CN110827638A - Light field generating device - Google Patents
Light field generating device Download PDFInfo
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- CN110827638A CN110827638A CN201911052851.XA CN201911052851A CN110827638A CN 110827638 A CN110827638 A CN 110827638A CN 201911052851 A CN201911052851 A CN 201911052851A CN 110827638 A CN110827638 A CN 110827638A
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- 230000003287 optical effect Effects 0.000 claims abstract description 67
- 239000011521 glass Substances 0.000 claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000005530 etching Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 230000010287 polarization Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000005350 fused silica glass Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001259 photo etching Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009828 non-uniform distribution Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/22—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for optics
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/44—Grating systems; Zone plate systems
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- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The invention relates to the technical field of optical teaching experimental instruments and equipment, in particular to a light field generating device which comprises a laser, a beam expanding and collimating component, a filter, a first polarizer, a binary optical grating glass slide, a second polarizer and a CCD camera, wherein the laser, the beam expanding and collimating component, the filter, the first polarizer, the binary optical grating glass slide, the second polarizer and the CCD camera are sequentially arranged along the light transmission direction, a plurality of stripes are etched on the binary optical grating glass slide, and the central parts of stripe patterns are in a cross shape. The light field generating device can generate a more complex structured light field, and provides a new method and a new way for generating the structured light field; the optical field generating device does not need a spatial light modulator, is used as a teaching experimental instrument, is simple to operate, easy to master by students and low in cost, and saves a large amount of expenses for purchasing related optical experimental instrument equipment in colleges and universities.
Description
Technical Field
The invention relates to the technical field of optical teaching experimental instruments and equipment, in particular to a light field generating device.
Background
In recent years, the control of vector light fields has been more and more emphasized by scholars, and the concept of controlling vector light fields is proposed in contrast to scalar light fields. Light fields commonly studied such as linear polarization, circular polarization, and elliptical polarization all belong to scalar light fields, and their polarization states are uniformly distributed in space, that is, the same polarization state exists at any position of the wavefront. However, the vector light fields are different, and the polarization state distribution of the vector light fields is spatially changed, and the vector light fields are light fields with different polarization states at different positions on the same wavefront at the same time, and are also called as light fields with non-uniform distribution of the polarization states. The special property leads the vector light field to have important academic value and potential application in many scientific fields. The most basic examples of vector light fields are radially polarized light and rotationally polarized light. The polarization state of any point on the wave fronts of the two polarized lights is linear polarization, but the inclination directions of the linear polarization are different at different positions. The electric vector vibration of any point on the radial polarized light wave front is along the radial direction of a polar coordinate system, and the electric vector vibration of any point on the same wave front of the spin polarized light at the same moment is along the tangential direction, namely the direction of an azimuth angle in the polar coordinate system. The local polarization states of radially and rotationally polarized light are linearly polarized, so we can still detect their properties through the polarizer. The methods for modulating polarized light are various, most of the methods are complicated to operate, the devices are complex, the cost is high, and great inconvenience is brought to researchers.
Disclosure of Invention
The present invention has an object to provide a light field generating device which can generate a vector light beam without requiring a spatial light modulator.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a light field generating device, includes along laser instrument, the beam expanding collimation subassembly, filter, first polaroid, binary optical grating slide, second polaroid and the CCD camera that light transmission direction set gradually, wherein, the sculpture has a plurality of stripes on the binary optical grating slide, the central part of stripe pattern is the intersection form.
Further, the width of the stripe is equal to the distance between two adjacent stripes.
Further, the depth of the fringes is λ/(2n-2), where λ is the wavelength of the laser light and n is the refractive index of the binary optical grating glass.
Further, the length of the first stripe with the most common length in the plurality of stripes is twice the length of the second stripe group adjacent to the first stripe group.
Further, the second stripe group comprises N stripes, and N is greater than or equal to 1.
Preferably, the second stripe group comprises 1 to 3 stripes.
Further, the crossing position of the cross-shaped stripes is a half of the length of the first stripes or/and one end of the second stripe group far away from the edge of the slide.
Furthermore, the binary optical grating glass is etched with a plurality of stripes to form a circular shape.
Further, the light field generating device also comprises a 4f optical assembly, wherein the 4f optical assembly comprises a first lens with the distance f, a lambda/4 glass slide glued by 90 degrees, a second lens and a grating which are arranged in sequence.
Has the advantages that:
according to the invention, the novel structural glass slide with the specific spacing stripes is used as the binary optical grating glass slide which is arranged between the first polarizing film and the second polarizing film along the light transmission direction, so that the light field generating device can generate a more complex structural light field, and a novel light field form is provided for the structural light field; the optical field generating device does not need a spatial light modulator, is used as a teaching experimental instrument, is simple to operate, easy to master by students and low in cost, and saves a large amount of expenses for purchasing related optical experimental instrument equipment in colleges and universities.
Drawings
FIG. 1 is a schematic view of a binary optical grating slide with a topological charge of 1 and an initial phase of 0 according to the present invention;
FIG. 2 is a schematic view of a binary optical grating slide with a topological charge of 1 and an initial phase of π/2 according to the present invention;
FIG. 3 is a schematic view of a binary optical grating slide with a topological charge of 2 and an initial phase of 0 according to the present invention;
FIG. 4 is a schematic view of a binary optical grating slide with a topological charge of 2 and an initial phase of π/2 according to the present invention;
FIG. 5 is a schematic view of a binary optical grating slide with a topological charge of 3 and an initial phase of 0 according to the present invention;
FIG. 6 is a schematic view of a binary optical grating slide with a topological charge of 3 and an initial phase of π/2 according to the present invention;
fig. 7 is a schematic structural diagram of an embodiment of a light field generating device according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
A light field generating device comprises a laser 1, a beam expanding collimation assembly 17, a filter 4, a first polaroid 5, a binary optical grating slide 6, a second polaroid 11 and a CCD camera 12 which are sequentially arranged along a light transmission direction, wherein a plurality of stripes are etched on the binary optical grating slide 6, and the central parts of stripe patterns are in a cross shape.
Specifically, the laser 1 is for generating laser light, and it is preferable to select the He — Ne laser 1 having an emission light wavelength of 633 nm. The beam expanding and collimating assembly 17 is used for sequentially expanding and collimating the laser light generated by the laser 1, and preferably, the beam expanding and collimating assembly 17 includes a third lens 2 and a fourth lens 3 which are sequentially arranged for expanding and collimating the laser light. The collimated laser is filtered by the filter 4 to obtain a light spot with uniform emergent light, the light spot is polarized by the first polarizing film 5, a linearly polarized light beam with good quality is output to the binary optical grating slide 6 to be modulated and then the second polarizing film 11 is polarized and reaches the CCD camera 12, and a target light beam matched with the stripe shape of the binary optical grating slide 6 is obtained to generate an image with a target shape on the CCD camera 12.
According to the invention, by utilizing a binary optical principle, a spatial light modulator is replaced by a glass slide with a specific interval stripe shape, a complex structured light field can be generated, and a new method and a new way are provided for generating the structured light field; meanwhile, the light field generating device is used as a teaching experimental instrument, is simple to operate, easy to master by students and low in cost, and saves a large amount of expenses for purchasing related optical experimental instrument equipment in colleges and universities.
Further, the distance between two adjacent stripes of the binary optical grating glass 6 is equal to the width of the stripes.
Furthermore, the binary optical grating slide 6 of the present embodiment is made of JGS1 fused silica.
The depth of the fringes is λ/(2n-2), where λ is the wavelength of the laser and n is the refractive index of the JGS1 fused silica.
Specifically, in this embodiment, a laser with a wavelength λ of 633nm is taken as an example:
the depth of the etched stripe of the binary optical grating glass slide 6 is h equal to 693nm +/-30 nm; the stripe widths of the binary optical grating glass 6 are 49.3856um, and the interval width between the stripes is 49.3856 um.
Specifically, in the present embodiment, the size of the binary optical grating slide 6 is 20mm by 3 mm; the stripe pattern etched by the binary optical grating glass slide 6 is positioned in the center of the glass slide; the stripe pattern size of the slide was 19.952mm by 20mm (length by width) and the stripe pattern was as full as possible of the slide.
The sinusoidal grating 10 can be equivalent to a binary optical grating, as shown in fig. 1 and 2, which are schematic diagrams of a binary optical grating slide 6 with a topological charge n of 1 and an initial phase of 0 and pi/2, respectively, and it can be seen from the diagrams that a plurality of stripes are etched on the binary optical grating slide 6, and the formed shape is circular; the length of a first stripe with the most common length in the plurality of stripes is twice that of a second stripe group adjacent to the first stripe group, and the number of the stripes of the second stripe group is one; the longest one of the first stripes in fig. 1 crosses the second stripe group at a position which is one-half the length of the first stripe.
As shown in fig. 3 and 4, which are schematic diagrams of a binary optical grating slide 6 with a topological charge n of 2 and an initial phase of 0, pi/2, respectively, it can be seen from the diagrams that a plurality of stripes are etched on the binary optical grating slide 6, and the formed shape is circular; the length of a first stripe with the most common length in the plurality of stripes is twice that of a second stripe group adjacent to the first stripe group, and the number of the stripes of the second stripe group is two; in fig. 3, two stripes of the second stripe group are crossed, and the crossed position is the end of the second stripe group far away from the edge of the glass slide; the longest first stripe in fig. 4 crosses two stripes of the second stripe group at the end of the second stripe group away from the edge of the slide and at a position half the length of the first stripe.
As shown in fig. 5 and 6, which are schematic diagrams of a binary optical grating slide 6 with a topological charge n of 3 and an initial phase of 0, pi/2, respectively, it can be seen from the diagrams that a plurality of stripes are etched on the binary optical grating slide 6, and the formed shape is circular; the length of a first stripe with the most common length in the plurality of stripes is twice that of a second stripe group adjacent to the first stripe group, and the number of the stripes of the second stripe group is three; in fig. 5, three stripes of the second stripe group cross and cross the longest first stripe, the crossing position is at one end of the second stripe group far away from the edge of the glass sheet and at a position of one half of the length of the first stripe, and the crossing position is at one end of the second stripe group far away from the edge of the glass sheet; in fig. 6, one stripe of the second stripe group crosses the longest first stripe at a position which is one-half the length of the first stripe.
In this embodiment, the process for manufacturing the binary optical grating slide 6 is as follows: firstly simulating a sinusoidal grating with a specific interval and stripes by using MATLAB, converting the sinusoidal grating pattern into a binary optical grating pattern by using an MATLAB program, converting the binary optical grating pattern into a vector diagram which can be used for industrial processing, manufacturing a mask plate required by the grating by using the vector diagram, finally attaching the mask plate on a photoetching machine, and carrying out processes of cleaning, gluing, photoetching, etching and the like on JGS1 fused quartz to manufacture a binary optical grating slide 6.
In the light field generating device in this embodiment, the cross-shaped stripes with specific intervals are etched on the binary optical grating glass 6, so that the vortex polarized light beams can be obtained on the CCD camera 12.
As another embodiment, the light field generating apparatus further includes a 4f optical assembly 19, and the 4f optical assembly 19 includes a first lens 7 with a pitch f, a λ/4 glass slide 8 cemented by 90 degrees, a second lens 9, and a grating 10 arranged in this order. The 4f optical assembly 19 is disposed between the binary optical grating slide 6 and the second polarizer 11, wherein a distance between the binary optical grating slide 6 and the first lens 7 of the 4f optical assembly 19 is f, a distance between the first lens 7 and the slide 8 cemented by 90 degrees 14 is f, and a distance between the slide 8 cemented by 90 degrees 14 and the second lens 9 is f. In the light field generating device of this embodiment, light modulated by the binary optical grating glass 6 enters the 4f optical assembly 19, is processed, and is polarized by the second polarizer 11 to reach the CCD camera 12, so that vector beams with different topological kernels can be obtained on the CCD camera.
As a further preferred embodiment of the experimental apparatus for vector optical teaching, the experimental apparatus further includes a height adjustment assembly including a support 14, an adjustment lever 16, and a knob 15. Specifically, the support column 14 comprises a plurality of support columns which are positioned below the laser 1, the beam expanding and collimating assembly 17, the filter 4, the first polarizer 5, the binary optical grating glass 6, the 4f optical assembly 19, the second polarizer 11 and the CCD camera 12; an adjustment lever 16 is connected above the strut 14; the knob 15 is located on the post 14; the knob 15 is rotatably connected to an adjustment lever 16. The knob 15 is rotated to drive the adjusting rod 16 to slide on the pillar 14 along the vertical direction, so as to realize the height adjustment of the height adjusting assembly to the above components.
Here, when the laser 1, the beam expanding and collimating assembly 17, the filter 4, the first polarizer 5, the binary optical grating glass 6, the 4f optical assembly 19, the second polarizer 11, and the CCD camera 12 are height-adjusted by the height adjusting assembly, it is required that the optical paths of these components are on the same horizontal line.
As a further preferred embodiment of the experimental apparatus for vector optics teaching, the experimental apparatus further comprises a slide assembly including the slide block 13 and the horizontally disposed guide rail 18. The slide 13 comprises a number of corresponding fixed connections below the pillar 14. The sliding block 13 is connected to the guide rail 18 in a sliding manner, so that all devices on the height adjusting assembly are driven to move integrally, and compared with a common optical platform, flexible, continuous and adjustable intervals among the devices in the same plane are realized, so that normal imaging of subsequent light beams on the CCD camera 12 is ensured.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a light field generating device, its characterized in that includes laser instrument (1), beam expanding collimation subassembly (17), filter (4), first polaroid (5), binary optical grating slide (6), second polaroid (11) and CCD camera (12) that set gradually along light transmission direction, wherein, the sculpture has a plurality of stripes on binary optical grating slide (6), the central part of stripe pattern is the fork form.
2. The light field generating device as claimed in claim 1, wherein the width of the stripe is equal to the distance between two adjacent stripes.
3. The light field generation device according to claim 2, characterized in that the depth of the fringes is λ/(2n-2), where λ is the wavelength of the laser light and n is the refractive index of the binary optical grating slide (6).
4. The light field generating device as claimed in claim 1, wherein the length of a first stripe with the longest length among the plurality of stripes is twice the length of a second group of stripes adjacent to the first stripe.
5. The light field generating device as claimed in claim 4, wherein the second stripe group comprises N stripes, N being greater than or equal to 1.
6. The light field generating device according to claim 4, wherein the crossing position of the cross-shaped stripes is a half of the length of the first stripes or/and an end of the second stripe group away from the edge of the slide.
7. The light field generation device according to claim 1, wherein the binary optical grating glass (6) has a circular shape formed by etching a plurality of stripes.
8. The light field generating device according to any one of claims 1 to 7, further comprising a 4f optical assembly (19), wherein the 4f optical assembly (19) comprises a first lens (7) with a distance f, a λ/4 glass (8) cemented by 90 degrees, a second lens (9), and a grating (10) arranged in sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911052851.XA CN110827638B (en) | 2019-10-31 | 2019-10-31 | Light field generating device |
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| CN201911052851.XA CN110827638B (en) | 2019-10-31 | 2019-10-31 | Light field generating device |
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| CN110827638A true CN110827638A (en) | 2020-02-21 |
| CN110827638B CN110827638B (en) | 2024-05-07 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5160976A (en) * | 1988-11-11 | 1992-11-03 | Public Health Laboratory Service Board | Optical determination of velocity using crossed interference fringe patterns |
| CN1821883A (en) * | 2006-01-12 | 2006-08-23 | 苏州大学 | Method and device for light etching micrometer structure of smooth surface |
| CN101178484A (en) * | 2007-12-07 | 2008-05-14 | 南京大学 | Generation device of random polarization distributing vector light beam |
| CN102410500A (en) * | 2011-07-27 | 2012-04-11 | 中国科学院光电技术研究所 | Interferometer annular light source system with adjustable ring radius and ring thickness |
| CN106066541A (en) * | 2016-07-27 | 2016-11-02 | 鲁东大学 | A kind of method and device producing generalized cylindrical vector light beam |
| CN210666221U (en) * | 2019-10-31 | 2020-06-02 | 浙江浙光科技有限公司 | Light field generating device |
-
2019
- 2019-10-31 CN CN201911052851.XA patent/CN110827638B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5160976A (en) * | 1988-11-11 | 1992-11-03 | Public Health Laboratory Service Board | Optical determination of velocity using crossed interference fringe patterns |
| CN1821883A (en) * | 2006-01-12 | 2006-08-23 | 苏州大学 | Method and device for light etching micrometer structure of smooth surface |
| CN101178484A (en) * | 2007-12-07 | 2008-05-14 | 南京大学 | Generation device of random polarization distributing vector light beam |
| CN102410500A (en) * | 2011-07-27 | 2012-04-11 | 中国科学院光电技术研究所 | Interferometer annular light source system with adjustable ring radius and ring thickness |
| CN106066541A (en) * | 2016-07-27 | 2016-11-02 | 鲁东大学 | A kind of method and device producing generalized cylindrical vector light beam |
| CN210666221U (en) * | 2019-10-31 | 2020-06-02 | 浙江浙光科技有限公司 | Light field generating device |
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