that: described spatial modulator is by computer operating, incident beam exports with the form of reflection after the enterprising line phase modulation of spatial light modulator, and usage space photomodulator is mainly in order to obtain three rank phase places.
5. the device of a kind of spatial frequency beam splitter based on Nonlocal Media according to claim 2, it is characterized in that: described focus adjustable convex lens are to realize Fourier phase modulating transformation, finally obtaining Airy beam, the different Airy beam of spot size can be obtained by selecting the convex lens of different focal.
6. the device of a kind of spatial frequency beam splitter based on Nonlocal Media according to claim 2, is characterized in that: described Nonlocal Media is nematic liquid crystal crystal, and it can show strong nonlocality characteristic.
7. the device of a kind of spatial frequency beam splitter based on Nonlocal Media according to claim 2, is characterized in that: described photo-detector is used for the many orphans light beam after dynamic instrumentation beam splitting.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931885A (en) * | 2019-03-06 | 2019-06-25 | 华南师范大学 | A kind of device of precise measurement light beam incidence angle |
| CN112835066A (en) * | 2021-01-07 | 2021-05-25 | 湖南大学 | Associated imaging scheme for panoramic scanning of far field |
| CN115031930A (en) * | 2022-06-13 | 2022-09-09 | 浙江大学 | Phase recovery wavefront detection device and method with adjustable measurement frequency |
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| CN104216121A (en) * | 2014-09-30 | 2014-12-17 | 浙江师范大学 | Method of forming space-time airy bunching in free space |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104216121A (en) * | 2014-09-30 | 2014-12-17 | 浙江师范大学 | Method of forming space-time airy bunching in free space |
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| FATTAL Y ETC: "Soliton shedding from Airy pulses in Kerr media", 《OPTICS EXPRESS》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931885A (en) * | 2019-03-06 | 2019-06-25 | 华南师范大学 | A kind of device of precise measurement light beam incidence angle |
| CN109931885B (en) * | 2019-03-06 | 2024-03-26 | 华南师范大学 | Device for accurately measuring incidence angle of light beam |
| CN112835066A (en) * | 2021-01-07 | 2021-05-25 | 湖南大学 | Associated imaging scheme for panoramic scanning of far field |
| CN115031930A (en) * | 2022-06-13 | 2022-09-09 | 浙江大学 | Phase recovery wavefront detection device and method with adjustable measurement frequency |
| CN115031930B (en) * | 2022-06-13 | 2023-03-28 | 浙江大学 | Phase recovery wavefront detection device and method with adjustable measurement frequency |
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Application publication date: 20150916 |