CN108803293A - Calculate holographic reproduction light path system - Google Patents
Calculate holographic reproduction light path system Download PDFInfo
- Publication number
- CN108803293A CN108803293A CN201710314446.5A CN201710314446A CN108803293A CN 108803293 A CN108803293 A CN 108803293A CN 201710314446 A CN201710314446 A CN 201710314446A CN 108803293 A CN108803293 A CN 108803293A
- Authority
- CN
- China
- Prior art keywords
- ccd
- path system
- light path
- light
- polarizer
- 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
- 238000001093 holography Methods 0.000 claims abstract description 5
- 230000010287 polarization Effects 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000005210 holographic interferometry Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
- G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2294—Addressing the hologram to an active spatial light modulator
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holo Graphy (AREA)
Abstract
It is proposed by the present invention to calculate holographic reproduction light path system, it is related to holography field, line polarisation is exported by 405nm lasers, it expands and is completed by the filter that 40 times of microcobjective and 15 μm of pin holes form, then parallel through the polarizer after the collimating mirror collimation that focal length is 300, adjusting the angle of the polarizer keeps the polarization state of incident light consistent with spatial light modulator, then by being loaded with the SLM of computed hologram after, diffraction light passes through fourier lense, on back focal plane zero level bias light is filtered with high-pass filter, final image is finally received by CCD and is stored in computer.
Description
Technical field
The present invention relates to holography fields, especially calculate holographic reproduction light path system.
Background technology
Calculate holographic technique inspired from space filtering, and with computer, mathematics, space stroll modulator etc. its
The fast development of his related field and fast development is got up.The complete of known existing object can not only be recorded by calculating holographic technique
Portion's information can also record all information of dummy object, therefore have very powerful advantage.Holographic technique is calculated in two peacekeepings
The fields such as display, space filtering, Holographic Interferometry, the data-storing of 3-D view are widely used.
Invention content
It is provided by the invention to calculate holographic reproduction light path system, it is former when Fourier transformation computed hologram reproduces to eliminate
Begin as the aliasing with conjugate image.
The present invention specifically adopts the following technical scheme that realization：
It is a kind of to calculate holographic reproduction light path system, line polarisation is exported by 405nm lasers, is expanded by 40 times of micro- object
The filter of mirror and 15 μm of pin hole compositions is completed, and is then adjusted parallel through the polarizer after the collimating mirror collimation that focal length is 300
The angle of the section polarizer keeps the polarization state of incident light consistent with spatial light modulator, then by being loaded with computed hologram
After SLM, diffraction light passes through fourier lense, filters zero level bias light with high-pass filter on back focal plane, is finally received by CCD
Final image is simultaneously stored in computer.
Preferably, the laser is the semiconductor laser of Toptica Photonics AG companies.
Preferably, the SLM selects model GCI-7701, liquid crystalline type is Sony TFT-LCD transmission-type liquid
Crystalline substance, the CCD select DCam130M type CCD, the CCD that can use USB2.0 access hosts.
Provided by the invention to calculate holographic reproduction light path system, advantage is：Image reconstruction works well, and has
Eliminate influence of the aliasing of original image and conjugate image to Reconstructed Image Quality to effect.
Description of the drawings
Fig. 1 is collimating and beam expanding system schematic diagram；
Fig. 2 is to calculate holographic reproduction light path system schematic diagram；
Fig. 3 is experiment reproduction image schematic diagram；
Fig. 4 is that 100 width figures are averaged noise reduction schematic diagram.
Specific implementation mode
To further illustrate that each embodiment, the present invention are provided with attached drawing.These attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be coordinated to explain the operation principles of embodiment.Cooperation ginseng
These contents are examined, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention.In figure
Component be not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
In conjunction with the drawings and specific embodiments, the present invention is further described.
Detour phase encoding and modified off-axis, which refer to the coding of optical oomputing holography, to be calculated by Fourier transformation
The frequency spectrum of object function, is then encoded again.So its reproduction optical system need to carry out one by Fourier transform lens to it
Secondary inverse Fourier transform, hologram are located at receiving screen on Fourier transform lens front focal plane and back focal plane.It is simultaneously side
Just experimentation, the hologram for selecting the mode of SLM load computed holograms to be printed instead of contracting version, and utilize high-pass filtering
The zero level hot spot that device filtering appts are brought replaces optical screen to receive reproduction image with CCD.In general, sending out light beam in laser
When output, since the defect or surrounding of optical mirror plane have dust, light can be made to occur diffraction, and with light wave phase that diffraction does not occur
As a result mutually interference can occur some local speckles on laser facula, influence the uniformity of hot spot, applied in this way to laser beam
In be unfavorable, then select the collimating and beam expanding system being made of beam expanding lens 2, pinhole filter and lens 3 (such as Fig. 1 institutes
Show), it can effectively shaping light beam.Focus keeps stringent with the front focus of lens and overlaps after beam expanding lens, and pin hole swashs in overlapping position
The light beam that light device is sent out is focused on by beam expanding lens on pinhole filter, and radio-frequency component is then filtered out by pin hole, only parallel optical axis
Light by pin hole, then by lens by beam shaping be uniform major diameter collimated light beam.
So as shown in Fig. 2, the present embodiment proposes a kind of reproduction light path system calculating holography, by 405nm lasers 1
Line polarisation is exported, the filter 2 being made of 40 times of microcobjective and 15 μm of pin holes is expanded and completes, it is 300 then to pass through focal length
Collimating mirror 3 collimate after parallel through the polarizer 4, adjusting the angle of the polarizer makes the polarization state and spatial light modulator of incident light
5 is consistent, then by being loaded with the SLM of computed hologram after, diffraction light passes through fourier lense 6, and high pass is used on back focal plane
Filter 7 filters zero level bias light, finally receives final image by CCD and is stored in computer.
The light source that the present embodiment uses is the semiconductor laser of Toptica Photonics AG companies, the laser body
Product is small, is easily installed, debugs light path.Its wavelength is 405nm, peak power output 120mW, and power, polarization state etc. are equal
Can be by computer On-line Control, and it is equipped with Sub-miniature B, the fluorescent lifetime of laser can be directly driven with Transistor-Transistor Logic level.
It loads and replaces contracting version printed holograms in computed hologram to SLM to realize the reproduction of computed hologram, such one
Cost has not only been saved, but also has been conveniently operated, can be repeated several times experiment.Its model of SLM GCI- that the present embodiment is selected
7701, liquid crystalline type is Sony TFT-LCD transmission liquid crystals, and display speed is 60Hz, and inter-pixel is away from being 26 μm, pixel number
It is 1024 × 768, image planes size is 26.624 × 19.968 (mm).
The present embodiment can use USB2.0 access hosts using DCam130M type CCD, the CCD, therefore not need image pick-up card
It is relayed and is converted, simple can provide power supply, image transmitting and camera control operation by USB2.0, apply non-
It is often convenient.Its sensor type be CMOS, resolution ratio be 1280 (H) × 1024 (V), effectively as face size be 6.660 ×
5.320 (mm), single picture dot size are 5.2 × 5.2 (μm), are exported as 8 black and white, and power is less than 450mW, and operating temperature is 0
DEG C between 70 DEG C.
The computed hologram made is loaded by computer in SLM, reproduction image is received by CCD, due to CCD visual fields
It is limited, it is not received by other diffraction images as caused by spatial light modulator pixel structure.Experimental result is as shown in figure 3, by scheming
As can be seen that the separation that original image and conjugate image will may be implemented in the full null matrix of original sample point write-in 600*600.
The speckle noise of reproduction image is very big as seen from Figure 3, this is because the random phase factor and Experimental Hardware light path
Caused by the random noise that system is brought.The method that several unifications can be used carries out noise reduction process, i.e., computed hologram exists
Accurately the period translates two-dimensional directional, when reproducing the new hologram synthesized by several holograms with collimation laser illumination in this way,
According to the translation invariance of Fourier transformation, just make the reproduction image of single holographic figure that can accurately be superimposed, to carry out
Multiple image is averaged, and achievees the purpose that reduce speckle noise.But size can become after the hologram after periodic extension
It is very big, and the size of spatial light modulator is limited, SLM cannot load all holograms after translation in experiment, use here
Matlab carrys out the reproduction image additive process for 100 width holograms being continuously shot in simulated experiment, to verify the feasible of this method
Property.Simulation result is as shown in figure 4, the speckle noise of reproduction image is largely inhibited.Compared by analysis, finally
Reproduction image show result be consistent with theory analysis.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
In vain, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (3)
1. a kind of calculating holographic reproduction light path system, which is characterized in that export line polarisation by 405nm lasers, expand by 40
The filter of microcobjective again and 15 μm of pin holes compositions is completed, then parallel after the collimating mirror collimation that focal length is 300 to lead to
The polarizer is crossed, adjusting the angle of the polarizer keeps the polarization state of incident light consistent with spatial light modulator, then by being loaded with meter
After the SLM for calculating hologram, diffraction light passes through fourier lense, filters zero level bias light with high-pass filter on back focal plane, most
Final image is received by CCD afterwards and is stored in computer.
2. a kind of holographic reproduction light path system is calculated according to claim 1, which is characterized in that the laser is
The semiconductor laser of Toptica Photonics AG companies.
3. a kind of reproduction light path system calculating holography according to claim 1, which is characterized in that the SLM selections type
Number it is GCI-7701, liquid crystalline type is Sony TFT-LCD transmission liquid crystals, and the CCD selects DCam130M type CCD, should
CCD can use USB2.0 access hosts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710314446.5A CN108803293A (en) | 2017-05-06 | 2017-05-06 | Calculate holographic reproduction light path system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710314446.5A CN108803293A (en) | 2017-05-06 | 2017-05-06 | Calculate holographic reproduction light path system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108803293A true CN108803293A (en) | 2018-11-13 |
Family
ID=64054888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710314446.5A Pending CN108803293A (en) | 2017-05-06 | 2017-05-06 | Calculate holographic reproduction light path system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108803293A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731656A (en) * | 2021-01-13 | 2021-04-30 | 上海昊量光电设备有限公司 | Zero-order light filtering light path of liquid crystal spatial light modulator |
| CN114061769A (en) * | 2021-11-19 | 2022-02-18 | 江苏科技大学 | Device and method for measuring laser wavelength based on coaxial holographic self-focusing technology |
| CN114460735A (en) * | 2022-01-17 | 2022-05-10 | 中国科学院上海光学精密机械研究所 | Microscopic imaging device and method based on wavefront correction of spatial light modulator |
| CN115268242A (en) * | 2022-08-01 | 2022-11-01 | 南昌航空大学 | Large-visual-angle holographic three-dimensional display system |
-
2017
- 2017-05-06 CN CN201710314446.5A patent/CN108803293A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731656A (en) * | 2021-01-13 | 2021-04-30 | 上海昊量光电设备有限公司 | Zero-order light filtering light path of liquid crystal spatial light modulator |
| CN114061769A (en) * | 2021-11-19 | 2022-02-18 | 江苏科技大学 | Device and method for measuring laser wavelength based on coaxial holographic self-focusing technology |
| CN114061769B (en) * | 2021-11-19 | 2024-02-27 | 江苏科技大学 | Method for measuring laser wavelength based on coaxial digital holographic self-focusing technology |
| CN114460735A (en) * | 2022-01-17 | 2022-05-10 | 中国科学院上海光学精密机械研究所 | Microscopic imaging device and method based on wavefront correction of spatial light modulator |
| CN115268242A (en) * | 2022-08-01 | 2022-11-01 | 南昌航空大学 | Large-visual-angle holographic three-dimensional display system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Blinder et al. | Signal processing challenges for digital holographic video display systems | |
| TW542946B (en) | Improvements to acquisition and replay system for direct-to-digital holography and holovision | |
| CN108803293A (en) | Calculate holographic reproduction light path system | |
| JP4294526B2 (en) | Digital holography apparatus and image reproduction method using digital holography | |
| CN108055867A (en) | Display system | |
| CN102073264B (en) | Time-sharing multiplexing computational holographic three-dimensional display system and display method thereof | |
| US10228655B2 (en) | Incoherent fluorescence digital holographic microscopy using transmission liquid crystal lens | |
| BRPI0612442A2 (en) | imaging device and method for reconstructing scenes with video holograms | |
| JP7122153B2 (en) | Hologram recording device and image reproducing device | |
| CN105717774A (en) | Real-time recording apparatus and method for colorful digital holographic image | |
| CN106950811B (en) | A kind of digital composite holographic imaging method and device | |
| KR20180063835A (en) | Hologram image reconstruction using modified optical neural networks | |
| Kelly et al. | Digital holographic capture and optoelectronic reconstruction for 3D displays | |
| JP3798511B2 (en) | Computer generated hologram display | |
| CN104166336A (en) | Spatial conversion method of three-dimensional holographic colors | |
| JP2017076038A (en) | Digital holography device and digital holography method | |
| CN101452251A (en) | Record system for colorful digital holographic image | |
| US11314204B2 (en) | Holographic reconstruction apparatus and method | |
| CN1088681A (en) | Real-time one step double-wavelength holographic interference checking device | |
| KR101170896B1 (en) | Module device for digital hologram microscope | |
| CN113376993A (en) | Virtual point spread function recording method for coded aperture correlation holography | |
| US11378916B2 (en) | Holographic display method and holographic display device | |
| Zhang et al. | Incoherent frequency-selective phase coded holography and axial overlap information stripping | |
| CN203365934U (en) | Angle multiplexing double rainbow holographic recording device | |
| JP6762063B2 (en) | Optical measuring device and optical measuring method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181113 |
|
| WD01 | Invention patent application deemed withdrawn after publication |