CN109799688A - A kind of optics module, image recording structure and its working method - Google Patents
A kind of optics module, image recording structure and its working method Download PDFInfo
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- CN109799688A CN109799688A CN201910171179.XA CN201910171179A CN109799688A CN 109799688 A CN109799688 A CN 109799688A CN 201910171179 A CN201910171179 A CN 201910171179A CN 109799688 A CN109799688 A CN 109799688A
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Abstract
The present invention provides a kind of optics module, image recording structure and its working method, wherein optics module includes: light source, and the light source is for issuing laser；Beam expander, for being expanded to the laser；Liquid crystal light modulator, positioned at the light emission side of the beam expander, the coherent light for issuing the beam expander is modulated to partially coherent light.A kind of optics module, image recording structure and its working method provided by the invention can be improved the quality and resolution ratio of the hologram image of image recording structure record.
Description
Technical field
The present invention relates to optical technical field more particularly to a kind of optics modules, image recording structure and its working method.
Background technique
Hologram technology (Holographic display) is to record using the interference and diffraction principle of light and reproduce object
The record of the true 3-D image of body and the technology of reproduction.Holography is issued using laser as lighting source, and by light source
Light be divided into two bundles, a branch of to be emitted directly toward sensitive film, another beam directive sensitive film again after the reflection of object.Two-beam is being felt
Superposition generates interference on mating plate, is finally further processed using the hologram that digital picture basic principle reproduces, removes divisor
Word interference, obtains clearly hologram image.Hologram technology be expected to three-dimensional film, exhibition, microscopy, interference metrology,
The various aspects such as the precious reproduction of history relic, the art work of projection lithography, military surveillance monitoring, preservation are applied.
In the prior art, record uses coherent source with when reproducing hologram, therefore is inevitably present relevant effect
Answer caused speckle noise.Speckle effect reduces the quality of holographic images, while limiting the resolution ratio of holophotal system, causes complete
Cease seal record and the bad problem of reproduction effects.
Summary of the invention
The embodiment of the present invention provides a kind of optics module and image recording structure, reduces holographic images to solve speckle effect
Quality, while limiting the resolution ratio of holophotal system, cause hologram record and the bad problem of reproduction effects.
It is as follows that in order to solve the above technical problem, the present invention provides technical solutions:
In a first aspect, the embodiment of the present invention provides a kind of optics module, comprising:
Light source, the light source is for issuing laser；
Beam expander, for being expanded to the laser；
Liquid crystal light modulator, the relevant light modulation positioned at the light emission side of the beam expander, for issuing the beam expander
For partially coherent light.
Further, the liquid crystal light modulator includes being used to form the electrode group of electric field and being located at the electric field to make
With the liquid crystal layer in range, the liquid crystal molecule in the liquid crystal layer can be flipped under electric field action, and then be caused described
Liquid crystal light modulator has different refractive index.
It further, further include the track for being located at the light emission side of the beam expander, the liquid crystal light modulator can be in institute
It states and is moved on track, to adjust the distance between the light-emitting surface of the liquid crystal light modulator Yu the beam expander.
It further, further include collimator, the collimator is located at the light-emitting surface of the liquid crystal light modulator, is used for institute
Partially coherent light collimation is stated to project.
Second aspect, the embodiment of the present invention also provide a kind of image recording structure, including optics module as described above.
It further, further include beam splitting unit, what the beam splitting unit was used to modulate the liquid crystal light modulator
Partially coherent light is divided into reference light and the first object light, wherein the first object light directive subject.
It further, further include imaging len and record plane；
The imaging len is located in the optical path between the subject and the record plane, and the subject is unrestrained
The second object light that reflection issues passes through the imaging len, forms the third object light that plane is recorded described in directive；
The record plane saves the reference light and described for receiving the reference light and the third object light
The interference fringe that three object lights are formed.
It further, further include slit, optical path of the slit between the imaging len and the subject
On.
The third aspect, the embodiment of the present invention also provides a kind of working method of image recording structure as described above, described
Method includes:
Target coherence needed for determining light field；
The liquid crystal light modulator is adjusted to position corresponding with the target coherence, so that described image recording device
The coherence of interior light field is identical as the target coherence, to optimize the hologram image of described image recording device records.
In technical solution provided by the invention, the coherent light tune that will be issued after beam expander expands by liquid crystal light modulator
It is made as partially coherent light, to reduce the coherence in light field, to play the effect for inhibiting the speckle noise as caused by coherent effect
Fruit improves the quality and resolution ratio of the hologram image of image recording structure record.Therefore, technical solution provided by the invention can
Improve the quality and resolution ratio of the hologram image of image recording structure record.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram for the optics module that one embodiment of the invention provides；
Coherent light is modulated to partially coherent by liquid crystal light modulator in the optics module that Fig. 2 provides for one embodiment of the invention
The schematic diagram of light；
Fig. 3 is the flow chart of the working method for the image recording structure that one embodiment of the invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
In the prior art, due to needing inevitably to deposit using coherent source when record is with reproduction hologram
The speckle noise caused by coherent effect.Speckle effect can reduce the quality of holographic images, while limit point of holophotal system
Resolution causes hologram record and the bad problem of reproduction effects.
The embodiment of the present invention in view of the above-mentioned problems, provide a kind of optics module, image recording structure and its working method,
It is able to suppress the speckle noise as caused by coherent effect, improves the quality and resolution of the hologram image of image recording structure record
Rate.
The embodiment of the invention provides a kind of optics modules, as shown in Figure 1, comprising:
Light source 110, the light source 110 is for issuing laser；
Beam expander 120, for being expanded to the laser；
Liquid crystal light modulator 130, the phase positioned at the light emission side of the beam expander 120, for issuing the beam expander 120
Dry light modulation is partially coherent light.
In the embodiment of the present invention, the relevant light modulation that will be issued after beam expander 120 expands by liquid crystal light modulator 130
For partially coherent light, to reduce the coherence in light field, so that the effect for inhibiting the speckle noise as caused by coherent effect is played,
Improve the quality and resolution ratio of the hologram image of image recording structure record.Therefore, technical solution provided by the invention can mention
The quality and resolution ratio of the hologram image of hi-vision recording device records.
Above-mentioned light source 110 is laser light source, and laser light source is a kind of coherent source, can be provided for the record of hologram image
Coherent light.Coherent light refers on the arbitrary point in time or space, especially in a region of the propagation plane perpendicular to light
Interior or in institute's having time of a specified point in space, all parameters of light can predict and relevant light, i.e. coherent light
It is parallel to same propagation axis, superfine, high order focusing light beam is formed, there is between each point fixed phase relationship on coherent light waves
Characteristic.
Coherent light can be used to transmit information, as complete because with the characteristic of fixed phase relationship between each point
Cease the light of image recording.
The laser that above-mentioned beam expander 120 is used to project light source 110 expands, that is, expands the diameter of parallel input light beam
To biggish collimated output beam.Laser is as a kind of coherent light, and the light after expanding does not change the coherence of light, therefore
Light after expanding still is coherent light.Beam expander 120 can use extender lens, and extender lens can change the straight of laser beam
Diameter and the angle of divergence.Laser is carried out by beam expander 120 to expand the utilization rate that can be improved laser.
Above-mentioned liquid crystal light modulator 130 can reduce the coherence of light field by liquid crystal molecule, realize coherent light tune
It is made as partially coherent light.As shown in Fig. 2, liquid crystal modulator 130 may include the unit for being spatially arranged in a column, Mei Gedan
Member can be independently modulated to by the light of its own.
Highly coherent laser beam often will appear laser speckle phenomenon in laser lighting, pass through liquid crystal light modulator
Coherent light is modulated to partially coherent light by 130 can eliminate some ill-effects of coherent light, such as cyclization, speckle, edge effect
It is moved with coke.
As shown in Figure 1, can also include multiple reflecting mirrors in optics module, change the propagation position of optical path by reflecting mirror
It sets and direction, the space layout of each device in Lai Youhua optics module, convenient for the design of the lightening of optics module and micromation.
Further, the liquid crystal light modulator 130 includes being used to form the electrode group of electric field and positioned at the electric field
Liquid crystal layer in sphere of action, the liquid crystal molecule in the liquid crystal layer can be flipped under electric field action, and then lead to institute
Liquid crystal light modulator is stated with different refractive index.
Electrode group may include the first electrode and second electrode being oppositely arranged, and liquid crystal layer can be located at first electrode and the
Between two electrodes.When the electric field change that electrode group is formed, the liquid crystal molecule in liquid crystal layer can turn under corresponding electric field action
Turn, different electric fields enables to liquid crystal layer to have different density gradients, causes the refraction coefficient of liquid crystal layer different.
As shown in Fig. 2, the schematic diagram changed for liquid crystal light modulator to light.It is different to change liquid crystal layer by electrode group
Refractive index can change the optical circuit path of liquid crystal layer emergent light, achieve the effect that the spatial coherence for reducing light beam.
In the present embodiment, user can adjust liquid crystal light modulator and reduce by adjusting the electric field that electrode group is formed to be concerned with
Property degree, and then achieve the effect that adjust light field in coherence degree.
It further, further include the track 140 for being located at the light emission side of the beam expander 120, the liquid crystal light modulator 130
It can be moved on the track 140, to adjust between the liquid crystal light modulator 130 and the light-emitting surface of the beam expander 120
Distance.
Liquid crystal light modulator 130 can slide on track 140, therefore can adjust liquid crystal light modulation by track 140
The distance between the light-emitting surface of device 130 and beam expander 120, wherein liquid crystal light modulator 130 is in the light-emitting surface with beam expander 120
The different corresponding degree that coherent light is modulated to partially coherent light of distance are also different.
Therefore, user can be modulated to the degree demand of partially coherent light according to practical coherent light, to adjust liquid crystal light-modulating
The distance between the light-emitting surface of device 130 and beam expander 120 processed, the liquid crystal light modulator 130 in sliding process remains can
The angle cooperated with beam expander 120, from regardless of which position to stop the relevant light modulation that can project beam expander 120 in
For partially coherent light.
In the present embodiment, track 140 may include duplicate rows dragging track, i.e. two row parallel tracks setting, liquid crystal light modulation
The opposite end of device 130 can slide on two row dragging tracks respectively, to realize that liquid crystal light modulator 130 is whole in duplicate rows
It is slided on dragging track.Certainly, track 140 can also be other forms, such as uniline dragging track, three row dragging tracks etc.
Deng it will be understood that any track that liquid crystal light modulator 130 can be made mobile belongs to protection scope of the present invention.
It should be noted that can not be dropped when the position of liquid crystal light modulator 130 is in the focus of beam expander 120
Coherence in low light field, speckle are not inhibited.Liquid crystal light modulator 130 is turned left from focal position or toward moving right
Afterwards, it can reduce the coherence in light field, can play the role of inhibiting speckle at this time.
In the present embodiment, by add can adjust between liquid crystal light modulator 130 and the light-emitting surface of beam expander 120 away from
From track 140, so as to adjust the degree of coherence in light field.
It further, further include collimator 150, the collimator 150 is located at the light out of the liquid crystal light modulator 130
Face is projected for collimating the partially coherent light.
The partially coherent light collimation that collimator 150 is used to modulate liquid crystal light modulator 130 projects, and liquid crystal light is avoided to modulate
The partially coherent light dispersion that device 130 projects is shot out, and improves the utilization rate to partially coherent light.It can be made by collimator 150
Must record in the light field of hologram is that image recording is carried out by partially coherent light, is reduced in hologram image forming process
Coherence, to improve the quality of hologram image.
Collimator 150 includes but is not limited to that can also be other optics devices by the scheme being made of a lens in Fig. 1
What part was formed, it is not construed as limiting herein.
The embodiment of the present invention also provides a kind of image recording structure, including optics module as described above.
Above-mentioned image recording structure can be video camera, camera etc..
It further, further include beam splitting unit 160, the beam splitting unit 160 is for adjusting the liquid crystal light modulator 130
The partially coherent light being made is divided into reference light and the first object light, wherein the first object light directive subject.
Beam splitting unit 160 is used to partially coherent light being divided into reference light and the first object light.It include standard in image recording structure
In the case where straight device 150, beam splitting unit 160 is used to for the partially coherent light that the collimation of collimator 150 projects being divided into reference light and the
One object light.
Specific mode: beam splitting unit 160 can be half-reflecting half mirror, and half-reflecting half mirror can be by incident light according to certain
The reflected light and transmitted light that ratio point forms an angle can use half-reflecting half mirror by partially coherent light in the present embodiment
It is divided into reference light and the first object light according to the ratio of 1:1, wherein it can be that reference light is reflected light, the first object light is transmitted light,
It is also possible to that reference light is transmitted light, the first object light is reflected light；Beam splitting unit 160 is also possible to by two triangle glass ribs
Mirror is made, they are glued together on matrix using polyester, epoxy resin or polyurethane binding, by adjusting resin layer
Thickness so that being reflected from the half of the light of the first face incidence, the other half continues to transmit due to whole internal reflections, reaches
The effect of beam splitting；Can also be half-silvered mirror, i.e., a piece of glass or plastic side is coated with the metal coating of thin transparent, so that with
45 degree of angles are incident and the part of light that coated does not absorb is transmitted, and rest part is reflected, and achievees the effect that beam splitting.
In the present embodiment, partially coherent light is divided into reference light and the first object light by restriction specifically which kind of mode, is answered
When thinking that any scheme that partially coherent light is divided into reference light and the first object light belongs to the protection scope of the present embodiment.
It further, further include imaging len 170 and record plane 180；
The imaging len 170 is located in the optical path between the subject and the record plane 180, described shot
The second object light that diffusing reflection issues after object is irradiated by the first object light passes through the imaging len 170, is formed and is recorded described in directive
The third object light of plane 180；
The record plane 180 saves the reference light and institute for receiving the reference light and the third object light
The interference fringe for stating the formation of third object light, to record the hologram of subject.
It should be noted that " the directive record plane " in the present embodiment refers to that light can reach record plane, light can be
Record plane is directly reached without other optical elements, is also possible to further reflection, refraction by other optical elements
Etc. eventually arriving at record plane.
Further, further include slit 190, the slit 190 be located at the imaging len 170 and the subject it
Between optical path on.
Slit 190 is that a width is adjustable, slot apertures of narrow elongate, passes through the principle of pinhole imaging system, subject issues
Light the corresponding picture of subject can be formed in record plane with after imaging len 170 by slit 190.
The embodiment of the present invention also provides a kind of working method of image recording structure, as shown in Figure 3, which comprises
Step 301: target coherence needed for determining light field；
Step 302: adjusting the liquid crystal light modulator to position corresponding with the target coherence, so that described image
The coherence of light field in recording device is identical as the target coherence, to optimize the holography of described image recording device records
Image.
In the present embodiment, the coherent light issued after beam expander expands can be modulated to partially coherent by liquid crystal light modulator
Light, to reduce the coherence in light field, and liquid crystal light modulator is in the degree that different location can reduce the coherence of light field
Different, coherence's degree needed for corresponding light field when by predefining hologram image without speckle, so as to adjust liquid crystal light-modulating
Device processed extremely position corresponding with coherence's degree needed for the light field, it is ensured that the hologram image that image recording structure records is not
Speckle phenomena is had, the quality and resolution ratio of the image that image recording structure records are improved.
The light source that image recording structure includes is laser light source, and laser light source is a kind of coherent source, can be hologram
The record of picture provides coherent light.Coherent light refers on the arbitrary point in time or space, especially flat in the propagation perpendicular to light
In one region in face or in institute's having time of a specified point in space, all parameters of light can be predicted and relevant
Light, i.e. coherent light are parallel to same propagation axis, form superfine, high order focusing light beam, have between each point on coherent light waves
The characteristic of fixed phase relationship.
Coherent light can be used to transmit information, as complete because with the characteristic of fixed phase relationship between each point
Cease the light of image recording.
The laser that the beam expander that image recording structure includes is used to project light source expands, that is, expands parallel input light
The diameter of beam is to biggish collimated output beam.For laser as a kind of coherent light, the light after expanding does not change the phase of light
Stemness, therefore the light after expanding still is coherent light.Beam expander 120 can use extender lens, and extender lens can change sharp
The diameter and the angle of divergence of light light beam.Laser is carried out by beam expander 120 to expand the utilization rate that can be improved laser.
The liquid crystal light modulator that image recording structure includes can reduce the coherence of light field by liquid crystal molecule, realize
Coherent light is modulated to partially coherent light.As shown in Fig. 2, liquid crystal modulator may include the list for being spatially arranged in a column
Member, each unit can be independently modulated to by the light of its own.
Highly coherent laser beam often will appear laser speckle phenomenon in laser lighting, will by liquid crystal light modulator
Coherent light, which is modulated to partially coherent light, can eliminate some ill-effects of coherent light, such as cyclization, speckle, edge effect and coke
It moves.
As shown in Figure 1, can also include multiple reflecting mirrors in optics module, change the propagation position of optical path by reflecting mirror
It sets and direction, the space layout of each device in Lai Youhua optics module, convenient for the design of the lightening of optics module and micromation.
In addition, image display device further includes track, liquid crystal light modulator can slide in orbit, therefore pass through track
The distance between the light-emitting surface of liquid crystal light modulator and beam expander can be adjusted, wherein liquid crystal light modulator with beam expander
The different corresponding degree that coherent light is modulated to partially coherent light of light-emitting surface distance are also different.
Therefore, user can be modulated to the degree demand of partially coherent light, i.e. target coherence according to practical coherent light, come
The distance between liquid crystal light modulator and the light-emitting surface of beam expander are adjusted, the liquid crystal light modulator in sliding process remains energy
The angle of enough and beam expander cooperation, from regardless of stopping that the coherent light that beam expander projects portion can be modulated in which position
Divide coherent light.Wherein, the determination of target coherence can be determined according to the illumination of photographed scene, visibility etc. parameter,
The present embodiment is not construed as limiting this.
In the present embodiment, track may include duplicate rows dragging track, i.e. two row parallel tracks setting, liquid crystal light modulator
Opposite end can slide on two row dragging tracks respectively, to realize that liquid crystal light modulator is whole on duplicate rows dragging track
Sliding.Certainly, track can also be other forms, such as uniline dragging track, three row dragging tracks etc., it will be understood that any
The track that liquid crystal light modulator 130 can be made mobile belongs to protection scope of the present invention.
It should be noted that light field can not be reduced when the position of liquid crystal light modulator is in the focus of beam expander
In coherence, speckle is not inhibited.Liquid crystal light modulator is turned left from focal position or toward after moving right, can reduce
Coherence in light field can play the role of inhibiting speckle at this time.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in fields of the present invention
The ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneously
Any sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.
Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafter
And its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physics
Or mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower",
"left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closed
System may also correspondingly change.
It is appreciated that ought such as layer, film, region or substrate etc element be referred to as be located at another element "above" or "below"
When, which " direct " can be located at "above" or "below" another element, or may exist intermediary element.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form belongs within protection of the invention.
Claims (9)
1. a kind of optics module characterized by comprising
Light source, the light source is for issuing laser；
Beam expander, for being expanded to the laser；
Liquid crystal light modulator, positioned at the light emission side of the beam expander, the coherent light for issuing the beam expander is modulated to portion
Divide coherent light.
2. optics module according to claim 1, which is characterized in that the liquid crystal light modulator includes being used to form electric field
Electrode group and the liquid crystal layer within the scope of the electric field action, the liquid crystal molecule in the liquid crystal layer can be in electric field
It is flipped under effect, and then causes the liquid crystal light modulator that there is different refractive index.
3. optics module according to claim 1, which is characterized in that further include the rail of the light emission side positioned at the beam expander
Road, the liquid crystal light modulator can move on the track, to adjust the liquid crystal light modulator and the beam expander
The distance between light-emitting surface.
4. optics module according to claim 1, which is characterized in that further include collimator, the collimator is located at described
The light-emitting surface of liquid crystal light modulator is projected for collimating the partially coherent light.
5. a kind of image recording structure, including such as optics module of any of claims 1-4.
6. image recording structure according to claim 5, which is characterized in that it further include beam splitting unit, the beam splitting unit
Partially coherent light for modulating the liquid crystal light modulator is divided into reference light and the first object light, wherein first object
Light emission is to subject.
7. image recording structure according to claim 6, which is characterized in that further include imaging len and record plane；
The imaging len is located in the optical path between the subject and the record plane, the subject diffusing reflection
The second object light issued passes through the imaging len, forms the third object light that plane is recorded described in directive；
The record plane saves the reference light and the third object for receiving the reference light and the third object light
The interference fringe that light is formed.
8. image recording structure according to claim 7, which is characterized in that further include slit, the slit is located at described
In optical path between imaging len and the subject.
9. a kind of working method of the image recording structure as described in any one of claim 5-8, which is characterized in that the figure
As recording device includes optics module as claimed in claim 3, which comprises
Target coherence needed for determining light field；
The liquid crystal light modulator is adjusted to position corresponding with the target coherence, so that in described image recording device
The coherence of light field is identical as the target coherence, to optimize the hologram image of described image recording device records.
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| CN110187626A (en) * | 2019-05-28 | 2019-08-30 | 京东方科技集团股份有限公司 | Hologram optical device, holographic optical system and holographic display system |
| WO2020238834A1 (en) * | 2019-05-28 | 2020-12-03 | 京东方科技集团股份有限公司 | Holographic optical device, holographic optical system, and holographic display system |
| CN110187626B (en) * | 2019-05-28 | 2021-03-16 | 京东方科技集团股份有限公司 | Holographic optical device, holographic optical system, and holographic display system |
| US11860574B2 (en) | 2019-05-28 | 2024-01-02 | Beijing Boe Display Technology Co., Ltd. | Holographic optical apparatus, holographic optical system, and holographic display system |
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