CN107065488A - The laser hologram direct printer and method of a kind of use frequency domain filtering - Google Patents
The laser hologram direct printer and method of a kind of use frequency domain filtering Download PDFInfo
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- CN107065488A CN107065488A CN201710373349.3A CN201710373349A CN107065488A CN 107065488 A CN107065488 A CN 107065488A CN 201710373349 A CN201710373349 A CN 201710373349A CN 107065488 A CN107065488 A CN 107065488A
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- light modulator
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- 238000001914 filtration Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006073 displacement reaction Methods 0.000 claims abstract description 14
- 238000007639 printing Methods 0.000 claims abstract description 9
- 238000001228 spectrum Methods 0.000 claims abstract description 8
- 238000010017 direct printing Methods 0.000 claims abstract description 4
- 238000001093 holography Methods 0.000 claims abstract description 3
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 2
- 238000009738 saturating Methods 0.000 claims 1
- 230000009466 transformation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0476—Holographic printer
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Holo Graphy (AREA)
Abstract
The invention belongs to holography field, and in particular to the laser hologram direct printer and method of a kind of use frequency domain filtering.It is made up of using the laser hologram direct printer of frequency domain filtering light source, beam-expanding collimation mirror, plane mirror, spatial light modulator, the first lens, bandpass filter, the second lens, doubly telecentric camera lens, holographic recording medium, displacement platform and computer.The laser hologram method of direct printing of frequency domain filtering is used hologram fringe is changed into spectrum domain from transform of spatial domain using the first lens, separate each diffraction image, then Advanced Diffraction picture is fallen using band-pass filter, leave the frequency spectrum of diffraction image at central level, pass through the picture of the second lens reproduction central level, pass through doubly telecentric camera lens microimage to holographic recording medium again, obtain holographic cell, holographic recording medium can follow displacement platform level to height to accurate movement, the laser direct-writing printing of hologram is completed, the quality reproduction of hologram is improved.
Description
Technical field
The invention belongs to holography field, and in particular to a kind of laser hologram direct printer of use frequency domain filtering and
Method.
Background technology
The calculating holographic interference fringes that computer is obtained are loaded into after spatial light modulator, needed for being filtered out by aperture diaphragm
The diffraction time wanted, and it is miniature by the progress of doubly telecentric camera lens miniature system, interference fringe piecemeal is gradually printed into holographic note
Technology on recording medium is referred to as the direct printing technique of laser hologram.The method that this use aperture diaphragm is directly filtered needs to use
The diaphragm of large-size, system bulk is big, it has not been convenient to the system integration；Simultaneously because interference fringe carries out frequency spectrum point without lens
From and be directly over aperture diaphragm and be filtered, so diffraction phenomena can occur at the unthreaded hole edge of aperture diaphragm, it is impossible to preferably
The diffraction time of needs is filtered out, causes the decline of hologram reconstruction quality, or even the original can not be reproduced.
Interference fringe distribution is closely related on the reproduction effects and holographic recording medium of hologram, should pole in print procedure
Try hard to avoid and exempt from the interference fringe appearance unrelated with reproduction image on the holographic recording medium.For a long time, people are direct to laser hologram
Print system has carried out many improvement, it is proposed that the visual effect and reproduction image image space of a kind of raising holographic reconstructed image and
The adjustable method of size, first loads balzed grating, to phase-only hologram, secondly by superposition Convergent Laser Beam phase, separation
Reproduction image and the position of the focussing plane of multi-level diffraction light caused by spatial light modulator pixel structure, recycle diaphragm and high pass
The collective effect of wave filter, eliminates the influence of Advanced Diffraction light, multistage reproduction image and zero order light interference to reconstruct visual effect
(Shen Chuan etc., the holographic reconstructed image Study on Problems based on dot structure spatial light modulator, Acta Optica, 0309001,2011),
By comparison, device is more simple by the present invention, and carries out miniature using doubly telecentric camera lens and divided with displacement platform
Block is printed.The holographic wavefront Method of printing also used at present, allow reproduction image frequency spectrum by bandpass filter, in recording medium
Reference light is introduced below to interfere with Object light wave, records its reflection hologram (Takeshi Yamaguchi, Volume
Hologram printer to record the wavefront of three-dimensional objects, Optical
Engineering, 075802,2012), the present invention uses laser hologram and directly printed, it is not necessary to be re-introduced into reference light, letter
Experimental provision is changed.
The present invention proposes the laser hologram direct printer and method of a kind of use frequency domain filtering, with 4f systems and band logical
Wave filter is filtered to interference fringe, and Advanced Diffraction picture can be filtered out well, the quality reproduction of hologram is improved, with double
Telecentric lens carry out microrecord, and the displacement platform that computerizeds control, to accurate movement, completes complete in level to height
Cease the laser direct-writing printing of figure.
The content of the invention
It is an object of the invention to provide a kind of laser hologram direct printer of use frequency domain filtering and method, to avoid
Influence of the Advanced Diffraction picture to hologram reconstruction, while carrying out microrecord with doubly telecentric camera lens, and computerizeds control
Displacement platform, to accurate movement, completes the laser direct-writing printing of hologram, improves the reproduction matter of hologram in level to height
Amount.
It is a feature of the present invention that using the laser hologram direct printer of frequency domain filtering, at least containing light source, expanding
Collimating mirror, plane mirror, spatial light modulator, the first lens, bandpass filter, the second lens, doubly telecentric camera lens, holographic note
Record dry plate, displacement platform and computer.Wherein, computer is both transmitted to spatial light modulator load image, and to displacement platform
Control signal.Spatial light modulator is at the front focal plane of the first lens, and bandpass filter is in the back focal plane of the first lens and second
At the front focal plane of lens, holographic recording medium is at the blur-free imaging face of doubly telecentric camera lens and is fixed on displacement platform, space
Optical modulator is at the front focal plane of the first lens, and bandpass filter is in the back focal plane of the first lens and the front focal plane of the second lens
Place, affiliated spatial light modulator, the first lens, bandpass filter, the second lens constitute 4f systems.Bandpass filter can be filtered
Fall Advanced Diffraction picture, allow central diffraction image to carry out micro by doubly telecentric camera lens and be delivered on holographic recording medium, and use tricks
Calculation machine command displacement platform carries out piecemeal printing.
Using the device, the method that completion laser hologram is directly printed is：One image is loaded onto space using computer
Optical modulator, light source produces light beam, after beam-expanding collimation mirror beam-expanding collimation, adjusts the angle of plane mirror, shines the light beam
Spatial light modulator is penetrated, spatial light modulator will produce the multiorder diffractive picture of image, obtain many on the first lens back focal plane
The frequency spectrum of order diffraction picture, bandpass filter is placed in the frequency plane, only can be by the frequency spectrum of diffraction image at central level；Bandpass filter
Simultaneously on the front focal plane of the second lens, the picture of reproducing center level on the second lens back focal plane, then by doubly telecentric
Camera lens thumbnail image obtains holographic cell to holographic recording medium, holographic recording medium can follow displacement platform level to
Height completes the laser direct-writing printing of hologram to accurate movement.
The laser hologram direct printer for the use frequency domain filtering that the present invention is provided is simple in construction, and Method of printing is accurately high
Effect.
Brief description of the drawings
Implement illustration：
The laser hologram direct printer for the use frequency domain filtering that the present invention is provided and the accompanying drawing of method have 2
Fig. 1 uses the structural representation of the laser hologram direct printer of frequency domain filtering and one embodiment of method
Figure.
Fig. 2 uses the structural representation of the laser hologram direct printer of frequency domain filtering and second embodiment of method
Figure.
In Fig. 1~2, (1)-light source, (2)-beam-expanding collimation mirror, (3)-plane mirror, (4)-spatial light modulator, (5)-
First lens, (6)-bandpass filter, (7)-the second lens, (8)-doubly telecentric camera lens, (9)-holographic recording medium, (10)-position
Move platform, (11)-computer.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention " using frequency
The laser hologram direct printer and method of domain filtering " embodiment is described in further detail.
The knot of the laser hologram direct printer for the use frequency domain filtering that Fig. 1 provides for the present invention and the embodiment of method
Structure schematic diagram, including light source (1), beam-expanding collimation mirror (2), plane mirror (3), spatial light modulator (4), the first lens (5),
Bandpass filter (6), the second lens (7), doubly telecentric camera lens (8), holographic recording medium (9), displacement platform (10), computer
(11)。
In this embodiment, the monochromatic red laser light source of light source (1) selection, the light source is produced after light beam, through beam-expanding collimation
After mirror (2) beam-expanding collimation, the angle of regulation plane mirror (3) makes the light beam irradiate spatial light modulator (4).Utilize calculating
One holographic interference fringes are loaded onto spatial light modulator (4) by machine, and spatial light modulator (4) will produce the multiorder diffractive of image
Picture.
The pixel count of spatial light modulator is M × M, and pel spacing is Δ d, and the length of side in Pixel actuation area is d, then spatial light
The transmittance function of modulator can be expressed as：
(1) rect is rectangular function in formula.
Wherein a (x, y) is SLM aperture function,For the phase distribution for the behaviour area for being loaded into SLM,For the non-of SLM
Constant phase caused by behaviour area (dead band) is offset,Represent convolution algorithm.
During by the first lens, the COMPLEX AMPLITUDE T (u, v) of reconstruction plane is SLM transmittance function t (x, y) Fu
In leaf transformation, be represented by
(5) in formula
A (u, v)=F { a (x, y) } (6)
W (u, v)={ d2Sinc (ud, vd) Q (u, v)+[Δ d2Sinc (u Δs d, v Δ d)-d2Sinc (ud, vd)] P (u,
v)} (8)
Wherein F { } represents Fourier transformation, and two-dimensional function Q (u, v) represents the Fourier of the phase hologram through over-sampling
Conversion, represents Fourier transformation of the sampling interval for Δ d discrete topology SLM.
Advanced Diffraction picture is filtered by bandpass filter
Wherein Δ SL=λ f/ Δs d, λ are wavelength, and f is focal length.
G (u, v)=T (u, v) H (u, v) (12)
Complex amplitude is after the second lens carry out Fourier transformation：
Wherein t*For t complex conjugate
Finally obtained hologram fringe is delivered on holographic recording medium by the progress of doubly telecentric camera lens is miniature, obtains complete
Interest statement member, holographic recording medium follows displacement platform, to accurate movement, to complete the laser direct-writing of hologram to height in level
Printing.
Second reality of the apparatus and method that the laser hologram for the use frequency domain filtering that Fig. 2 provides for the present invention is directly printed
The structural representation of example is applied, its concrete structure is similar to one embodiment, its implementation principle and the first embodiment of the present invention
It is identical.But in this embodiment, employ transmissive space light modulator.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (5)
1. a kind of laser hologram direct printer of use frequency domain filtering, it is characterised in that corresponding device includes：Light source (1),
It is beam-expanding collimation mirror (2), plane mirror (3), spatial light modulator (4), the first lens (5), bandpass filter (6), second saturating
Mirror (7), doubly telecentric camera lens (8), holographic recording medium (9), displacement platform (10) and computer (11), along light beam direction of advance,
It is the beam-expanding collimation mirror (2), the plane mirror (3), the spatial light modulator (4), first lens (5), described
Bandpass filter (6), second lens (7), the doubly telecentric camera lens (8), the holographic recording medium (9), the displacement
Platform (10) and the computer (11) are successively set in the light path of the light source (1)；The computer (11) is both to described
Spatial light modulator (4) load image, and transmit control signal to institute's translation stage (10)；The doubly telecentric camera lens (8) exists
In the range of working distance after second lens (7), the holographic recording medium (9) is clear the doubly telecentric camera lens (8)
At imaging surface and it is fixed on institute's translation stage (10).
2. as claimed in claim 1 using the laser hologram direct printer of frequency domain filtering, it is characterised in that the space
Optical modulator (4) is at the front focal plane of first lens (5), and the bandpass filter (6) is after first lens (5)
At the front focal plane of focal plane and second lens (7), affiliated spatial light modulator (4), the first lens (5), bandpass filter
(6), the second lens (7), which constitute 4 systems, is used for the filtering that laser hologram is directly printed.
3. as claimed in claim 1 using the laser hologram direct printer of frequency domain filtering, it is characterised in that the space
Reflection-type or transmissive spatial light modulator may be selected in optical modulator (4).
4. a kind of laser hologram method of direct printing of use frequency domain filtering, it is characterised in that utilize one described in claim 1
The step of planting the laser hologram direct printer realization using frequency domain filtering, methods described includes：
One holographic interference fringes are loaded onto the spatial light modulator (4), the spatial light modulator (4) is placed on described
On one lens (5) front focal plane, laser irradiates the spatial light modulator (4), and the spatial light modulator (4) can produce multistage and spread out
Image；
The frequency spectrum of multiorder diffractive picture is obtained on the first lens (5) back focal plane, the bandpass filtering is placed in the frequency plane
Device (6), only can be by the frequency spectrum of central level diffraction image；
The bandpass filter (6) is burnt afterwards in second lens (7) while on the front focal plane of second lens (7)
The picture of reproducing center level on face, then, to holographic recording medium, obtain holography by doubly telecentric camera lens (8) thumbnail image
Unit, the holographic recording medium (9) can follow institute's translation stage (10), to accurate movement, to complete complete to height in level
Cease the laser direct-writing printing of figure.
5. as claimed in claim 4 using the laser hologram method of direct printing of frequency domain filtering, it is characterised in that this method
Core is that the Advanced Diffraction picture after being projected using the bandpass filter (6) to the spatial light modulator (4) is filtered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710373349.3A CN107065488A (en) | 2017-05-18 | 2017-05-18 | The laser hologram direct printer and method of a kind of use frequency domain filtering |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490948A (en) * | 2017-09-26 | 2017-12-19 | 天津工业大学 | A kind of adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field |
| CN109799666A (en) * | 2019-03-12 | 2019-05-24 | 深圳大学 | A kind of holographic projector and holographic projection methods |
| WO2019170036A1 (en) * | 2018-03-06 | 2019-09-12 | The Chinese University Of Hong Kong | Ultrafast Laser Fabrication Method and System |
| CN114859679A (en) * | 2022-04-19 | 2022-08-05 | 华中科技大学 | Holographic wavefront printing system and method |
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| CN101487975A (en) * | 2009-02-18 | 2009-07-22 | 潍坊学院 | Production method for theta modulating holographic grating |
| CN103246195A (en) * | 2013-05-08 | 2013-08-14 | 苏州苏大维格光电科技股份有限公司 | 3D laser printing method and system |
| CN106647213A (en) * | 2017-01-19 | 2017-05-10 | 中国人民解放军装甲兵工程学院 | Precision positioning device and method of dry plate for laser holographic direct printing |
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2017
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Patent Citations (3)
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|---|---|---|---|---|
| CN101487975A (en) * | 2009-02-18 | 2009-07-22 | 潍坊学院 | Production method for theta modulating holographic grating |
| CN103246195A (en) * | 2013-05-08 | 2013-08-14 | 苏州苏大维格光电科技股份有限公司 | 3D laser printing method and system |
| CN106647213A (en) * | 2017-01-19 | 2017-05-10 | 中国人民解放军装甲兵工程学院 | Precision positioning device and method of dry plate for laser holographic direct printing |
Non-Patent Citations (1)
| Title |
|---|
| HOONJONG KANG等: "Comparison of system properties for wave-front holographic printers", 《SPEINGER –VERLAG BERLIN HEIDELBERG》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490948A (en) * | 2017-09-26 | 2017-12-19 | 天津工业大学 | A kind of adjustable phase type hologram type method for rebuilding the three-dimensional scenic angle of visual field |
| WO2019170036A1 (en) * | 2018-03-06 | 2019-09-12 | The Chinese University Of Hong Kong | Ultrafast Laser Fabrication Method and System |
| CN111819500A (en) * | 2018-03-06 | 2020-10-23 | 香港中文大学 | Ultrafast laser manufacturing method and system |
| CN111819500B (en) * | 2018-03-06 | 2022-06-07 | 香港中文大学 | Ultrafast laser manufacturing method and system |
| CN109799666A (en) * | 2019-03-12 | 2019-05-24 | 深圳大学 | A kind of holographic projector and holographic projection methods |
| CN114859679A (en) * | 2022-04-19 | 2022-08-05 | 华中科技大学 | Holographic wavefront printing system and method |
| CN114859679B (en) * | 2022-04-19 | 2022-12-20 | 华中科技大学 | Holographic wavefront printing system and method |
| WO2023202020A1 (en) * | 2022-04-19 | 2023-10-26 | 华中科技大学 | Holographic wavefront printing system and method |
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Application publication date: 20170818 |