CN111948824A - Holographic optical waveguide device for three-dimensional dynamic display and augmented reality display equipment - Google Patents
Holographic optical waveguide device for three-dimensional dynamic display and augmented reality display equipment Download PDFInfo
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- G02B27/01—Head-up displays
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- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G02B27/0172—Head mounted characterised by optical features
- G02B2027/0174—Head mounted characterised by optical features holographic
Abstract
The present disclosure relates to a holographic optical waveguide device and an augmented reality display apparatus for three-dimensional dynamic display, the holographic optical waveguide device including: the optical-mechanical system comprises a laser illumination system and a micro-display, wherein the micro-display is used for loading a three-dimensional calculation hologram obtained by performing wave-front coding on a three-dimensional scene, modulating light waves irradiated to the micro-display by the laser illumination system according to the three-dimensional calculation hologram, and enabling the modulated light waves carrying wave-front information distribution of the three-dimensional scene to enter a lens system; the lens system is used for filtering the light waves carrying the three-dimensional scene wave front information distribution and then injecting the light waves into the coupling-in multiplexing volume holographic grating; coupling multiplexing volume holographic grating, coupling light wave carrying three-dimensional scene wave front information distribution into waveguide plate; the waveguide plate transmits the light waves carrying three-dimensional scene wave-front information distribution to the coupling-out multiplexing volume holographic grating in a total reflection mode; and the coupling-out multiplexing volume holographic grating couples out the light waves carrying the wave front information distribution of the three-dimensional scene to human eyes.
Description
The present invention claims priority from chinese patent application CN202010418635.9, and the contents of the specification, drawings and claims of this priority document are incorporated in their entirety into the present specification and are included as part of the original description of the present specification. Applicants further claim that applicants have the right to amend the description and claims of this invention based on this priority document.
Technical Field
The present disclosure relates to the field of augmented reality technologies, and in particular, to a holographic optical waveguide device for three-dimensional dynamic display and an augmented reality display apparatus.
Background
Near-eye display is that when an observer watches an external real object, information such as images or data superposed in a real environment can be watched, and the near-eye display provides a real-time field interaction function which is not available in the traditional display equipment and has no barrier with the real environment, so that brand-new visual experience is brought to users, and the near-eye display is widely applied to various fields. The holographic waveguide combines the total reflection characteristic of the waveguide with the diffraction characteristic of the holographic grating, can realize large-view-field and large-exit-pupil image output, and is applied to a new generation helmet display system.
The computer holography is to generate the needed object model by computer graphics, sample the wave front, input the obtained object light wave field expression of discrete distribution into the computer and form digital hologram by a certain coding mode. And then loading the calculation hologram on a liquid crystal screen such as an SLM (Selective laser melting), and when a beam of reference light irradiates, a clear reappearance image of the object model can be reappeared on a display screen at a certain distance. However, the current computer holography is mainly used for displaying through a liquid crystal screen directly and is not applied to the technical field of augmented reality.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a holographic optical waveguide device for three-dimensional dynamic display and an augmented reality display apparatus, which are used to implement a real-time dynamic display process for any three-dimensional object model.
According to a first aspect of embodiments of the present disclosure, there is provided a holographic optical waveguide device for three-dimensional dynamic display, comprising: the optical-mechanical system, the lens system, the coupling-in multiplexing volume holographic grating, the waveguide plate and the coupling-out multiplexing volume holographic grating;
the optical-mechanical system comprises a laser illumination system and a micro-display, wherein the micro-display is used for loading a three-dimensional calculation hologram obtained by performing wave-front coding on a three-dimensional scene, the light wave irradiated to the micro-display by the laser illumination system is modulated according to the three-dimensional calculation hologram, and the modulated light wave carrying three-dimensional scene wave-front information distribution enters the lens system;
the lens system is used for filtering the light wave which is modulated by the three-dimensional calculation hologram loaded by the micro display and carries three-dimensional scene wave front information distribution and then injecting the light wave into the coupling-in multiplexing volume holographic grating;
the coupling multiplexing volume holographic grating is used for coupling light waves carrying three-dimensional scene wave front information distribution into the waveguide plate;
the waveguide plate is used for transmitting the light waves carrying three-dimensional scene wave-front information distribution to the coupled-out multiplex volume holographic grating in a total reflection mode;
and the coupling-out multiplexing volume holographic grating is used for coupling out the light waves carrying the three-dimensional scene wave-front information distribution to human eyes.
In one embodiment, the microdisplay comprises a reflective silicon-based liquid crystal display.
In one embodiment, preferably the periods of the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating are the same and mirror symmetric.
In one embodiment, preferably, the laser illumination system includes: the device comprises a laser, an attenuation plate, a half-wave plate, an optical fiber coupler, a single-mode polarization maintaining optical fiber, an optical fiber collimator, an electric control rotating platform, a focusing lens and a polarization splitting prism;
the laser is used for emitting polarized light;
the attenuation plate and the half-wave plate are sequentially arranged along the propagation direction of the polarized light and are used for processing the polarized light emitted by the laser into linearly polarized light and adjusting the input energy of the laser;
the optical fiber coupler is used for coupling the linearly polarized light into the single-mode polarization-maintaining optical fiber;
the single-mode polarization maintaining optical fiber is fixed on the electric control rotary table through an optical fiber collimator, and the light wave emergent end is positioned on the central extension line of a rotary disc of the electric control rotary table, and the plane where the light wave emergent end is positioned is the focal plane of the focusing lens, so that the angle of emergent light waves is adjusted by adjusting the rotating angle of the electric control rotary table;
when the emergent end of the optical fiber slightly moves in the focal plane of the focusing lens along the diameter of the rotating disc of the electric control rotating table in the vertical or horizontal direction, the polar angle of the coupled linearly polarized light
The rotation angle of the optical fiber can be read through the marked scales on the rotating disc, and the azimuth angle theta of the coupled linearly polarized light is obtained by dividing the distance of the optical fiber emergent end which slightly moves along the diameter of the rotating disc in the vertical or horizontal direction by the focal length of the focusing lens and then taking the arc tangent;
the polarization beam splitter prism is used for reflecting the emergent inclined plane light waves into the micro display and emitting the emergent light waves which are modulated by the three-dimensional calculation hologram loaded by the micro display and carry three-dimensional scene wave front information distribution into the lens system.
In one embodiment, preferably, the polar angle of the linearly polarized light coupled into the single-mode polarization-maintaining fiber is adjusted by adjusting the rotation angle of the rotating disk, and the azimuth angle of the linearly polarized light is adjusted by adjusting the distance of the fiber exit end slightly moving in the vertical or horizontal direction along the diameter of the rotating disk;
the micro display loads the three-dimensional calculation hologram according to a preset time interval, determines the angle of the light wave which is emitted into the micro display according to the three-dimensional calculation hologram, and adjusts the rotation angle of the electric control rotary table and the time length of the rotation angle according to the angle through a servo control system of the electric control rotary table, so that the light wave emitted by the micro display carries three-dimensional scene wave front information distribution, and dynamic display can be realized.
In one embodiment, preferably, the lens system includes: a first lens, a diaphragm and a second lens;
the first lens is used for imaging the light wave which is transmitted by the micro display and carries three-dimensional scene wave front information distribution on a first plane;
the diaphragm is arranged on the back focal plane of the first lens, deviates from the imaging center and is used for filtering out zero-order light spots except first-order diffracted light waves and light waves of other diffraction orders;
and the second lens is used for converging the filtered light waves and then enabling the converged light waves to enter the coupling-in multiplexing volume holographic grating.
In one embodiment, preferably, the distance between the second lens and the first plane satisfies the following condition:
f2＜z1＜2f2
wherein z is1Representing the distance of said second lens from said first plane, f2Representing the focal length of the second lens.
In one embodiment, preferably, the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating comprise angle multiplexed volume holographic gratings.
In one embodiment, preferably, the angle-multiplexed volume hologram grating keeps the positions of the object light and the reference light fixed when recording the interference fringes, obtains different angle channels by rotating the recording material, and multiplexes the recording interference fringes at each angle channel, wherein the initial position of the recording material is such that the optical axis of the volume hologram grating is located on the bisector of the angle of the object light and the reference light.
In one embodiment, preferably, the rotation angle of the recording material satisfies the following condition:
wherein, theta0Representing the rotation angle of the recording material, n representing the total number of gratings to be multiplexed recorded, delta thetaminRepresenting a minimum multiplexing angular separation;
the minimum multiplexing angular spacing satisfies the following condition:
Δθminrepresenting the minimum multiplexing angular separation, Δ θbAnd the angle of Bragg is expressed, L is the thickness of the recording material, lambda is the wavelength of the recording light wave, and theta is the included angle between the object light and the reference light and the optical axis during recording.
According to a second aspect of the embodiments of the present disclosure, there is provided an augmented reality display device, including the three-dimensional dynamically-displayed holographic optical waveguide device according to any one of the above technical solutions.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
in the embodiment of the invention, the characteristics of effectively shortening the longitudinal length and expanding the exit pupil by utilizing the holographic waveguide are combined with the advantages of simple LCOS (liquid crystal on silicon) computing holographic device of the reflective silicon-based liquid crystal display and random control of the light wave field, so that the real-time dynamic display process of any three-dimensional object model is realized.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a schematic diagram illustrating the structure of a three-dimensional dynamically displayed holographic optical waveguide device, according to an exemplary embodiment.
Fig. 2 is a schematic structural diagram of a light mechanism system and a lens system in a three-dimensional dynamic display holographic optical waveguide device according to an exemplary embodiment.
FIG. 3 is a schematic diagram illustrating the imaging principle of a lens system in a three-dimensional dynamically displayed holographic optical waveguide device according to an exemplary embodiment.
Fig. 4 and 5 are schematic diagrams illustrating a method for preparing a volume holographic grating based on an angle multiplexing technique according to an exemplary embodiment.
FIG. 6 is a schematic illustration of a dynamic display of a volume holographic grating, according to an example embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Fig. 1 is a schematic structural diagram illustrating a three-dimensional dynamically displayed holographic optical waveguide device according to an exemplary embodiment, and as shown in fig. 1, the holographic optical waveguide device includes: an optical-mechanical system 11, a lens system 12, a coupling-in multiplexing volume holographic grating 13, a waveguide plate 14 and a coupling-out multiplexing volume holographic grating 15;
the optical-mechanical system 11 includes a laser illumination system 111 and a microdisplay 112, where the microdisplay 112 is used to load a three-dimensional computed hologram obtained by performing wavefront coding on a three-dimensional scene, and according to the three-dimensional computed hologram, an optical wave irradiated to the microdisplay 112 by the laser illumination system 111 is modulated, and an object optical wave carrying three-dimensional scene wavefront information distribution after modulation enters the lens system 12;
the lens system 12 is configured to filter the light wave modulated by the three-dimensional computer generated hologram loaded by the microdisplay 112 and carrying three-dimensional scene wavefront information distribution, and then inject the light wave into the coupling-in multiplexing volume holographic grating 13;
the coupling-in multiplexing volume holographic grating 13 is used for coupling light waves carrying three-dimensional scene wave front information distribution into the waveguide plate 14;
the waveguide plate 14 is configured to transmit the light waves carrying the three-dimensional scene wavefront information distribution to the coupling-out multiplexing volume holographic grating 15 in a total reflection manner;
the coupling-out multiplexing volume holographic grating 15 is used for coupling out the light waves carrying the three-dimensional scene wavefront information distribution to human eyes.
In one embodiment, the microdisplay 112 comprises a reflective silicon-based liquid crystal display LCOS.
In one embodiment, preferably the periods of the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating are the same and mirror symmetric.
In the embodiment, the characteristics of effectively shortening the longitudinal length and expanding the exit pupil by utilizing the holographic waveguide are combined with the advantages that a reflective silicon-based liquid crystal display LCOS (liquid crystal on silicon) computing holographic device is simple and a light wave field can be controlled at will, so that the real-time dynamic display process of any three-dimensional object model is realized.
As shown in fig. 2, in one embodiment, the laser illumination system 111 preferably includes: the device comprises a laser 21, an attenuator 22, a half-wave plate 23, a fiber coupler 24, a single-mode polarization-maintaining fiber 25, a fiber collimator 26, an electric control rotary table 27, a focusing lens 28 and a polarization splitting prism 29;
the laser 21 is used for emitting polarized light;
the attenuation plate 22 and the half-wave plate 23 are sequentially arranged along the propagation direction of the polarized light and are used for processing the polarized light emitted by the laser 21 into linearly polarized light and adjusting the input energy of the laser;
the optical fiber coupler 24 is used for coupling the linearly polarized light into the single-mode polarization-maintaining optical fiber 25;
the single-mode polarization maintaining fiber 25 is fixed on the electric control rotary table 27 through a fiber collimator 26, and the fiber exit end is located on the central extension line of the rotary disc of the electric control rotary table 27, and the plane where the fiber exit end is located is the focal plane of the focusing lens 28;
the polarization beam splitter prism 29 is configured to reflect the emitted oblique planar light waves into the microdisplay 112, and emit the emitted light waves modulated by the three-dimensional computer generated hologram loaded on the microdisplay 112 and carrying three-dimensional scene wavefront information distribution into the lens system 12.
In this embodiment, the polarized light from the laser (laser) first passes through a circular adjustable attenuator and a half-wave plate HWP to form linearly polarized light, which is coupled into a single-mode polarization-maintaining fiber (OF) by a fiber coupler (LFC), and the other end OF the single-mode polarization-maintaining fiber is fixed on an electrically controlled rotary table (RS) by a Fiber Collimator (FC). The emergent end of the optical fiber is adjusted to the central extension line of a disc (D) on the electric control rotating table, and the plane where the emergent end of the optical fiber is located is just the focal plane of the Focusing Lens (FL). When the emergent end of the optical fiber moves slightly in the vertical/horizontal direction along the diameter of the disc in the plane, the incident illumination light is the inclined plane light wave. Polar angle of incident illumination light
The rotation angle of the optical fiber can be read through the marked scale on the disk of the rotating device, and the azimuth angle gamma of the incident illumination light can be obtained by taking the arc tangent after the distance of the optical fiber emergent end slightly moving along the diameter of the disk in the vertical/horizontal direction is divided by the focal length of the lens. Inclined plane light wave irradiates to polarization beam splitting edgeAnd on a mirror (PBS), wherein the P wave part of the laser transmits through the polarization plane, the S wave part of the laser is reflected to the LCOS panel by the polarization plane, and the LCOS modulates the incident light wave according to the loaded calculation hologram so as to enable the incident light wave to have three-dimensional scene wave front information distribution.
Specifically, the polar angle of the linearly polarized light coupled into the single-mode polarization maintaining fiber is adjusted by adjusting the rotation angle of the rotating disc, and the azimuth angle of the linearly polarized light is adjusted by adjusting the distance of the fiber emergent end which slightly moves along the diameter of the rotating disc in the vertical or horizontal direction.
In one embodiment, preferably, the lens system 12 includes: a first lens 31, a diaphragm 32, and a second lens 33;
the first lens 31 is configured to image a light wave which is emitted by the microdisplay and carries three-dimensional scene wavefront information distribution on a first plane;
the diaphragm 32 is arranged at the back focal plane of the first lens 31, and the diaphragm 32 is offset from the imaging center and used for filtering out light waves of other diffraction orders except the first-order diffracted light waves;
and the second lens 33 is configured to converge the filtered light wave and then enter the incoupling multiplexing volume holographic grating 13.
In this embodiment, as shown in fig. 3, the reflected light wave modulated by LCOS passes through the polarization plane, and is imaged on the first plane (plane1) through the first Lens (Lens1), a stop is disposed at the back focal plane of the first Lens (Lens1), the stop shifts the imaging center, only the positive-order diffracted light wave passes through the stop, the zero-order bright spot and the reconstructed image of other diffraction orders are filtered out, and then the light is converged by the second Lens (Lens2), and then the light is incident on the multiplexed volume holographic grating manufactured based on the angle multiplexing technology. The object light loaded with three-dimensional scene wave front information distribution after being diffracted by the incident end multiplexing volume holographic grating is coupled into the flat optical waveguide, when the total reflection condition is met, the coupled light can be forwards transmitted to a volume holographic grating area of the coupling-out end in a total reflection mode in the optical waveguide, and enters human eyes for imaging after being diffracted and output by the volume holographic grating of the coupling-out end. The multiplex volume holographic grating at the coupling-out end is also a multiplex volume holographic grating manufactured based on the angle multiplexing technology, has the same period as the multiplex volume holographic grating at the coupling-in end, and is in mirror symmetry.
The second Lens (Lens2) in fig. 3 is introduced to adjust the imaging position and size of the reproduced image. According to the geometric imaging formula of the lens:
wherein f is2Is the focal length, z, of the second Lens (Lens2)1Is an object distance, z2Is the image distance. Then z after a distance of the second Lens (Lens2)2A clear reproduced image can be observed at plane 3(plane 3). By changing the position of the second Lens (Lens2), a sharp reproduced image of different magnification can be obtained at different imaging positions. To obtain an enlarged real image, f is set2＜z1＜2f2Then the magnification is z relative to the reproduced image at the first plane (plane1)2/z1The size of the holographic reproduction image can be conveniently adjusted.
In an embodiment, preferably, the microdisplay loads the three-dimensional computation hologram at a preset time interval, and determines an angle of a light wave entering the microdisplay according to the three-dimensional computation hologram, so as to adjust a rotation angle of the electrically controlled rotary table and a time length of the rotation angle according to the angle by a servo control system of the electrically controlled rotary table, so that the light wave emitted by the microdisplay carries three-dimensional scene wavefront information distribution, and dynamic display can be realized.
In the embodiment, when the disk (D) is rotated, the generated illumination light with different inclination angles is irradiated to the LCOS, the LCOS is controlled to load each frame to calculate the time interval of the hologram, and then the human eyes can obtain different three-dimensional scene wave front reconstruction results at different angle channels. If the rotation angle of the rotary table is accurately controlled by a servo control system of the electric control rotary table during wave front reconstruction and the temporary stay is carried out at each rotation angle position, a dynamic wave front reconstruction holographic display effect can be obtained due to the persistence effect of human eyes.
In one embodiment, preferably, the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating comprise angle multiplexed volume holographic gratings.
In one embodiment, preferably, as shown in fig. 4, the angle-multiplexed volume hologram grating keeps the positions of the object light and the reference light fixed when recording the interference fringes, as shown in fig. 5, different angle channels are obtained by rotating the recording material, and the interference fringes are multiplexed and recorded at each angle channel, wherein the initial position of the recording material is such that the optical axis of the volume hologram grating is located on the bisector of the angle of the object light and the reference light.
In one embodiment, preferably, the rotation angle of the recording material satisfies the following condition:
wherein, theta0Representing the rotation angle of the recording material, n representing the total number of gratings to be multiplexed recorded, delta thetaminRepresenting a minimum multiplexing angular separation;
the minimum multiplexing angular spacing satisfies the following condition:
Δθminrepresenting the minimum multiplexing angular separation, Δ θbAnd the included angle between the object light and the reference light and the optical axis during recording is represented by a Bragg angle, L is the thickness of the recording material, lambda is the wavelength of the recording light, and theta is the included angle between the object light and the reference light and the optical axis during recording.
Then, after the first volume holographic grating is recorded at the initial angle, the recording material is rotated to the initial direction by delta theta _ min to a second angle channel, so that the second volume holographic grating can be recorded in a superposed manner at the same area of the volume holographic material, and the repeated operation can realize the multiplexing recording of the n individual holographic gratings in the same area. After the recording is completed, when object light waves with different angles and loaded with three-dimensional scene wavefront information distribution irradiate the multiplexing volume holographic grating, different three-dimensional scene wavefront reconstruction results can be obtained at different angle channels, as shown in fig. 6. The time interval of the hologram and the rotation angle of the electric control rotating platform are accurately controlled by each frame loaded by the LCOS, and the transient dwell is carried out at each rotation angle position, so that the dynamic wave-front reconstruction holographic display effect can be obtained due to the persistence effect of human eyes.
According to a second aspect of the embodiments of the present disclosure, there is provided an augmented reality display device, including the three-dimensional dynamically-displayed holographic optical waveguide device according to any one of the above technical solutions.
It is further understood that the use of "a plurality" in this disclosure means two or more, as other terms are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.
It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A holographic optical waveguide device for three-dimensional dynamic display, comprising: the optical-mechanical system, the lens system, the coupling-in multiplexing volume holographic grating, the waveguide plate and the coupling-out multiplexing volume holographic grating;
the optical-mechanical system comprises a laser illumination system and a micro-display, wherein the micro-display is used for loading a three-dimensional calculation hologram obtained by performing wave-front coding on a three-dimensional scene, the light wave irradiated to the micro-display by the laser illumination system is modulated according to the three-dimensional calculation hologram, and the modulated light wave carrying three-dimensional scene wave-front information distribution enters the lens system;
the lens system is used for filtering the light wave which is modulated by the three-dimensional calculation hologram loaded by the micro display and carries three-dimensional scene wave front information distribution and then injecting the light wave into the coupling-in multiplexing volume holographic grating;
the coupling multiplexing volume holographic grating is used for coupling the light waves carrying the three-dimensional scene wave-front information distribution into the waveguide plate;
the waveguide plate is used for transmitting the light waves carrying three-dimensional scene wave-front information distribution to the coupled-out multiplex volume holographic grating in a total reflection mode;
and the coupling-out multiplexing volume holographic grating is used for coupling out the light waves carrying the three-dimensional scene wave-front information distribution to human eyes.
2. The holographic optical waveguide system of claim 1, in which the periods of the in-coupling multiplexed volume holographic grating and the out-coupling multiplexed volume holographic grating are the same and mirror symmetric.
3. The holographic optical waveguide system of claim 1, wherein the laser illumination system comprises: the device comprises a laser, an attenuation plate, a half-wave plate, an optical fiber coupler, a single-mode polarization maintaining optical fiber, an optical fiber collimator, an electric control rotating platform, a focusing lens and a polarization splitting prism;
the laser is used for emitting polarized light;
the attenuation plate and the half-wave plate are sequentially arranged along the propagation direction of the polarized light and are used for processing the polarized light emitted by the laser into linearly polarized light and adjusting the input energy of the laser;
the optical fiber coupler is used for coupling the linearly polarized light into the single-mode polarization-maintaining optical fiber;
the single-mode polarization maintaining optical fiber is fixed on the electric control rotary table through an optical fiber collimator, the emergent end of the optical fiber is positioned on the central extension line of a rotary disc of the electric control rotary table, and the plane where the emergent end of the optical fiber is positioned is the focal plane of the focusing lens;
the polarization beam splitter prism is used for reflecting the emergent inclined plane light waves into the micro display and emitting the emergent light waves which are modulated by the three-dimensional calculation hologram loaded by the micro display and carry three-dimensional scene wave front information distribution into the lens system.
4. The holographic optical waveguide system of claim 3, wherein a polar angle of linearly polarized light coupled into the single mode polarization maintaining fiber is adjusted by adjusting a rotation angle of the rotating disk, and an azimuth angle of the linearly polarized light is adjusted by adjusting a distance by which an optical fiber exit end slightly moves in a vertical or horizontal direction along a diameter of the rotating disk;
the micro display loads the three-dimensional calculation hologram according to a preset time interval, determines the angle of the light wave which is emitted into the micro display according to the three-dimensional calculation hologram, and adjusts the rotation angle of the electric control rotating platform and the time length of the rotation angle according to the angle through a servo control system of the electric control rotating platform, so that the light wave emitted by the micro display carries three-dimensional scene wave front information distribution, and dynamic display can be realized.
5. The holographic optical waveguide system of claim 1, wherein the lens system comprises: a first lens, a diaphragm and a second lens;
the first lens is used for imaging the light wave which is transmitted by the micro display and carries three-dimensional scene wave front information distribution on a first plane;
the diaphragm is arranged on the back focal plane of the first lens, deviates from the imaging center and is used for filtering out zero-order light spots except first-order diffracted light waves and light waves of other diffraction orders;
and the second lens is used for converging the filtered light waves and then enabling the converged light waves to enter the coupling-in multiplexing volume holographic grating.
6. The holographic optical waveguide system of claim 1, wherein the distance of the second lens from the first plane satisfies the following condition:
f2＜z1＜2f2
wherein z is1Representing the distance of said second lens from said first plane, f2Representing the focal length of the second lens.
7. The holographic optical waveguide system of claim 1, in which the in-coupling and out-coupling multiplexed volume holographic gratings comprise angle multiplexed volume holographic gratings.
8. The holographic optical waveguide system according to claim 7, wherein the angle-multiplexed volume holographic grating keeps positions of the object light and the reference light fixed when recording the interference fringes, obtains different angle channels by rotating the recording material, and multiplexes the recording interference fringes at each angle channel, wherein the initial position of the recording material is such that an optical axis of the volume holographic grating is located on a bisector of an angle of the object light and the reference light.
9. The holographic optical waveguide system of claim 8, wherein a rotation angle of the recording material satisfies the following condition:
wherein, theta0Representing the rotation angle of the recording material, n representing the total number of gratings to be multiplexed recorded, delta thetaminRepresenting a minimum multiplexing angular separation;
the minimum multiplexing angular spacing satisfies the following condition:
Δθminrepresenting the minimum multiplexing angular separation, Δ θbAnd the angle of Bragg is expressed, L is the thickness of the recording material, lambda is the wavelength of the recording light wave, and theta is the included angle between the object light and the reference light and the optical axis during recording.
10. An augmented reality display device, comprising:
a three-dimensional dynamically displayed holographic optical waveguide device according to any of claims 1 to 9.
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Cited By (4)
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| CN112462522A (en) * | 2020-12-08 | 2021-03-09 | 谷东科技有限公司 | Large-view-field compact near-to-eye display device |
| CN112505925A (en) * | 2020-12-08 | 2021-03-16 | 谷东科技有限公司 | Compact augmented reality near-to-eye device |
| CN112711141A (en) * | 2020-05-18 | 2021-04-27 | 谷东科技有限公司 | Holographic optical waveguide device for three-dimensional dynamic display and augmented reality display equipment |
| CN112945083A (en) * | 2021-01-29 | 2021-06-11 | 中国科学院长春光学精密机械与物理研究所 | Parallel phase shift digital holographic microscopic imaging system with optical fiber interconnection |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112485906B (en) * | 2020-12-08 | 2022-08-02 | 谷东科技有限公司 | Augmented reality near-to-eye device of three-dimensional dynamic full-color display |
| CN112462521A (en) * | 2020-12-08 | 2021-03-09 | 谷东科技有限公司 | Real-time dynamic three-dimensional display augmented reality near-to-eye display device |
| CN112782858A (en) * | 2021-01-21 | 2021-05-11 | 谷东科技有限公司 | Three-dimensional dynamic full-color display augmented reality holographic near-to-eye display device |
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Also Published As
| Publication number | Publication date |
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| CN111948824B (en) | 2022-04-26 |
| CN112711141B (en) | 2021-10-15 |
| CN111474724A (en) | 2020-07-31 |
| CN112711141A (en) | 2021-04-27 |
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