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WO2000011521A1 - Procédé et dispositif de formation d'hologrammes - Google Patents

Procédé et dispositif de formation d'hologrammes Download PDF

Info

Publication number
WO2000011521A1
WO2000011521A1 PCT/DE1999/002581 DE9902581W WO0011521A1 WO 2000011521 A1 WO2000011521 A1 WO 2000011521A1 DE 9902581 W DE9902581 W DE 9902581W WO 0011521 A1 WO0011521 A1 WO 0011521A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
sensitive layer
parabolic
parabolic mirror
holograms
Prior art date
Application number
PCT/DE1999/002581
Other languages
German (de)
English (en)
Inventor
Ralf Böttcher
Peter Dittrich
Original Assignee
Boettcher Ralf
Peter Dittrich
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boettcher Ralf, Peter Dittrich filed Critical Boettcher Ralf
Priority to EP99952433A priority Critical patent/EP1110126A1/fr
Priority to AU64650/99A priority patent/AU6465099A/en
Priority to JP2000566722A priority patent/JP2002523804A/ja
Publication of WO2000011521A1 publication Critical patent/WO2000011521A1/fr

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/268—Holographic stereogram
    • 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
    • G03H1/0486—Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H2001/0208—Individual components other than the hologram
    • G03H2001/0216—Optical components
    • 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
    • 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
    • G03H2001/0415—Recording geometries or arrangements for recording reflection holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/26—Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique
    • G03H1/268—Holographic stereogram
    • G03H2001/2695—Dedicated printer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2223/00—Optical components
    • G03H2223/24—Reflector; Mirror

Definitions

  • the invention relates to a method for producing holograms, in which two bundles of light beams, at least the first of which are shaped and modulated, interfere in a light-sensitive layer.
  • the invention relates to a device for performing the method.
  • Holograms are interference patterns that result from the superimposition of a first light beam influenced by an object with an unaffected reference light beam. So that the interference pattern can record information from all object points, all light beams coming from these object points must interfere with the reference light beam at the same time. If one takes into account that a light beam is not a coherent structure, but consists of a large number of wave trains, this condition is exacerbated in that wave trains of all light beams coming from the object must overlap at the interference point, even if the optical path lengths between the individual object points and the interference point of different lengths are. If a wave train coming from an object point only arrives at the interference point if it has already left the wave trains of the other object points, the object point does not enter the hologram.
  • the relationship between the wave trains is referred to as coherence, the degree of the relationship as coherence length.
  • the two-dimensional representations can either be obtained photographically, for example by taking stereoscopic images, or derived from a computer-generated object by using the calculates different angles and outputs them as a matrix. Combinations of both variants are also possible.
  • the holograms composed of the sub-holograms can have a vertical parallax. If this is not the case, the objects can be viewed from the sides, but not from above and below.
  • Known devices for producing holograms include a laser, a beam splitter for splitting the laser light into an object beam and a reference beam, a lens system for shaping the object beam, a screen for displaying an image of the Object with which the object beam can be modulated, and a lens system for shaping the reference beam interfering with the object beam.
  • the lens systems have restricted opening angles, have spherical and chromatic aberrations and influence the length ratio of the light beams of the object beam to one another. If the opening angle of the lens system is restricted, the hologram can also only be viewed from the restricted viewing angle. If the lens system has spherical aberrations, distorted holograms are created.
  • the length ratio of the light rays of the object beam to each other for example, by covering the outer light rays a longer way than the inner light rays, a correspondingly large coherence length must be selected so that in the interest of holographic imaging of all object points, all light rays or their connected wave trains can interfere at the same time.
  • a large coherence length can only be achieved with a high-quality laser.
  • the invention has for its object to provide a generic method and a generic device for producing holograms that deliver better holograms with less effort.
  • this object is achieved by the features of claim 1.
  • the length-preserving molding takes place through At least one pair of parabolic mirrors, the first parabolic mirror expanding the bundle of light rays and the second parabolic mirror focusing the bundle of light rays on the light-sensitive layer, larger opening angles are possible and spherical and chromatic aberrations are eliminated, which, for the reasons mentioned above, leads to an additional improvement in the hologram quality and to a further reduction in price of the procedure.
  • These advantages are particularly effective when the bundle of light beams for producing composite holograms is successively focused on different areas of the light-sensitive layer.
  • the above-mentioned object is achieved by the features of claim 7.
  • the first optics instead of a lens at least one first parabolic mirror with which the first bundle of light beams can be focused on the light-sensitive layer, larger opening angles are possible and both the spherical and the chromatic aberrations are eliminated.
  • the first optical system comprises a second parabolic mirror with which the first bundle of light beams can be generated from a light source located at its focal point, all light beams of this bundle of light beams cover the same optical path length from the light source to the light-sensitive layer, so that the coherence length in can essentially be limited to the thickness of the photosensitive layer.
  • a preferred light source is the output of an optical fiber in which light from a laser, in particular a pulsed diode laser, is guided. If there is a beam deflection element between the two parabolic mirrors, the beam deflection preferably being 90 degrees, the light source can be in a different plane than the light-sensitive layer. Between the light source and the adjacent first or second parabolic mirror, between these or between the first parabolic mirror and the light-sensitive layer, a light modulator is arranged, which is preferably designed as a flat screen with controllable light transmission, for example as a liquid crystal display. In some cases, however, it is sufficient to make the light modulators interchangeable in the form of slides.
  • a light scattering element can be arranged between the first parabolic mirror and the light modulator or between it and the light-sensitive layer in order to ensure the exposure of a sufficiently large area of the light-sensitive layer.
  • the parabolic mirrors are off-axis parabolic mirrors with identical parabolic sections.
  • a second optical system is provided, which can comprise a lens system instead of a parabolic mirror system. If a second optical system is assigned to each side of the light-sensitive layer, the device can easily be set up for the production of both transmission and reflection holograms. If a switchover device is also provided with which the second bundle of light beams can be directed onto one of the two sides of the light-sensitive layer, this is simplified.
  • the device and the light-sensitive layer are displaceable relative to one another, it is in particular possible to expose different areas of the light-sensitive layer successively, each representing sub-holograms. Finally, it is provided to assign an identical device to each of the colors red, green and blue and to move them together relative to the light-sensitive layer.
  • the invention is explained in more detail below using an exemplary embodiment.
  • the associated schematic drawing shows a device according to the invention.
  • a parabolic mirror 4 At the focal point 2 of a parabolic mirror 4 is the output 6 of a light guide 8, in which coherent light of a laser, not shown, in particular a pulse laser diode.
  • Focal beams 10 run between the parabolic mirror 4 and its focal point 2.
  • a plane mirror 14 is arranged in the beam path of its guide beams 12 and is at the same time in the beam path of the guide beams 16 of a parabolic mirror 18.
  • the guide beams 12 and 16 are perpendicular to one another. Their inclination to the plane mirror 14 is 45 degrees in each case.
  • Focal rays 32 run between the parabolic mirror 18 and its focal point 20.
  • a liquid crystal display 34 and a diffuser 36 on the layer side are arranged in the beam path parallel to the guide rays 16 on the parabolic mirror side.
  • the beam path outlined above is passed through the object beam light bundle L with the sections L1 to L4 when the laser light is switched on. Since this must interfere with a reference beam R for the production of holograms, there are collimator lenses 38 and 40 on both sides of the light-sensitive layer, the optical axes 42 and 44 of which pass through the focal point 20 of the parabolic mirror 18 and whose focal points 46 and 48 are in outputs 50 and 52 of light guides 54 and 56.
  • the mode of action is as follows:
  • the output 6 of the light guide 8 acts as a point light source, which emits a light cone L1 of rotationally symmetrical intensity distribution, which follows the focal beams 10 and is reflected by the parabolic mirror 4 as a parallel light beam L2 with an inhomogeneous cross-section intensity distribution, which follows the guide beams 12.
  • the expanded light bundle L2 is now directed by the 90 degree deflecting plane mirror 14 as light bundle L3 along the guide beams 16 onto the parabolic mirror 18, which focuses it as light bundle L4 along the fuel beams 32 onto the light-sensitive layer 22 and thereby removes the inhomogeneous intensity distribution.
  • the required length of the coherent wave trains depends almost only on the thickness of the photosensitive Layer, which is why very cheap lasers can be used. Since only plane and parabolic mirrors are used to form the light bundle L1 to L4, spherical aberrations do not occur, which is particularly important in systems with a short aperture with a large aperture angle, nor are chromatic aberrations to be expected, which means that the focal point for each color is in the same place arises.
  • this area is also hit by the parallel reference light bundle R, a Interference pattern that, as a sub-hologram, represents all light in the spatial directions specified by the light bundle L4, which emanates from the object points relevant for this sub-hologram and passes through the sub-hologram in real or virtual form, or also a memory block of a block-organized holographic memory.
  • the collimator lens 38 directs the reference light bundle R onto the side of the light-sensitive layer 22 irradiated by the object light bundle L4, a transmission sub-hologram is produced.
  • the reference light bundle R originates from the collimator lens 40 arranged on the opposite side of the light-sensitive layer 22, a reflection sub-hologram is produced.
  • the reference light bundle R is switched into two beam paths and switched on depending on the desired hologra mart.
  • a composite hologram arises from the large number of sub-holograms, which still has to be developed and fixed.
  • the photosensitive layer 22 could be moved step by step in a first direction x and the rest of the device step by step in a second direction y perpendicular thereto.
  • To produce colored Holograms would be assigned a device to the colors red, green and blue, and each area would be exposed to each color one after the other. All of the devices could be combined in one print head that is movable with respect to the photosensitive layer 22.
  • the compact arrangement of two parabolic mirrors and a plane mirror enables an optimal focal point, a large opening angle, a variable angle between the coupled-in and emerging light and the same optical path lengths from the light source to the focal point.

Landscapes

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

Abstract

Procédé et dispositif de formation d'hologrammes. Dans ledit dispositif, deux faisceaux de lumière (L, R), dont le premier (L) est façonné et modulé, interfèrent dans une couche photosensible (22). Selon ledit procédé, le rapport de longueur des rayons de lumière entre eux est maintenu lors du façonnage. Pour le façonnage du premier faisceau de lumière (L) au moins, le dispositif comprend un premier instrument optique qui comporte de préférence une paire de miroirs paraboliques (4).
PCT/DE1999/002581 1998-08-20 1999-08-19 Procédé et dispositif de formation d'hologrammes WO2000011521A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99952433A EP1110126A1 (fr) 1998-08-20 1999-08-19 Proc d et dispositif de formation d'hologrammes
AU64650/99A AU6465099A (en) 1998-08-20 1999-08-19 Method and device for generating holograms
JP2000566722A JP2002523804A (ja) 1998-08-20 1999-08-19 ホログラムを作製する方法と装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19837713.4 1998-08-20
DE1998137713 DE19837713C2 (de) 1998-08-20 1998-08-20 Verfahren und Vorrichtung zur Herstellung von Hologrammen

Publications (1)

Publication Number Publication Date
WO2000011521A1 true WO2000011521A1 (fr) 2000-03-02

Family

ID=7878088

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/002581 WO2000011521A1 (fr) 1998-08-20 1999-08-19 Procédé et dispositif de formation d'hologrammes

Country Status (5)

Country Link
EP (1) EP1110126A1 (fr)
JP (1) JP2002523804A (fr)
AU (1) AU6465099A (fr)
DE (1) DE19837713C2 (fr)
WO (1) WO2000011521A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006047780A (ja) * 2004-08-05 2006-02-16 Shimadzu Corp 赤外顕微鏡
JP5982993B2 (ja) * 2012-04-25 2016-08-31 大日本印刷株式会社 ホログラム作製装置およびホログラム作製方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796226A (en) * 1986-11-18 1989-01-03 Commissariat A L'energie Atomique Reading head in integrated optics for reading information recorded on a magnetic support
WO1996002873A1 (fr) * 1994-07-19 1996-02-01 Hologram Technology International, Inc. Support d'enregistrement d'images et procede de realisation
EP0849649A2 (fr) * 1996-12-20 1998-06-24 Denso Corporation Hologramme et sa méthode de fabrication

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09319289A (ja) * 1996-05-30 1997-12-12 Asahi Glass Co Ltd ホログラムの露光方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4796226A (en) * 1986-11-18 1989-01-03 Commissariat A L'energie Atomique Reading head in integrated optics for reading information recorded on a magnetic support
WO1996002873A1 (fr) * 1994-07-19 1996-02-01 Hologram Technology International, Inc. Support d'enregistrement d'images et procede de realisation
EP0849649A2 (fr) * 1996-12-20 1998-06-24 Denso Corporation Hologramme et sa méthode de fabrication

Also Published As

Publication number Publication date
DE19837713C2 (de) 2003-04-10
EP1110126A1 (fr) 2001-06-27
JP2002523804A (ja) 2002-07-30
DE19837713A1 (de) 2000-03-09
AU6465099A (en) 2000-03-14

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