CN110955057A - Fourier phase grating terahertz wave beam splitter - Google Patents
Fourier phase grating terahertz wave beam splitter Download PDFInfo
- Publication number
- CN110955057A CN110955057A CN201911153751.6A CN201911153751A CN110955057A CN 110955057 A CN110955057 A CN 110955057A CN 201911153751 A CN201911153751 A CN 201911153751A CN 110955057 A CN110955057 A CN 110955057A
- Authority
- CN
- China
- Prior art keywords
- phase grating
- disc
- beam splitter
- fourier phase
- support frame
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/44—Grating systems; Zone plate systems
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
The invention discloses a Fourier phase grating terahertz wave beam splitter, which comprises a two-dimensional Fourier phase grating, a support frame, a rotating table, a disc, a base, a height adjusting knob and a rotating shaft, wherein four corners of the two-dimensional Fourier phase grating are fixed on the support frame through screws, the lower end of the support frame is fixed through a positioning pin and the rotating table, the rotating table is fixed at the upper end of the disc through the height adjusting knob and a height adjusting jack, and the disc is fixed at the upper end of the base through a metal column and a fixing hole; the lower end of the rotating shaft is fixed in the middle of the upper end of the base, and the upper end of the rotating shaft sequentially penetrates through the through hole in the middle of the disc, the through hole in the middle of the rotating table and the round hole in the middle of the lower end of the support frame to be matched. On the premise of ensuring higher diffraction efficiency, the beam splitter has a simple structure, and the angle and the height of the beam splitter can be adjusted, so that the complexity and the cost of a system suitable for the beam splitter are reduced.
Description
Technical Field
The invention relates to the technical field of terahertz, in particular to a Fourier phase grating terahertz wave beam splitter.
Background
Under the condition that a terahertz source is rare, the terahertz source is split in space by using a quasi-optical technology so as to meet the requirement of a mixing end of a multi-channel superheterodyne receiver on a plurality of local oscillation sources, which is very important, and the existing phase gratings which can realize sixteen equal beam splitting and are arranged in a 4 multiplied by 4 array form include a Dammann grating and a two-dimensional Fourier phase grating.
The two-dimensional Fourier phase grating is composed of a plurality of periodic units, the phase function of the surface of each unit can be represented by a limited number of Fourier series, and the purposes of enhancing the target diffraction series and inhibiting other diffraction series can be achieved by controlling the size of the Fourier coefficient so as to obtain a plurality of constant amplitude diffraction beams. Compared with a Dammann grating, the reflective Fourier phase grating has the advantages of high diffraction efficiency, low loss and low processing difficulty when being used as a beam splitter due to the continuity of the phase.
When more than three constant-amplitude diffraction beams need to be generated, particularly when a target diffraction beam needs to meet a certain two-dimensional arrangement mode, the design of the two-dimensional Fourier phase grating is similar to the one-dimensional Fourier phase grating in theory, but the number of variables of Fourier coefficients is increased due to the increase of the dimension and the number of target diffraction orders, and an algorithm for determining the Fourier phase grating surface phase function is more complicated. At present, two-dimensional Fourier phase grating research for generating 4 × 4 array diffraction beams is less, array beams arranged in a 2-4-2 mode are obtained by adopting a first design idea, and then sixteen local vibration sources are provided for a 4 × 4 array receiver by two groups of staggered eight beams, but the number of used devices is multiplied, and the complexity of an optical path and the system cost are aggravated.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a Fourier phase grating terahertz wave beam splitter, aiming at the problems that the number of used devices is multiplied, the complexity of a light path is aggravated and the system cost is high in the existing two-dimensional Fourier phase grating method for obtaining a 4 x 4 source.
The technical scheme is as follows: in order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a Fourier phase grating terahertz wave beam splitter comprises a two-dimensional Fourier phase grating, a support frame, a rotary table, a disc, a base, a height adjusting knob and a rotating shaft, wherein four corners of the two-dimensional Fourier phase grating are fixed on the support frame through screws, the lower end of the support frame is fixed through a positioning pin and the rotary table, height adjusting jacks and fixing holes are uniformly formed in the middle of the disc, the height adjusting jacks and the fixing holes penetrate through the disc, the rotary table is fixed at the upper end of the disc through the height adjusting knob and the height adjusting jacks, and the disc is fixed at the upper end of the base through a metal column and the fixing holes;
the round hole has been seted up at the lower extreme middle part of support frame, the middle part of revolving stage and disc all is provided with the through hole, the lower extreme of pivot is fixed at the upper end middle part of base, the upper end of pivot passes the through hole at disc middle part and the through hole at revolving stage middle part and the round hole looks adaptation at support frame lower extreme middle part in proper order.
Further, a periodic structure is arranged in the middle of the two-dimensional Fourier phase grating, and the periodic structure is provided with 5 × 5 periodic units.
Further, the periodic structure may be characterized by a phase function, specifically:
wherein:
is a phase function of a two-dimensional fourier phase grid,
and
phase function being a one-dimensional Fourier phase grid, amIs the coefficient of the mth Fourier series, anThe coefficient is the coefficient of the nth Fourier series, m and n are the order size of the Fourier series, D is the period of the two-dimensional Fourier phase grating unit, and x and y are the positions of the Fourier phase grating surface for wave front phase modulation.
Furthermore, an angle indicating needle is embedded in the upper surface of the rotating table, and an angle value is arranged on the upper surface of the disc.
Furthermore, the four corners of the base are provided with positioning holes, and the base can be fixed through the positioning holes.
Has the advantages that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:
according to the Fourier phase grating terahertz wave beam splitter disclosed by the invention, on the premise of ensuring higher diffraction efficiency, the obtained two-dimensional Fourier phase grating surface phase function is more stable, the angle and the height of the beam splitter disclosed by the invention are adjustable, the beam direction can be changed as required, the operation is flexible, the structure is simple and reliable, the processing difficulty is low, and the complexity and the cost of a system suitable for the beam splitter are reduced.
Drawings
FIG. 1 is a three-dimensional schematic diagram of a Fourier phase grating terahertz wave beam splitter of the invention
FIG. 2 is a block-line diagrammatic illustration of a Fourier phase grating terahertz wave beam splitter of the present invention;
FIG. 3 is a schematic top view of a Fourier phase grating terahertz wave beam splitter of the present invention;
FIG. 4 is a schematic view of the angular scale of the upper surface of the disk of the present invention;
FIG. 5 is a contour plot of a two-dimensional Fourier phase grid cell structure of the present invention;
the numbers in the figures correspond to part names:
1. a two-dimensional Fourier phase grid; 2. a support frame; 3. a rotating table; 4. a disc; 5. a base; 6. a height adjustment knob; 7. transferring and pumping; 8. a screw; 9. a periodic structure; 10. a metal post; 11 a circular hole; 12. positioning a pin; 13. positioning holes; 14. an angle indicating needle; 15. the angle value.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. The described embodiments are a subset of the embodiments of the invention and are not all embodiments of the invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Example 1
Referring to fig. 1, 2, 3, 4, and 5, the present embodiment provides a fourier phase grating terahertz wave beam splitter, which includes a two-dimensional fourier phase grating 1, a support frame 2, a rotary table 3, a disc 4, a base 5, a height adjusting knob 6, and a rotating shaft 7. The middle part of the two-dimensional Fourier phase grating 1 is provided with a periodic structure 9 which plays a role in regulating and controlling the wave front phase, and the periodic structure 9 is provided with 5 multiplied by 5 periodic units. Round hole 11 has been seted up at the lower extreme middle part of support frame 2, and the four corners of two-dimentional Fourier looks bars 1 respectively fixes on support frame 2 through a detachable screw 8, and then realizes the real-time change of the Fourier looks bars of different functions and frequency channels. In particular, the periodic structure 9 can be characterized by a phase function, in particular:
wherein:
is a phase function of a two-dimensional fourier phase grid,
and
phase function being a one-dimensional Fourier phase grid, amIs the coefficient of the mth Fourier series, anThe coefficient is the coefficient of the nth Fourier series, m and n are the order size of the Fourier series, D is the period of the two-dimensional Fourier phase grating unit, and x and y are the positions of the Fourier phase grating surface for wave front phase modulation.
In this embodiment, the operating frequency of the two-dimensional fourier phase grating 1 is selected to be 300GHz, the cell size is selected to be 12mm × 12mm, the cell number is selected to be 5 × 5, the minimum machining radius of curvature is 760 μm, and the size of the base 5 is selected to be 160mm × 160 mm.
Fix through stop pin 12 between revolving stage 3 and the support frame 2, and stop pin 12 connects is the lower extreme of support frame 2 to revolving stage 3 can drive support frame 2 and rotate together. In this embodiment, the middle of the disc 4 is uniformly provided with four height adjustment jacks and four fixing holes, and the four height adjustment jacks penetrate through the disc 4, that is, the hole depth of the height adjustment jacks is the same as the thickness of the disc 4. Specifically, the number of the height adjusting knobs 6 is the same as the number of the height adjusting insertion holes, i.e., four, and at the same time, the height adjusting knobs 6 pass through the height adjusting insertion holes of the disk 4 to contact the lower end of the rotary table 3, and since the surfaces of the height adjusting knobs 6 are provided with threads, the horizontal height of the two-dimensional fourier phase grating 1 can be adjusted by rotating the four height adjusting knobs 6. Meanwhile, the number of the metal posts 10 and the number of the fixing holes are the same, namely four, and the disc 4 is fixed at the upper end of the base 5 through the metal posts 10 and the fixing holes.
In this embodiment, the through holes are formed in the middle of the rotary table 3 and the disc 4, the lower end of the rotating shaft 7 is fixed to the middle of the upper end of the base 5, and meanwhile, the upper end of the rotating shaft 7 sequentially penetrates through the through hole in the middle of the disc 4, the through hole in the middle of the rotary table 3 and the round hole 11 in the middle of the lower end of the support frame 2 to be matched, so that the support frame 2, the rotary table 3, the disc 4 and the base 5 are assembled together. Specifically, after the upper end of the rotating shaft 7 is matched with the round hole 11, a margin is left in the depth of the round hole 11, which is to facilitate the up-and-down movement of the support frame 2 and further adjust the height of the two-dimensional fourier phase grating 1. Meanwhile, in order to facilitate the use of the Fourier phase grating terahertz wave beam splitter in a system, positioning holes 13 are formed in four corners of the base 5, so that the base 5 can be fixed in the system through the positioning holes 13.
In this embodiment, an angle indicator 14 is embedded in the upper surface of the rotary table 3, and an angle value 15 of 0 to 360 ° is set on the upper surface of the disc 4. When the angle of the two-dimensional Fourier phase grating 1 needs to be deflected, after the angle value 15 needing to be deflected is confirmed, the rotating table 3 can be rotated, and the angle indicator 14 is aligned to the angle value 15 needing to be deflected, so that the angle deflection of the two-dimensional Fourier phase grating 1 can be realized.
In this embodiment, the calculated values of the 13 fourier coefficients are: 1.9948, -0.9740, -0.6495, -0.3434,0.3762, -0.0118, -0.2489,0.0318,0.1813,0.0254, -0.1249,0.0075,0.0886.
Referring to fig. 6, fig. 6 is a power distribution diagram of a 4 × 4 diffraction beam array for two-dimensional fourier phase grating terahertz wave beam splitting, where the relative angle between each diffraction beam is smaller than 16 °, and the diffraction efficiency corresponding to each beam is from left to right, and then from top to bottom: 0.043, 0.043, 0.053, 0.062, 0.062, 0.052, 0.050, 0.065, 0.065, 0.050, 0.027, 0.044, 0.044, 0.027, and an overall diffraction efficiency of 85.6%.
Besides the small beam power at the lower left corner and the lower right corner, the power distribution of other beams is uniform, so that the two-dimensional Fourier phase grating terahertz wave beam splitter provided by the embodiment is high in diffraction efficiency, 16 equal-division beam splitting can be well realized, one terahertz source is converted into a 4 x 4 array source, and the two-dimensional Fourier phase grating terahertz wave beam splitter is high in machinability, flexible to operate and simple and reliable in structure.
The present invention and its embodiments have been described in an illustrative manner, and are not to be considered limiting, as illustrated in the accompanying drawings, which are merely exemplary embodiments of the invention and not limiting of the actual constructions and methods. Therefore, if the person skilled in the art receives the teaching, the structural modes and embodiments similar to the technical solutions are not creatively designed without departing from the spirit of the invention, and all of them belong to the protection scope of the invention.
Claims (5)
1. A Fourier phase grating terahertz wave beam splitter is characterized by comprising a two-dimensional Fourier phase grating (1), a support frame (2), a rotary table (3), a disc (4), a base (5), a height adjusting knob (6) and a rotating shaft (7), four corners of the two-dimensional Fourier phase grating (1) are fixed on the support frame (2) through screws (8), the lower end of the support frame (2) is fixed with the rotary table (3) through a positioning pin (12), the middle part of the disc (4) is uniformly provided with a height adjusting jack and a fixing hole, the height adjusting jacks and the fixing holes penetrate through the disc (4), the rotating table (3) is fixed at the upper end of the disc (4) through the height adjusting knobs (6) and the height adjusting jacks, the disc (4) is fixed at the upper end of the base (5) through a metal column (10) and a fixing hole;
round hole (11) have been seted up at the lower extreme middle part of support frame (2), the middle part of revolving stage (3) and disc (4) all is provided with the through hole, the upper end middle part in base (5) is fixed to the lower extreme of pivot (7), the upper end of pivot (7) passes the through hole at disc (4) middle part and the through hole at revolving stage (3) middle part in proper order and round hole (11) looks adaptation at support frame (2) lower extreme middle part.
2. The Fourier phase grating terahertz wave beam splitter according to claim 1, wherein a periodic structure (9) is arranged in the middle of the two-dimensional Fourier phase grating (1), and the periodic structure (9) is provided with 5 x 5 periodic units.
3. The Fourier phase grating terahertz wave beam splitter according to claim 2, wherein the periodic structure (9) can be characterized by a phase function, specifically:
wherein:
is a phase function of a two-dimensional fourier phase grid,
and
phase function being a one-dimensional Fourier phase grid, amIs the coefficient of the mth Fourier series, anIs the coefficient of the nth Fourier series, m and n are the order size of the Fourier series, D isThe period of the two-dimensional Fourier phase grating cell, x and y are the positions of the Fourier phase grating surface on the wavefront phase modulation.
4. The Fourier phase grating terahertz wave beam splitter according to claim 1, 2 or 3, characterized in that an angle indicator (14) is embedded on the upper surface of the rotating table (3), and the upper surface of the disk (4) is provided with an angle value (15).
5. The Fourier phase grating terahertz wave beam splitter according to claim 4, wherein positioning holes (13) are formed in four corners of the base (5), and the base (5) can be fixed through the positioning holes (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911153751.6A CN110955057A (en) | 2019-11-22 | 2019-11-22 | Fourier phase grating terahertz wave beam splitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911153751.6A CN110955057A (en) | 2019-11-22 | 2019-11-22 | Fourier phase grating terahertz wave beam splitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110955057A true CN110955057A (en) | 2020-04-03 |
Family
ID=69978069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911153751.6A Pending CN110955057A (en) | 2019-11-22 | 2019-11-22 | Fourier phase grating terahertz wave beam splitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110955057A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112354940A (en) * | 2020-11-02 | 2021-02-12 | 湖州南丰机械制造有限公司 | Casting cleaning machine with electric turntable and high-pressure water gun |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324910A (en) * | 2011-05-30 | 2012-01-18 | 天津大学 | Electro-optical bidirectional tunable finite impulse response (FIR) filter and discrete voltage determination method thereof |
| CN103235395A (en) * | 2013-04-24 | 2013-08-07 | 中国科学院上海光学精密机械研究所 | Prism beam expanding device |
| CN203519907U (en) * | 2013-11-06 | 2014-04-02 | 福州巴斯光电技术有限公司 | One-dimension adjusting device for cylindrical lens light path |
| CN103760558A (en) * | 2014-01-23 | 2014-04-30 | 电子科技大学 | Terahertz radar ISAR imaging method |
| CN104360452A (en) * | 2014-11-12 | 2015-02-18 | 核工业理化工程研究院 | High-stable grating regulator |
| CN107462584A (en) * | 2017-08-08 | 2017-12-12 | 吉林大学 | Multiple degrees of freedom adjusting means, digital micro-mirror bad point detection device and method |
-
2019
- 2019-11-22 CN CN201911153751.6A patent/CN110955057A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102324910A (en) * | 2011-05-30 | 2012-01-18 | 天津大学 | Electro-optical bidirectional tunable finite impulse response (FIR) filter and discrete voltage determination method thereof |
| CN103235395A (en) * | 2013-04-24 | 2013-08-07 | 中国科学院上海光学精密机械研究所 | Prism beam expanding device |
| CN203519907U (en) * | 2013-11-06 | 2014-04-02 | 福州巴斯光电技术有限公司 | One-dimension adjusting device for cylindrical lens light path |
| CN103760558A (en) * | 2014-01-23 | 2014-04-30 | 电子科技大学 | Terahertz radar ISAR imaging method |
| CN104360452A (en) * | 2014-11-12 | 2015-02-18 | 核工业理化工程研究院 | High-stable grating regulator |
| CN107462584A (en) * | 2017-08-08 | 2017-12-12 | 吉林大学 | Multiple degrees of freedom adjusting means, digital micro-mirror bad point detection device and method |
Non-Patent Citations (1)
| Title |
|---|
| 于昆: ""基于微小透镜的太赫兹阵列天线关键技术研究"", 《中国优秀硕士学位论文全文数据库 基础科学辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112354940A (en) * | 2020-11-02 | 2021-02-12 | 湖州南丰机械制造有限公司 | Casting cleaning machine with electric turntable and high-pressure water gun |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110955057A (en) | Fourier phase grating terahertz wave beam splitter | |
| US7440188B2 (en) | Diffractive optical element | |
| US20150380829A1 (en) | Configurable microwave deflection system | |
| US20060114955A1 (en) | Spectral control of laser diode bars and stacks | |
| CN102832092A (en) | Ion implantation apparatus and ion implantation method | |
| US20080137189A1 (en) | Conversion of the polarization of light via a composite half-wave plate | |
| CN104303090A (en) | Aberration correction device and laser microscope | |
| CN108873316A (en) | Muti-piece multichannel is multiplexed volume Bragg grating and cascades angular deflection device | |
| CN112130231B (en) | Super-surface system for generating column vector beams with adjustable polarization orders and construction method | |
| CN109343290A (en) | It is a kind of to construct controllable laser accunputure array approach based on collinear array theory of radiation | |
| CN110253155B (en) | Laser processing device controlled by microcracks | |
| US4270129A (en) | Apparatus and method for realizing preselected free space antenna patterns | |
| Elliott | Array pattern synthesis | |
| CN109119311B (en) | coherent electromagnetic radiation generating system and method | |
| CN218383369U (en) | Preparation system of polarization grating | |
| CN114428397A (en) | Two-dimensional angle deflector for rotary multiplexing volume Bragg grating | |
| CN106773077A (en) | A kind of array beam splitting method and system based on liquid crystal phase control act | |
| Fuse | Flattop Beam Generation and Multibeam Processing Using Aspheric and Diffractive Optics. | |
| AU2003269688A1 (en) | Neutron optical element for the small angle neutron scattering measuring technique | |
| CN204832679U (en) | Light beam scanning angle amplifier based on two refracting prism | |
| CN203519905U (en) | Two-dimension adjusting device for cylindrical lens light path | |
| CN112968299A (en) | Basic unit, super-surface and arrival angle estimation method based on information super-surface | |
| RU2314610C1 (en) | Method for power optimization of phased antenna array | |
| CN112859215A (en) | Quasi-continuous super-surface beam splitter of infrared band | |
| Chen et al. | Design of 2-dimension sparse arrays using an improved genetic algorithm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200403 |
|
| RJ01 | Rejection of invention patent application after publication |