JPS63316882A - Holography device - Google Patents

Abstract

PURPOSE:To reduce the size of a device by recording data on an amorphous film by using a low-power laser. CONSTITUTION:Light from the low-output laser 1 is split by a beam splitter 2 into object light 100 and reference light 101. The diffracted Fourier transformation pattern of an input figure 4 which is irradiated with the light 100 is condensed on a recording surface 6 on an amorphous magnetic thin film. The light 101 which is reflected by a reflecting mirror 3 passes through a deflector 7 for scanning and is also condensed on the surface 6 through an objective 8. A light output is controlled so as to preclude heat conduction to the film surface and a shutter 9 is used for pulse irradiation. The shutter 9 is opened at the time of reproduction, the light 100 is intercepted by a shield plate 10, and the lens 8 and deflector 7 are adjusted to irradiate a hologram surface with the light 101. Light 102 which is transmitted through the surface 6 is processed by the reverse Fourier transformation of an objective 11 to obtain a reproduced image on a reproduced image output surface 12. Consequently, the device can be reduced in side and made rewritable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a holography device, and more particularly to a bolography device for recording and reproducing information on an amorphous magnetic film using a low power laser.

[Prior Art 1] Conventionally, this type of bolography apparatus uses a high-output light source such as a ruby laser or an argon laser as a light source because the amorphous magnetic thin film used as a recording medium is a low-sensitivity medium.

[Problems to be Solved by the Invention] The conventional holography device described above uses a high-power ruby laser or argon laser as a light source, making the device expensive and large, and the light source generates high heat.
The disadvantage was that it had to be cooled.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bolography device that solves the above problems.

[Means for Solving the Problems] The present invention provides a holography device that irradiates an image with a laser beam, and focuses the output and the laser beam on a recording medium to record a hologram. a beam splitter that splits the beam into an object beam to be irradiated and a reference beam to be irradiated to the recording medium; an objective lens that condenses the reference beam; a deflector that scans the reference beam onto the recording medium;
A holography device characterized by comprising means for reproducing a hologram recorded on the recording medium.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, the holography apparatus of the present invention includes a beam splitter 2 that splits a laser beam from a low-power laser 1 into an object beam 100 that irradiates an image and a reference beam 101 that irradiates a recording surface 6; an objective lens 8 for condensing the reference beam 101 into a pencil shape, a deflector 7 for scanning the reference beam 101 onto the recording surface 6, and means for reproducing the hologram recorded on the recording surface (see FIG. 2). has. Further, 5 is an objective lens, 9 is a shutter, and 3 is reflected light.

In the embodiment, light emitted from a low-power laser 1 is split into two by a beam splitter 2 into an object beam 100 and a reference beam 101. The input figure 4, that is, the image, is irradiated with object light 100, and the diffracted Fourier transform pattern is focused by an objective lens 5 onto a recording surface 6 on an amorphous magnetic thin film serving as a recording medium. On the other hand, the reference beam 101 is reflected by a reflecting mirror 3 in order to scan the recording surface 6, and a deflector 7 that controls the direction of the mirror by electromagnetic control, for example, controls the direction of reflection of the light and scans the recording surface 6. At the same time, the recording surface 6 is recorded by the objective lens 8.
The light is focused on the top. 10 to record with roughly low output light.
Since irradiation is performed for a relatively long time of about 0 m5, the light output is controlled to prevent heat conduction in the direction of the film surface, and the shutter 9 is used for pulse irradiation. In this way, to create a hologram on the recording surface 6 made of a low-sensitivity medium such as an amorphous magnetic thin film using the low-power laser 1, the reference beam 101 is focused in a pencil shape and the power density is increased. The reference beam 101 focused in a pencil shape is scanned by the deflector 7 on the Fourier transform pattern of the input figure 4 focused on the recording surface, and the irradiation time is adjusted by the shutter 9 to record a hologram. This is what I did. In FIG. 1, the recording surface 6 is scanned by being deflected by the deflector 7 and then focused by the objective lens 8, but the order of the objective lens 8 and the deflector 7 may be reversed.

Next, in order to reproduce the hologram on the recording surface 6 mentioned above,
A shielding plate 10 is inserted in place of the input figure 4. FIG. 2 shows a principle diagram of a means for reproducing a hologram. The shutter 9 is opened and the object light 100 is shielded by the shielding plate 11,
A reference beam 101 is irradiated onto the hologram. At that time, the objective lens 8 may be moved back and forth or the reference beam 10 may be removed.
1 is adjusted together with the deflector 7 so that the hologram surface can be sufficiently irradiated with the hologram surface.

The light 102 transmitted through the recording surface 6 is subjected to inverse Fourier transform by the objective lens 11, and a reproduced image 17 of the input figure 4 is formed on the focal point of the objective lens 11 on the output surface 12. Furthermore, the above hologram recording and reproduction can be performed on the same optical system.

[Effects of the Invention] As described above, the present invention records a hologram on an amorphous film using a low-power laser, such as a semiconductor laser, so the holography device becomes smaller and cheaper. Conventionally, holograms were recorded on photographic plates, which required chemical processing such as developing and fixing, and was impossible to replace. However, with the device of the present invention, holograms can be recorded and reproduced almost in real time. This has the effect of providing a holographic device that is rewritable, compact, and inexpensive as described above.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for hologram recording including an optical path showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram showing hologram reproducing means. 1...Low output laser 2...Beam splitter 3...Reflector 4...Input figure 5, 8.
11... Objective lens 6... Recording surface 7... Deflector 9... Shutter 10... Shielding plate 12... Reproduction image output surface 100... Object light 101... Reference light

Claims (1)

[Claims] (1) In a holography device that irradiates an image with a laser beam and records a hologram by focusing the output and the laser beam on a recording medium, the laser beam is irradiated on the object beam that irradiates the image and the recording medium. a beam splitter that splits the reference beam into a reference beam; an objective lens that focuses the reference beam; a deflector that scans the reference beam onto the recording medium; and a means for reproducing the hologram recorded on the recording medium. A holography device comprising: