Denisyuk hologram recording method using cone mirror

Abstract

A Denisyuk hologram recording system using a cone mirror, according to an embodiment of the present invention, comprises: a light source unit from which a beam is emitted; and an illumination optical system capable of allowing, when the beam emitted from the light source unit is incident, a reference beam to be incident on the upper surface, the lower surface, the left surface, and the right surface of an object on the basis of the incident beam. Accordingly, by adding the illumination optical system capable of allowing a reference beam to be incident on all of the upper, lower, left, and right surfaces of the object, a Denisyuk hologram may be recorded that enables an observer to view all surfaces of the object even when the observer changes the observation position.

Description

Denishk Hologram Recording Method Using Cone Mirror

[0001] The present invention relates to a hologram recording method, and more specifically, to a Denisyuk-type hologram (reflective hologram) recording method.

[0002] There are reflective and transmissive methods for recording analog holograms of physical objects, and a representative reflective recording method is the Denisyuk type hologram (reflective hologram) recording method.

[0003] Holograms recorded using the conventional Denisyuk-type (reflective hologram) recording method have a problem in that, upon observation, only the surface illuminated by the initial reference beam can be observed, causing areas not illuminated by the reference beam to appear black.

[0004] The present invention has been devised to solve the above-mentioned problems, and the objective of the present invention is to provide a method and apparatus for recording a Denishk hologram that allows an observer to see all sides of an object even if they change their observation position by adding an illumination optical system capable of irradiating a reference beam onto all sides of the object, up, down, left, and right.

[0005] A Denishk hologram recording system using a cone mirror according to one embodiment of the present invention for achieving the above objective comprises: a light source unit from which a beam is emitted; and an illumination optical system capable of irradiating reference beams to the upper surface, lower surface, left surface, and right surface of an object based on the incident beam when the beam emitted from the light source unit is incident.

[0006] And the illumination optical system may include: a beam splitter that splits the incident beam into a first path and a second path when a beam emitted from a light source is incident; a first mirror that adjusts the path of the incident beam when the beam split into the first path is incident; a first spatial filter that diffuses the incident beam when the beam whose path is adjusted by the first mirror is incident; and a holographic emulsion that transmits the incident beam to an object when the beam diffused by the first spatial filter is incident.

[0007] In addition, a beam transmitted through the holographic film illuminates an object and is scattered by the surface of the object, and the scattered beam is re-incident upon the holographic film. The Denischuk holographic recording system can record an interference pattern on the holographic film as the beam incident on the holographic film and the beam scattered by the surface of the object and re-incident upon the object interfere with each other.

[0008] And the illumination optical system may further include: a second mirror that adjusts the path of the incident beam when a beam split into a second path is incident; a second spatial filter that diffuses the incident beam when a beam whose path is adjusted by the second mirror is incident; a collimating lens that collimates the incident beam into a plane wave when a beam diffused by the second spatial filter is incident; a cone mirror that diffuses the incident beam (plane wave) 360 degrees when a beam collimated into a plane wave by the collimating lens is incident; and a concave donut mirror that illuminates the top, bottom, left, and right surfaces of an object with a beam diffused 360 degrees.

[0009] Additionally, the illumination optical system may further include: a second mirror that adjusts the path of the incident beam when a beam divided into a second path is incident; a second spatial filter that diffuses the incident beam when a beam whose path is adjusted by the second mirror is incident; a cone mirror that diffuses the incident beam 360 degrees when a beam diffused by the second spatial filter is incident; and a flat donut mirror that illuminates the top, bottom, left, and right surfaces of an object when a beam diffused 360 degrees is incident.

[0010] And the beam diffused by the second spatial filter can be diffused 360 degrees by the cone mirror and transmitted as a ball wave until it is incident on the flat donut mirror.

[0011] Meanwhile, a Denishk hologram recording method using a cone mirror according to another embodiment of the present invention comprises: a step in which a beam emitted from a light source unit is incident on a beam splitter, and the incident beam is split into a first path and a second path by the beam splitter; a step in which the beam split into the first path is incident on a first mirror, and the path of the incident beam is adjusted by the first mirror, and the path of the incident beam is adjusted by the second mirror, and the path of the incident beam is adjusted by the second mirror, and the beam split into the second path is incident on a second mirror; a step in which the beam whose path is adjusted by the first mirror is incident on a first spatial filter, and the incident beam is diffused by the first spatial filter, and the beam whose path is adjusted by the second mirror is incident on a second spatial filter, and the incident beam is diffused by the second spatial filter. The method comprises: a step in which a beam diffused by a second spatial filter is incident on a collimating lens, and the beam incident on the collimating lens is collimated into a plane wave; a step in which the beam collimated into a plane wave is incident on a cone mirror, and the beam (plane wave) incident on the cone mirror is diffused 360 degrees; a step in which the beam diffused 360 degrees is illuminated on the top, bottom, left, and right surfaces of an object by a concave donut mirror; a step in which the beam diffused by a first spatial filter is incident on a holographic film (Holographic emulsion), and the incident beam is transmitted through the holographic film; a step in which the beam transmitted through the holographic film and the beam diffused 360 degrees are illuminated on an object and scattered by the surface of the object; and a step in which the scattered beam is re-incident on the holographic film, and an interference pattern is recorded on the holographic film as the beam incident on the holographic film and the re-incident beam interfere with each other.

[0012] In addition, a Denishk hologram recording method using a cone mirror according to another embodiment of the present invention comprises: a step in which a beam emitted from a light source unit is incident on a beam splitter, and the incident beam is split into a first path and a second path by the beam splitter; a step in which the beam split into the first path is incident on a first mirror, and the path of the incident beam is adjusted by the first mirror, and the path of the incident beam is adjusted by the second mirror, and the path of the incident beam is adjusted by the second mirror, and the beam split into the second path is incident on a second mirror; a step in which the beam whose path is adjusted by the first mirror is incident on a first spatial filter, and the incident beam is diffused by the first spatial filter, and the beam whose path is adjusted by the second mirror is incident on a second spatial filter, and the incident beam is diffused by the second spatial filter. The method comprises: a step in which a beam diffused by a second spatial filter is incident on a cone mirror, and the beam incident by the cone mirror is diffused 360 degrees; a step in which a beam diffused 360 degrees by a flat donut mirror is illuminated on the top, bottom, left, and right surfaces of an object; a step in which a beam diffused by a first spatial filter is incident on a holographic emulsion, and the incident beam is transmitted through the holographic emulsion; a step in which the beam transmitted through the holographic emulsion and the beam diffused 360 degrees are illuminated on an object and scattered by the surface of the object; and a step in which the scattered beam is re-incident on the holographic emulsion, and an interference pattern is recorded on the holographic emulsion as the beam incident on the holographic emulsion and the re-incident beam interfere with each other.

[0013] As described above, according to embodiments of the present invention, by adding an illumination optical system capable of irradiating a reference beam onto all sides of an object (up, down, left, and right), a Denishk hologram can be recorded that allows the observer to see all sides of the object even if the observer changes their observation position.

[0014] FIG. 1 is a drawing provided in the description of a conventional Denisyuk type hologram (reflective hologram) recording method,

[0015] FIG. 2 is a drawing illustrating a conceptual diagram of observation of a conventional Denisyuk-type hologram (reflective hologram).

[0016] FIG. 3 is a drawing provided for the description of a Denishk hologram recording system using a cone mirror according to an embodiment of the present invention.

[0017] FIG. 4 is a diagram illustrating a conceptual diagram of observation of a hologram recorded through a Denishuk hologram recording system using a cone mirror according to an embodiment of the present invention, and

[0018] FIG. 5 is a drawing provided to describe a Denishk hologram recording system using a cone mirror according to another embodiment of the present invention.

[0019] The present invention will be described in more detail below with reference to the drawings. To clearly explain the invention, parts unrelated to the description have been omitted from the drawings, and in the drawings, the width, length, thickness, etc., of the components may be exaggerated for convenience.

[0020] Figure 1 is a diagram provided to explain the conventional Denisyuk type hologram (reflective hologram) recording method.

[0021] Referring to Fig. 1, a beam emitted from a laser is diffused through a spatial filter consisting of an objective lens and a pinhole, and the diffused beam passes through a holographic emulsion (holographic film, holographic recording medium) and then is incident on an object.

[0022] And the beam incident on the object is scattered by the surface of the object, and the scattered beam is re-incident on the holographic film.

[0023] Through this process, the beam incident on the holographic film acts as a reference beam, and the beam diffusely reflected from the object and re-incident on the holographic film becomes the object beam, thereby causing interference between the reference beam and the object beam within the holographic film. Through this process, it becomes possible to record a hologram of an object on the holographic film.

[0024] Figure 2 is a diagram illustrating the observation concept of a conventional Denisyuk-type hologram (reflective hologram).

[0025] Referring to Figure 2, the method of irradiating a laser beam onto a holographic film recorded by the conventional Denisyuk type hologram (reflective hologram) recording method is the same as the method used during recording.

[0026] At this point, an observer at an appropriate distance can observe the holographic image (optical reconstruction) of the object recorded on the holographic film.

[0027] Holograms recorded by this conventional Denisyuk-type (reflective hologram) recording method have a problem in that, upon observation, only the surface illuminated by the initial reference beam can be observed, causing areas not illuminated by the reference beam to appear black.

[0028] FIG. 3 is a drawing provided for the description of a Denishuk hologram recording system using a cone mirror according to one embodiment of the present invention, and FIG. 4 is a drawing illustrating a conceptual diagram of observation of a hologram recorded through a Denishuk hologram recording system using a cone mirror according to one embodiment of the present invention.

[0029] The Denishk hologram recording system using a cone mirror according to the present embodiment (hereinafter collectively referred to as the "Denishk hologram recording system") can record a Denishk hologram that allows an observer to see all sides of an object even if they change their observation position by adding an illumination optical system capable of irradiating a reference beam onto all sides of an object, up, down, left, and right.

[0030] To this end, the present Denishk hologram recording system may include a light source unit (110) from which a beam is emitted, and an illumination optical system capable of irradiating a reference beam to the upper surface, lower surface, left surface, and right surface of an object based on the incident beam when the beam emitted from the light source unit (110) is incident.

[0031] The illumination optical system may include a beam splitter (120), a first mirror (130), a first spatial filter (140), a holographic film (150), a second mirror (160), a second spatial filter (170), a collimating lens (180), a cone mirror (190), and a concave donut mirror (200).

[0032] The beam splitter (120) can split the incident beam into a first path and a second path when the beam emitted from the light source (110) is incident.

[0033] The first mirror (130) can adjust the path of the incident beam when the beam divided into the first path is incident.

[0034] The first spatial filter (140) can cause the incident beam to be diffused when the beam, whose path has been adjusted by the first mirror (130), is incident. Here, the illumination optical system may, in some cases, replace the first spatial filter (140) and the second spatial filter (170) by diffusing the beam with a single lens to simplify the configuration.

[0035] The holographic film (150) can transmit the incident beam to an object when the beam diffused by the first spatial filter (140) is incident.

[0036] That is, the beam transmitted through the holographic film (150) and the beam spread 360 degrees are illuminated on an object, scattered by the surface of the object, and the scattered beam can be re-incident on the holographic film (150).

[0037] Through this, the Denishuk hologram recording system can record an interference pattern on the holographic film (150) as the beam incident on the holographic film (150) and the beam scattered by the surface of an object and re-incident interfere with each other.

[0038] The second mirror (160) can adjust the path of the incident beam when the beam split into the second path is incident.

[0039] The second spatial filter (170) can cause the incident beam to be diffused when the beam whose path has been adjusted by the second mirror (160) is incident.

[0040] The collimation lens (180) can cause the incident beam to be collimated into a plane wave when the beam diffused by the second spatial filter (170) is incident.

[0041] The cone mirror (190) can cause the incident beam (plane wave) to spread 360 degrees when a beam collimated into a plane wave by the collimating lens (180) is incident.

[0042] The concave donut mirror (200) can illuminate the top, bottom, left, and right sides of an object with a beam spread 360 degrees.

[0043] Here, the incident plane wave is diffused into a donut ring shape in all 360 degrees by the cone mirror (190), and the beam diffused in 360 degrees is illuminated on all sides of the object by the concave donut mirror (200). The illuminated beam is scattered by the surface of the object and incident on the holographic film (150). Through this process, the beam incident on the holographic film (150) via the first path containing the first mirror (130) and the beam incident on the holographic film (150) after being scattered from the object interfere with each other, thereby allowing an interference pattern (hologram) to be recorded on the holographic film (150).

[0044] In summary, the Denishk hologram recording method using the Denishk hologram recording system according to the present embodiment can be configured such that when a beam emitted from a light source unit (110) is incident on a beam splitter (120), the incident beam is split into a first path and a second path by the beam splitter (120); when the beam split into the first path is incident on a first mirror (130), the path of the incident beam is adjusted by the first mirror (130); and when the beam split into the second path is incident on a second mirror (160), the path of the incident beam is adjusted by the second mirror (160).

[0045] Subsequently, when a beam whose path is adjusted by the first mirror (130) is incident on the first spatial filter (140), the incident beam is diffused by the first spatial filter (140), and when a beam whose path is adjusted by the second mirror (160) is incident on the second spatial filter (170), the incident beam is diffused by the second spatial filter (170), and when the beam diffused by the second spatial filter (170) is incident on the collimation lens (180), the incident beam can be collimated into a plane wave by the collimation lens (180).

[0046] And when a beam collimated into a plane wave is incident on a cone mirror (190), the incident beam (plane wave) is diffused 360 degrees by the cone mirror (190), and the beam diffused 360 degrees can be illuminated on the top, bottom, left, and right sides of an object by a concave donut mirror (200).

[0047] Meanwhile, when a beam diffused by the first spatial filter (140) is incident on a holographic film (150) (Holographic emulsion), the incident beam is transmitted through the holographic film (150), and the beam transmitted through the holographic film (150) and the beam diffused 360 degrees are illuminated on an object and can be scattered by the surface of the object.

[0048] Through this, the scattered beam is re-incident on the holographic film (150), and as the beam incident on the holographic film (150) and the re-incident beam interfere with each other, an interference pattern can be recorded on the holographic film (150).

[0049] As illustrated in FIG. 4, the hologram recorded by the Denishk hologram recording method described above allows for the observation of objects without limitation in all directions—up, down, left, and right—even if the observer's position changes.

[0050] FIG. 5 is a drawing provided to describe a Denishk hologram recording system according to another embodiment of the present invention.

[0051] In the Denishk hologram recording system according to the present embodiment, a collimating lens (180) that causes the incident beam to collimate into a plane wave may be omitted, and a flat donut mirror (210) that causes a beam spread 360 degrees to illuminate the top, bottom, left, and right sides of an object may be added in place of a concave donut mirror (200).

[0052] The flat donut mirror (210) can allow a beam spread 360 degrees by the cone mirror (190) to illuminate the top, bottom, left, and right sides of an object.

[0053] At this time, the beam diffused by the second space filter (170) can be diffused 360 degrees by the cone mirror (190) and transmitted as a ball wave until it is incident on the flat donut mirror (210).

[0054] The spherical waves incident by the flat donut mirror (210) illuminate all sides of the object, and the beam thus illuminated can be scattered by the surface of the object and re-incident on the holographic film (150).

[0055] Through this process, an interference pattern (hologram) can be recorded on the holographic film (150) as the beam incident on the holographic film (150) through the first path including the first mirror (130) and the beam scattered from the object and re-incident on the holographic film (150) interfere with each other.

[0056] In summary, the Denishk hologram recording method using the Denishk hologram recording system according to the present embodiment can be configured such that when a beam emitted from a light source unit (110) is incident on a beam splitter (120), the incident beam is split into a first path and a second path by the beam splitter (120); when the beam split into the first path is incident on a first mirror (130), the path of the incident beam is adjusted by the first mirror (130); and when the beam split into the second path is incident on a second mirror (160), the path of the incident beam is adjusted by the second mirror (160).

[0057] Subsequently, when a beam whose path is adjusted by the first mirror (130) is incident on the first spatial filter (140), the incident beam is diffused by the first spatial filter (140), and when a beam whose path is adjusted by the second mirror (160) is incident on the second spatial filter (170), the incident beam is diffused by the second spatial filter (170), and when the beam diffused by the second spatial filter (170) is incident on the cone mirror (190), the incident beam can be diffused 360 degrees by the cone mirror (190).

[0058] And a beam spread 360 degrees can be illuminated on the top, bottom, left, and right sides of an object by a flat donut mirror (210).

[0059] Meanwhile, when a beam diffused by the first spatial filter (140) is incident on a holographic film (150) (Holographic emulsion), the incident beam is transmitted through the holographic film (150), and the beam transmitted through the holographic film (150) and the beam diffused 360 degrees are illuminated on an object and can be scattered by the surface of the object.

[0060] Through this, the scattered beam is re-incident on the holographic film (150), and as the beam incident on the holographic film (150) and the re-incident beam interfere with each other, an interference pattern can be recorded on the holographic film (150).

[0061] In this way, the hologram recorded by the Denishk hologram recording method described above with reference to FIG. 5, just like the case described above with reference to FIG. 3 and 4, allows the object to be observed without restriction in all directions—up, down, left, and right—even if the observer's position changes.

[0062] So far, a preferred embodiment of a Denishk hologram recording method and apparatus using a cone mirror has been described in detail.

[0063] According to embodiments of the present invention, by adding an illumination optical system capable of irradiating a reference beam onto all sides of an object (up, down, left, and right), a Denishk hologram can be recorded that allows the observer to see all sides of the object even if the observer changes their observation position.

[0064] Although preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above. Various modifications are possible by those skilled in the art without departing from the essence of the invention as claimed in the claims, and such modifications should not be understood individually from the technical spirit or perspective of the present invention.

Claims

1. A light source unit from which a beam is emitted; and A Denishk hologram recording system using a cone mirror comprising: an illumination optical system capable of illuminating reference beams on the upper, lower, left, and right surfaces of an object based on the incident beam when a beam emitted from a light source is incident.

2. In Claim 1, The illumination optical system is, A beam splitter that splits the incident beam into a first path and a second path when a beam emitted from a light source is incident; A first mirror that adjusts the path of an incident beam when a beam divided into a first path is incident; A first spatial filter that causes the incident beam to spread when a beam whose path has been adjusted by a first mirror is incident; and A Denishk hologram recording system using a cone mirror, characterized by including a holographic film (Holographic emulsion) that allows an incident beam to be transmitted to an object when a beam diffused by a first spatial filter is incident.

3. In Claim 2, The beam that passes through the holographic film, Illuminates an object, scatters by the surface of the object, The scattered beam is re-incident on the holographic film, and The Denishuk holographic recording system is, A Denishk hologram recording system using a cone mirror, characterized by recording an interference pattern on a holographic film as a beam incident on the holographic film and a beam scattered by an object surface and re-incident interfere with each other.

4. In Claim 2, The illumination optical system is, A second mirror that adjusts the path of the incident beam when a beam split into a second path is incident; A second spatial filter that causes the incident beam to spread when a beam whose path has been adjusted by a second mirror is incident; A collimating lens that causes the incident beam to be collimated into a plane wave when a beam diffused by a second spatial filter is incident; A cone mirror that causes the incident beam (plane wave) to spread 360 degrees when a beam collimated into a plane wave by a collimating lens is incident; and A Denishk hologram recording system using a cone mirror, characterized by further including a concave donut mirror that allows a beam spread 360 degrees to illuminate the top, bottom, left, and right surfaces of an object.

5. In Claim 2, The illumination optical system is, A second mirror that adjusts the path of the incident beam when a beam split into a second path is incident; A second spatial filter that causes the incident beam to spread when a beam whose path has been adjusted by a second mirror is incident; A cone mirror that causes the incident beam to be diffused 360 degrees when the beam diffused by the second spatial filter is incident; and A Denishk hologram recording system using a cone mirror, characterized by further including a flat donut mirror that allows a beam spread 360 degrees to illuminate the top, bottom, left, and right surfaces of an object.

6. In Claim 5, The beam diffused by the second spatial filter, A Denishk hologram recording system using a cone mirror, characterized by being diffused 360 degrees by the cone mirror and transmitted as a ball wave until incident on a flat donut mirror.

7. A step in which, when a beam emitted from a light source is incident on a beam splitter, the incident beam is split into a first path and a second path by the beam splitter; A step in which, when a beam divided into a first path is incident on a first mirror, the path of the incident beam is adjusted by the first mirror, and when a beam divided into a second path is incident on a second mirror, the path of the incident beam is adjusted by the second mirror; A step in which, when a beam whose path is adjusted by a first mirror is incident on a first spatial filter, the incident beam is diffused by the first spatial filter, and when a beam whose path is adjusted by a second mirror is incident on a second spatial filter, the incident beam is diffused by the second spatial filter; A step in which, when a beam diffused by a second spatial filter is incident on a collimating lens, the beam incident on the collimating lens is collimated into a plane wave; A step in which a beam collimated into a plane wave is incident on a cone mirror, and the incident beam (plane wave) is diffused 360 degrees by the cone mirror; A step in which a beam diffused 360 degrees by a concave donut mirror illuminates the top, bottom, left, and right surfaces of an object; A step in which, when a beam diffused by a first spatial filter is incident on a holographic film (Holographic emulsion), the incident beam is transmitted through the holographic film; A step in which a beam transmitted through a holographic film and a beam diffused 360 degrees illuminate an object and are scattered by the surface of the object; and A method for recording a Denishk hologram using a cone mirror, comprising the step of: a scattered beam being re-incident on a holographic film, and an interference pattern being recorded on the holographic film as the beam incident on the holographic film and the re-incident beam interfere with each other.

8. A step in which, when a beam emitted from a light source is incident on a beam splitter, the incident beam is split into a first path and a second path by the beam splitter; A step in which, when a beam divided into a first path is incident on a first mirror, the path of the incident beam is adjusted by the first mirror, and when a beam divided into a second path is incident on a second mirror, the path of the incident beam is adjusted by the second mirror; A step in which, when a beam whose path is adjusted by a first mirror is incident on a first spatial filter, the incident beam is diffused by the first spatial filter, and when a beam whose path is adjusted by a second mirror is incident on a second spatial filter, the incident beam is diffused by the second spatial filter; A step in which, when a beam diffused by a second spatial filter is incident on a cone mirror, the beam incident by the cone mirror is diffused 360 degrees; A step in which a beam diffused 360 degrees by a flat donut mirror illuminates the top, bottom, left, and right surfaces of an object; A step in which, when a beam diffused by a first spatial filter is incident on a holographic film (Holographic emulsion), the incident beam is transmitted through the holographic film; A step in which a beam transmitted through a holographic film and a beam diffused 360 degrees illuminate an object and are scattered by the surface of the object; and A method for recording a Denishk hologram using a cone mirror, comprising the step of: a scattered beam being re-incident on a holographic film, and an interference pattern being recorded on the holographic film as the beam incident on the holographic film and the re-incident beam interfere with each other.

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