Unlock instant, AI-driven research and patent intelligence for your innovation.

Wavelength control method controlling the wavelength for recording or reproducing information with holography, hologram information processing apparatus and hologram recording medium

A technology of holographic recording medium and information processing device, which is applied in the direction of optical recording/reproduction, information storage, holographic technology, etc., which can solve the problems of inaccurate adjustment and inability to detect special patterns, etc., and achieve high-speed wavelength adjustment and simple Effects of wavelength adjustment and shortening of adjustment time

Inactive Publication Date: 2008-06-25
SHARP KK
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0041] However, in conventional examples, when the recording wavelength and the reproducing wavelength deviate greatly, a special pattern cannot be detected, or it takes time until the pattern is detected.
In addition, in the state where the wavelength cannot be adjusted sufficiently, even if tilt, tracking, and focus control are performed, accurate adjustment may not be possible.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wavelength control method controlling the wavelength for recording or reproducing information with holography, hologram information processing apparatus and hologram recording medium
  • Wavelength control method controlling the wavelength for recording or reproducing information with holography, hologram information processing apparatus and hologram recording medium
  • Wavelength control method controlling the wavelength for recording or reproducing information with holography, hologram information processing apparatus and hologram recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] A schematic configuration of a holographic information processing device according to Embodiment 1 of the present invention will be described with reference to FIG. 1 .

[0090] Referring to Fig. 1, the holographic information processing device according to Embodiment 1 of the present invention has a variable-wavelength laser source 1 for recording and reproducing, a first beam splitter 2, a first reflection mirror 3, a spatial light modulator 4, and a first relay Lens 5 (5a, 5b), second mirror 6, second beam splitter mirror 7, second relay lens 8 (8a, 8b), objective lens 9, imaging element 10, third mirror 11, first gamma Neyer lens 12, lens unit 13 (13a, 13b), second galvanic lens 14, third beam splitter 15, lens 16, photosensitive element 17, signal processing circuit 25, and wavelength adjustment control unit 26.

[0091] The light emitted by the wavelength-variable laser 1 is reflected by the first beam splitter 2 and the first reflector 3, reflected by the spatial...

Embodiment 2

[0180] A hologram recording medium according to Embodiment 2 of the present invention will be described with reference to FIG. 10 .

[0181] Referring to FIG. 10 , the holographic recording medium 21 of Example 2 of the present invention differs from the holographic recording medium 20 of FIG. 3 in that a wavelength control pattern 82 is provided instead of the wavelength adjustment patterns 80 and 81 .

[0182] In this example, a wavelength control pattern is recorded at the same site using a plurality of wavelengths (in a wavelength multiplexed manner).

[0183] In the first embodiment described above, a case was described in which the wavelength control pattern is recorded by changing the amount of recording light according to a predetermined rule when recording is performed at a plurality of wavelengths. Furthermore, in Embodiment 1, all the micromirrors of the spatial light modulator are set to be the same, so no information that can be distinguished from other informatio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

For controlling a wavelength of laser light of a wavelength-variable laser (step S 0 ), an optical system or a hologram recording medium is moved (step S 1 ) to attain a state in which a light beam enters a wavelength control pattern. Reference light that is the laser light is applied to the wavelength control pattern (step S 2 ). Then, a light receiving element observes reproduction light from the wavelength control pattern (step S 3 ). A wavelength of the reference light that is the laser light is minutely changed. A quantity of the reproduction light changes with the wavelength. The quantity of the reproduction light is monitored to obtain a specific wavelength lambda0 (a rotation angle of a diffraction grating 52 ) maximizing the quantity of the reproduction light (step S 4 ). The wavelength of the laser light of the wavelength-variable laser light source is adjusted (step S 5 ).

Description

technical field [0001] The present invention relates to an information processing device and an information recording medium. Specifically, the present invention relates to a holographic information processing device and a holographic recording medium for recording and / or reproducing information using holography. Background technique [0002] In the past, the object light containing image information and the reference light for recording are generally overlapped inside the holographic recording medium, and the interference pattern formed at this time is written into the holographic recording medium, so as to record information on the holographic recording medium by holography. holographic record. [0003] When reproducing information recorded on a holographic recording medium, the holographic recording medium is irradiated with reproduction reference light to reproduce an image by diffraction of an interference pattern. [0004] In recent years, large-volume holography, es...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/125G11B7/0065G11B7/007G03H1/02
CPCG03H2222/10G03H1/22G11B7/00736G03H1/2286G11B7/126G03H2001/2289G11B7/00772G11B7/0065
Inventor 金泽泰德上山彻男
Owner SHARP KK