WO2021066207A1 - Dispositif et procédé de transmission d'hologramme à l'aide d'un matériau holographique pouvant être mis à jour - Google Patents

Dispositif et procédé de transmission d'hologramme à l'aide d'un matériau holographique pouvant être mis à jour Download PDF

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Publication number
WO2021066207A1
WO2021066207A1 PCT/KR2019/012685 KR2019012685W WO2021066207A1 WO 2021066207 A1 WO2021066207 A1 WO 2021066207A1 KR 2019012685 W KR2019012685 W KR 2019012685W WO 2021066207 A1 WO2021066207 A1 WO 2021066207A1
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WIPO (PCT)
Prior art keywords
hologram
uhm
recorded
restored
holographic material
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PCT/KR2019/012685
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English (en)
Korean (ko)
Inventor
홍지수
김영민
강훈종
홍성희
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전자부품연구원
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Publication of WO2021066207A1 publication Critical patent/WO2021066207A1/fr

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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
    • G03H1/0402—Recording geometries or arrangements
    • 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
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0065—Recording, reproducing or erasing by using optical interference patterns, e.g. holograms
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1395—Beam splitters or combiners
    • 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
    • G03H1/0402—Recording geometries or arrangements
    • G03H2001/0413—Recording geometries or arrangements for recording transmission holograms

Definitions

  • the present invention relates to a holographic-related technology, and more particularly, to an apparatus and method capable of transmitting and reproducing a holographic video in real time.
  • analog holography is a method of reproducing after recording a target light wave surface on a holographic material through interference. Such analog holography can record and reproduce high-quality 3D holographic images using the high resolution of the holographic material. However, since the holographic material recorded once cannot be re-recorded, it can be applied only to still images.
  • the process of recording the transmitted digital information in a holographic material is also generally recorded by the holographic printing method as shown in FIG. 2 because the resolution of the current spatial light modulator (SLM) is relatively very low.
  • the loaded image information is optically demagnified to a sufficiently small size and recorded on the holographic material in units called hogels.
  • the method of recording each hogel is the image information from the SLM as an object beam as shown in FIG. 3. It is used to record in the conventional analog holography method.
  • the present invention has been conceived to solve the above problems, and an object of the present invention is to provide an apparatus and method capable of acquiring and transmitting a high-resolution hologram in real time using an updatable holographic material.
  • a hologram transmission apparatus includes: a first UHM (Updatable Holographic Material) in which a hologram is rewritable; A second UHM in which the hologram is rewritable; And an optical system for transferring the hologram restored after being recorded in the first UHM to the second UHM to be recorded.
  • a first UHM Updatable Holographic Material
  • a second UHM in which the hologram is rewritable
  • the hologram transmission apparatus irradiates a reference beam in a first direction to a first UHM when a hologram is recorded in a first UHM, and a reference beam in a second direction to a second UHM when the hologram is restored in the first UHM.
  • a light source for irradiating; may further include.
  • the reference beam irradiated in the second direction may have a conjugate relationship with the reference beam irradiated in the first direction.
  • the optical system may include a first beam splitter that transmits the object beam to the first UHM by transmitting it or reflects the beam restored from the first UHM and transmits it to the second UHM.
  • the first beam splitter may be a polarizing beam splitter (PBS), and a polarization state of a beam irradiated to an object and a reference beam irradiated in the first direction may be matched to a transmission polarization state of PBS.
  • PBS polarizing beam splitter
  • the polarization state of the reference beam irradiated in the second direction may be adjusted to the reflected polarization state of PBS.
  • the optical system may further include a second beam splitter that reflects the beam reflected from the first beam splitter and makes it incident on the second UHM, or transmits the beam restored from the second UHM and makes it incident on the third UHM. .
  • the optical system includes: a first shutter that opens the object side only when a hologram is recorded in the first UHM; It may further include a second shutter that opens the side of the first UHM only when the hologram is recorded in the first UHM or the hologram recorded in the first UHM is restored.
  • the optical system includes: a third shutter provided between the first beam splitter and the second beam splitter that opens only when a hologram recorded in the first UHM is restored; And a fourth shutter that opens the second UHM side only when the hologram is recorded in the second UHM or the hologram recorded in the second UHM is restored.
  • a hologram transmission method includes: recording a hologram in a first UHM (Updatable Holographic Material) rewritable; Restoring the hologram recorded in the first UHM; Transferring the restored hologram to a second UHM in which the hologram is rewritable; Recording the transferred hologram in the second UHM; And restoring the hologram recorded in the second UHM.
  • UHM Updatable Holographic Material
  • a hologram transmission apparatus includes a first UHM (Updatable Holographic Material) in which a hologram is rewritable; And an optical system for transferring a hologram restored after being recorded in the first UHM to a second rewritable UHM for recording.
  • UHM Updatable Holographic Material
  • a hologram transmission method includes: recording a hologram in a first UHM (Updatable Holographic Material) rewritable; Restoring the hologram recorded in the first UHM; And transmitting the restored hologram to a second UHM in which the hologram is rewritable.
  • first UHM Updatable Holographic Material
  • a high-resolution holographic image can be acquired, transmitted and displayed in real time without the burden of processing, transmitting, and displaying a large-capacity digital signal in real time using an Updatable holographic materila. You will be able to.
  • 1 is a diagram showing a process of acquiring and processing real-time 3D video information
  • FIGS. 2 and 3 are diagrams showing a holographic printing method
  • FIG. 6 is a diagram showing reproduction of an analog hologram using a conjugate reference beam
  • FIGS. 7 to 9 are diagrams showing a structure and an operating method for transmitting object light recorded on an updatable holographic materia to another updatable holographic material in real time;
  • FIG. 10 is a diagram showing a basic module for continuously relaying and transmitting holograms recorded on an Updatable holographic materia;
  • 11 to 13 are diagrams showing an operation method of a basic module for continuously relaying and transmitting a hologram recorded in an Updatable holographic material
  • FIG. 14 is a diagram showing time scheduling for recording, reproducing, and erasing of updatable holographic materias
  • 15 is a diagram showing a structure for relaying and transmitting light waves from a target object to an observer distant from a certain distance;
  • 16 is a diagram showing the structure of an illumination optical system of an m-th basic module
  • 17 and 18 are views showing the illumination optical system of FIG. 16 projected in side view and frontal view;
  • 19 to 21 are views showing the projection of the top, middle, and bottom layers of an illumination optical system in a top view.
  • FIG. 4 to 6 show a method of recording and reproducing an analog hologram.
  • the collimated laser beam is divided into two, and one is used as illumination for the target object, and one is a holographic material for recording the hologram. It is incident on as a reference beam.
  • the illumination is scattered from the object and acts as an object beam, causing interference with the reference beam in the holographic material, and this interference pattern is recorded in the holographic material.
  • the hologram When the hologram is reproduced, as shown in FIG. 5, if the reference beam used for hologram recording is irradiated to the holographic material recorded with the hologram, the same wavefront as the object beam is reproduced, and the recorded wavefront is recorded when observing the reconstructed wavefront. You can see the image of the target object.
  • FIG. 7 to 9 show a holographic image recorded in one updatable holographic material (hereinafter U1) using the relationship between recording and reproducing of the analog hologram without conversion to a digital signal in another updatable holographic material (hereinafter referred to as U2). It shows how to transmit the analog wavefront by itself.
  • U1 updatable holographic material
  • U2 updatable holographic material
  • FIG. 7 shows recording the analog hologram of the target object to be recorded in U1.
  • U1 and U2 shutters and a polarizing beam splitter (PBS) are configured as shown in FIG. 7.
  • PBS polarizing beam splitter
  • the shutters between the object and U1 are open, and the shutters between U2 and U1 are closed, so the wavefront diffracted from the object is transmitted to U1 but cannot be transmitted to U2.
  • Recording the hologram in U1 follows the conventional analog hologram recording method, and the polarization states of the illumination beam and the reference beam are set to the transmission polarization state of PBS to maximize the efficiency of transmission of the PBS and recording in U1.
  • FIG. 8 shows the steps for transferring the hologram recorded in U1 to U2.
  • the open and closed states of the shutters are as shown in Fig.8, the collimated laser beam is divided into two and one is irradiated in the direction of the conjugate reference beam at U1, and at U2 is irradiated as a reference beam for recording a new hologram. Will do.
  • the polarization state of the collimated laser beam is set to the reflective polarization state of the PBS in order to obtain the maximum efficiency reflection in the two PBSs between U1 and U2.
  • the hologram recorded in U1 reproduces the wavefront in which the object beam recorded by the conjugate reference beam proceeds in reverse, and this wavefront is transmitted as object light to U2 through reflection by PBS.
  • the object light and the reference beam to U2 interfere with U2 and record the hologram.
  • the wavefront transmitted to U2 as object light is a reverse wavefront of the wavefront transmitted to U1 as object light
  • the wavefront that travels back to U2 becomes the same wavefront as the original object light transmitted to U1. That is, since the object light reproduced by U2 in this step is the same wavefront as the wavefront diffracted from the original target object, it shows that the object light recorded in U1 can be transmitted to U2 and reproduced without conversion to a digital signal.
  • the polarization of the conjugate reference beam is adjusted to the transmission polarization state of the PBS in order to obtain maximum efficiency when transmitting the PBS again.
  • U1 is in a state where external light is blocked by the closed shutters, and it goes through the erasing phase of erasing the hologram recorded in U1 in a method suitable for the characteristics of the material of U1.
  • FIG. 10 shows a basic module for continuously relaying and transmitting holograms recorded on an updatable holographic material.
  • the light wave reproduced from U(n-1), which is the (n-1)th updatable holographic material of the previous module, is shown in FIG. 7
  • the n-th updatable holographic material U(n) and the (n+1)-th updatable holographic material U(n+1) may be sequentially delivered.
  • time scheduling for recording, playback and erasing of each updatable holographic material for each frame to relay the hologram recorded in real time is as shown in Fig. 14, and when the kth frame is transferred to the next updatable holographic material, the hologram is recorded. There is a delay as much as the time it takes.
  • the method shown in FIGS. 7 to 9 and 11 to 13 By relaying the light waves from the target object sequentially, the light waves from the target object can be delivered in real time after a certain delay to an observer away from a certain distance.
  • FIG. 16 shows an illumination optical system structure that is easy to construct a relay structure when irradiating a reference beam and a conjugate reference beam to the module shown in FIG. 10.
  • the illumination optical system structure is positioned above and below the module structure including the updatable holographic material to form a three-layer structure of top, middle, and bottom layers as a whole.
  • the light source from one laser source is divided into two and irradiated as a conjugate reference beam to U(2m+1) and a reference beam to U(2m+2) respectively.
  • fiber The coupling is delivered to the collimating lens and then irradiated onto updatable holographic materials at an inclined angle for off-axis illumination.
  • the light source from one laser source is divided into two, and a collimated laser beam is applied to the half wave plate (HWP) to irradiate it as a conjugate reference beam to U(2m+2) and a reference beam to U(2m+3).
  • HWP half wave plate
  • FIG. 17 is a view showing the illumination optical system of FIG. 16 projected in a side view
  • FIG. 18 is a view showing the illumination optical system projected in a frontal view
  • FIG. 19 is a view showing by projecting the top layer of the illumination optical system to the top view
  • FIG. 20 is a diagram showing the projection of the middle layer of the illumination optical system to the top view
  • FIG. 21 is a top view of the bottom layer of the illumination optical system. It is a diagram projected by.
  • the acquired holographic image is not converted, processed, transmitted, and displayed into a digital signal using an Updatable holographic material, and the acquired wavefront is relayed to the analog wavefront itself without converting it to a digital signal, and the final display is performed.
  • a method for acquiring, transmitting, and displaying high-resolution holographic images in real time without the burden of processing, transmitting, and displaying large-capacity digital signals in real time is proposed.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)

Abstract

L'invention concerne un dispositif et un procédé susceptibles d'obtenir et de transmettre un hologramme à haute résolution en temps réel à l'aide d'un matériau holographique pouvant être mis à jour. Un dispositif de transmission d'un hologramme selon un mode de réalisation de la présente invention comprend : un premier matériau holographique pouvant être mis à jour (UHM) sur laquelle un hologramme peut être mis à jour ; un second UHM sur lequel un hologramme peut être mis à jour ; et un système optique servant à transférer, au second UHM, un hologramme qui est restauré après avoir été enregistré sur le premier UHM, de façon à enregistrer l'hologramme. En conséquence, en utilisant le matériau holographique pouvant être mis à jour, il est possible d'obtenir, de transmettre et d'afficher des images holographiques à haute résolution en temps réel, sans la charge de traitement, de transmission et d'affichage d'un grand signal numérique en temps réel.
PCT/KR2019/012685 2019-09-30 2019-09-30 Dispositif et procédé de transmission d'hologramme à l'aide d'un matériau holographique pouvant être mis à jour WO2021066207A1 (fr)

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KR1020190120306A KR102252949B1 (ko) 2019-09-30 2019-09-30 재기록 가능한 홀로그래픽 매질을 이용한 홀로그램 전송 장치 및 방법
KR10-2019-0120306 2019-09-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006511843A (ja) * 2002-10-22 2006-04-06 ゼブラ・イメージング・インコーポレイテッド アクティブ・デジタル・ホログラム・ディスプレイ
US20090174920A1 (en) * 2008-01-09 2009-07-09 Samsung Electronics Co., Ltd. Apparatus for recording/reproducing holographic data
KR20120112987A (ko) * 2011-04-04 2012-10-12 한국과학기술연구원 디지털 홀로그램 현미경 시스템 및 이를 이용한 3차원 영상 획득 방법
KR20180051187A (ko) * 2016-11-08 2018-05-16 서울대학교산학협력단 홀로그래픽 광학 소자의 제조 장치 및 홀로그램 재생 장치
WO2019039663A1 (fr) * 2017-08-25 2019-02-28 주식회사 내일해 Dispositif et procédé améliorés de reconstruction holographique

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4214601B2 (ja) * 1999-02-24 2009-01-28 ソニー株式会社 ホログラム記録再生装置及びホログラム記録再生方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006511843A (ja) * 2002-10-22 2006-04-06 ゼブラ・イメージング・インコーポレイテッド アクティブ・デジタル・ホログラム・ディスプレイ
US20090174920A1 (en) * 2008-01-09 2009-07-09 Samsung Electronics Co., Ltd. Apparatus for recording/reproducing holographic data
KR20120112987A (ko) * 2011-04-04 2012-10-12 한국과학기술연구원 디지털 홀로그램 현미경 시스템 및 이를 이용한 3차원 영상 획득 방법
KR20180051187A (ko) * 2016-11-08 2018-05-16 서울대학교산학협력단 홀로그래픽 광학 소자의 제조 장치 및 홀로그램 재생 장치
WO2019039663A1 (fr) * 2017-08-25 2019-02-28 주식회사 내일해 Dispositif et procédé améliorés de reconstruction holographique

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KR20210037862A (ko) 2021-04-07

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