CN110196545A - Hololens 4f optical system based on holographic optical elements (HOE) - Google Patents
Hololens 4f optical system based on holographic optical elements (HOE) Download PDFInfo
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- CN110196545A CN110196545A CN201910461061.0A CN201910461061A CN110196545A CN 110196545 A CN110196545 A CN 110196545A CN 201910461061 A CN201910461061 A CN 201910461061A CN 110196545 A CN110196545 A CN 110196545A
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- hololens
- holographic
- dry plate
- plane wave
- holographic dry
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- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000012805 post-processing Methods 0.000 claims description 5
- 230000021615 conjugation Effects 0.000 claims 1
- 238000001228 spectrum Methods 0.000 abstract description 9
- 238000005286 illumination Methods 0.000 abstract description 7
- 230000009466 transformation Effects 0.000 abstract description 4
- 238000001093 holography Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010425 computer drawing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000758 substrate Substances 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
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
-
- 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
-
- 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
- G03H1/16—Processes or apparatus for producing holograms using Fourier transform
-
- 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
- G03H1/0443—Digital holography, i.e. recording holograms with digital recording means
- G03H2001/045—Fourier or lensless Fourier arrangement
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Holo Graphy (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The hololens 4f optical system based on holographic optical elements (HOE) that the invention discloses a kind of, the system mainly by with fourier lense function hololens 1 and hololens 2 form, by placed between hololens 1 and hololens 2 suitable filter to input plane wave signal carry out space filtering.Within the system, input plane wave is in θ angle oblique illumination to hololens 1, the spatial frequency spectrum of input plane wave is obtained in its focal plane after the Fourier transformation of hololens 1, the spatial frequency spectrum of input plane wave is filtered by placing suitable filter in the focal plane of hololens 1, plane wave and with θ angle inclined output required for filtered spatial frequency spectrum is obtained using the inverse Fourier transform of hololens 2, to realize the space filtering function of the system.
Description
Technical field
The present invention relates to holographic optical elements (HOE) recording technique, hololens and 4f optical systems, in particular to based on holography
The hololens 4f optical system of optical element.
Background technique
With the rapid development of computer technology and electro-optical modulation device, calculates holographic 3D display and also obtain huge dash forward
It is broken, it is more and more that the holographic research in terms of the holographic 3D display of wear-type augmented reality (AR) is calculated especially in recent years.It calculates complete
Breath is the dry hologram penetrated principle and utilize computer drawing object based on light, is then loaded using spatial light modulator holographic
Figure, and the diffraction principle based on light realizes that holography 3D reproduces.The gray value of hologram can make corresponding in spatial light modulator
Each pixel unit generates different phases.Therefore, when on collimated laser light to spatial light modulator, spatial light modulator
The phase of the light of each pixel unit is modulated, thus reproducing 3D rendering in space.But due to space light modulation
Device has discretization dot structure, and when reproduction can have multiorder diffractive picture.Therefore, in order to eliminate other level diffraction images, usually
Way is filtered using 4f optical system, to eliminate the reproduction 3D rendering for not needing level.Traditional 4f optical system
The general convex lens for using glass material, processing cost is high and weight is big, is unfavorable for the light weight of wear-type AR holography 3D display
Change and integrated.
Summary of the invention
To solve the problems, such as the lightweight of wear-type AR holography 3D display and integrated, the present invention is proposed based on holographic optics member
The hololens 4f optical system of part, the system mainly by with fourier lense function hololens 1 and 2 groups of hololens
At, space filtering is carried out to input plane wave signal by placing suitable filter between hololens 1 and hololens 2,
The structure of the system is as shown in Fig. 1.Within the system, input plane wave is to pass through in θ angle oblique illumination to hololens 1
It crosses after the Fourier transformation of hololens 1 and obtains the spatial frequency spectrum of input plane wave in its focal plane, by hololens 1
Focal plane place suitable filter the spatial frequency spectrum of input plane wave be filtered, filtered spatial frequency spectrum
Plane wave and with θ angle inclined output required for being obtained using the inverse Fourier transform of hololens 2, to realize this
The space filtering function of system.
The production method of the hololens 1 with fourier lense function is as shown in Fig. 2, and plane wave I passes through Fu
In leaf lens become assemble spherical wave and vertical irradiation to holographic dry plate 1 on, at this time holographic dry plate 1 be close to fourier lense；
Then plane wave II is the other way around to carry out holographic exposure, note to holographic dry plate 1 in θ angle oblique illumination to holographic dry plate 1
The interference fringe for recording lower two light waves, is just made hololens 1 using post-processing after the completion of exposure.
The production method of the hololens 2 with fourier lense function is as shown in Fig. 3, and plane wave I passes through Fu
In leaf lens become Convergent Laser Beam, it is total to become phase when at the two focus length that this Convergent Laser Beam travels to fourier lense
The divergent spherical wave of yoke, and holographic dry plate 2 is placed here, make on divergent spherical wave vertical irradiation to holographic dry plate 2；Plane wave
Then II is the other way around to carry out holographic exposure to holographic dry plate 2, record two in θ angle oblique illumination to holographic dry plate 2
Hololens 2 is just made using post-processing after the completion of exposure in the interference fringe of light wave.
Detailed description of the invention
Attached drawing 1 is the structural schematic diagram of the hololens 4f optical system based on holographic optical elements (HOE)
Attached drawing 2 is 1 schematic diagram of manufacturing method of hololens with fourier lense function
Attached drawing 3 is 2 schematic diagram of manufacturing method of hololens with fourier lense function
Shown by reference numeral in above-mentioned attached drawing are as follows:
(1) hololens 1；(2) hololens 2；(3) plane wave I；(4) plane wave II；(5) Convergent Laser Beam；(6) ball is dissipated
Surface wave；(7) input plane wave；(8) output plane wave；(9) fourier lense；(10) holographic dry plate 1；(11) holographic dry plate 2；
(12) focal plane of hololens 1；(13) filter.
It should be understood that above-mentioned attached drawing is only schematical, it is not drawn to draw.
Specific embodiment
Implement the following detailed description of one the present invention is based on the hololens 4f optical system of holographic optical elements (HOE) is typical
Example, is further described specifically the present invention.It is necessarily pointed out that following embodiment be served only for the present invention do into
The explanation of one step, should not be understood as limiting the scope of the invention, and field person skilled in the art is according to aforementioned present invention
Content makes some nonessential modifications and adaptations to the present invention, still falls within protection scope of the present invention.
Hololens 4f optical system proposed by the present invention based on holographic optical elements (HOE), the system is mainly by in Fu
The hololens 1 and hololens 2 of leaf lens function form, by placing suitable filter between hololens 1 and hololens 2
Wave device carries out space filtering to input plane wave signal, and the structure of the system is as shown in Fig. 1.In hololens 4f optical system
In system, input plane wave is in the angle oblique illumination to hololens 1 of θ=45 °, after the Fourier transformation of hololens 1
The spatial frequency spectrum of input plane wave is obtained in its focal plane, suitable filtering is placed by the focal plane in hololens 1
Device is filtered the spatial frequency spectrum of input plane wave, filtered spatial frequency spectrum using hololens 2 Fourier
Inverse transformation obtains required plane wave and with θ=45 ° angle inclined output, to realize hololens 4f optical system
Space filtering function.
Device needed for the present embodiment production has the hololens of fourier lense function has laser, electronic shutter, sky
Between filter, beam splitter, collimation lens, reflecting mirror, diaphragm, fourier lense and holographic dry plate.Light used in the present embodiment
Source is green solid-state lasers, model MSL-FN-532-S, wavelength 532nm, power 400mW；The object of spatial filter
Mirror amplification factor be 60 ×, pinhole diameter Ф1=25um；Beam splitter splitting ratio is 1:1；The diameter of collimation lens is Ф2=
100mm, focal length F=170mm；Aperture stop size is 50mm × 50mm；The diameter of fourier lense is Ф3=75mm, focal length f
=100mm；Holographic dry plate is made on the transparent substrate of the coating of photopolymer material, the sensitive wave length of photopolymer material
For λ=532nm, polymer thickness is h=15 ± 1um, and Refractive Index of Material n=1.47, refractive index modulation degree is Δ n > 0.02,
Luminous sensitivity is 10mJ/cm2。
The production method of hololens 1 described in the present embodiment with fourier lense function is as shown in Fig. 2, plane wave
I becomes on Convergent Laser Beam and vertical irradiation to holographic dry plate 1 after fourier lense, and holographic dry plate is close to Fourier at this time
Lens；Then plane wave II is the other way around to carry out holographic dry plate 1 in the angle oblique illumination to holographic dry plate 1 of θ=45 °
Holographic exposure records the interference fringe of two light waves, and hololens 1 is just made using post-processing after the completion of exposure, obtained
The size of hololens 1 is 50mm × 50mm；Focal length is f1=100mm.
The production method of hololens 2 described in the present embodiment with fourier lense function is as shown in Fig. 3, plane wave
I becomes Convergent Laser Beam by fourier lense, the time-varying at the two focus length that this Convergent Laser Beam is transmitted to fourier lense
At the divergent spherical wave that phase is conjugated, and holographic dry plate 2 is placed here, make divergent spherical wave vertical irradiation to holographic dry plate 2
On；Then plane wave II is the other way around to carry out full holographic dry plate 2 in the angle oblique illumination to holographic dry plate 2 of θ=45 °
Breath exposure, records the interference fringe of two light waves, and hololens 2 is just made using post-processing after the completion of exposure, obtained complete
The size for ceasing lens 2 is 50mm × 50mm；Focal length is f2=100mm.
Claims (3)
1. the hololens 4f optical system based on holographic optical elements (HOE), which is characterized in that the system is mainly by with Fourier
The hololens 1 and hololens 2 of lens function form, by placing suitable filtering between hololens 1 and hololens 2
Device carries out space filtering to input plane wave signal.
2. the hololens 4f optical system according to claim 1 based on holographic optical elements (HOE), which is characterized in that have
The production method of the hololens 1 of fourier lense function are as follows: plane wave I becomes the spherical wave assembled simultaneously by fourier lense
On vertical irradiation to holographic dry plate 1, holographic dry plate 1 is close to fourier lense at this time；Plane wave II is inclined the other way around with θ angle
The setting sun is mapped on holographic dry plate 1, is then exposed to holographic dry plate 1, the interference fringe of two light waves is recorded, after the completion of exposure
Hololens 1 is just made using post-processing.
3. the hololens 4f optical system according to claim 1 based on holographic optical elements (HOE), which is characterized in that have
The production method of the hololens 2 of fourier lense function are as follows: plane wave I becomes Convergent Laser Beam by fourier lense, when
This Convergent Laser Beam becomes the divergent spherical wave of phase conjugation when being transmitted at the two focus length of fourier lense, and puts here
Holographic dry plate 2 is set, is made on divergent spherical wave vertical irradiation to holographic dry plate 2；Plane wave II, which is tilted the other way around with θ angle, to be shone
It is mapped on holographic dry plate 2, then holographic dry plate 2 is exposed, record the interference fringe of two light waves, passed through again after the completion of exposure
Later it handles and hololens 2 is just made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910461061.0A CN110196545A (en) | 2019-05-30 | 2019-05-30 | Hololens 4f optical system based on holographic optical elements (HOE) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910461061.0A CN110196545A (en) | 2019-05-30 | 2019-05-30 | Hololens 4f optical system based on holographic optical elements (HOE) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110196545A true CN110196545A (en) | 2019-09-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910461061.0A Pending CN110196545A (en) | 2019-05-30 | 2019-05-30 | Hololens 4f optical system based on holographic optical elements (HOE) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110196545A (en) |
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2019
- 2019-05-30 CN CN201910461061.0A patent/CN110196545A/en active Pending
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Application publication date: 20190903 |