Holographic multiplex recording method, and holographic recording apparatus and holographic recording medium employing the method

a multiplex recording and recording method technology, applied in the field of holographic multiplex recording method, holographic recording apparatus and holographic recording medium, can solve the problems of inconsistency in recording data rate, easy to be complicated control, nonlinear relationship between refractive index modulation degree and exposure time t, etc., to achieve equal non-uniform recording and constant recording data rate

Inactive Publication Date: 2007-08-09
TDK CORPARATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0008] The present invention has been made to solve the abovementioned problems. It is therefore an object of the invention to provide a holographic multiplex recording method which can provide a

Problems solved by technology

However, since a photosensitive component in the photosensitive material decreases as the multiplex recording proceeds causing degradation in photosensitivity (recording sensitivity) to a laser beam, the refractive index modulation degree and the exposure time t exhibit a nonlinear relationship.
Accordingly, this causes control to be readily complicated and the time required for recording to vary for each data page, r

Method used

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  • Holographic multiplex recording method, and holographic recording apparatus and holographic recording medium employing the method
  • Holographic multiplex recording method, and holographic recording apparatus and holographic recording medium employing the method
  • Holographic multiplex recording method, and holographic recording apparatus and holographic recording medium employing the method

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first embodiment

[0029] Now, with reference to FIG. 1, a description will be given of a holographic recording apparatus 10 to which a holographic multiplex recording method according to a first embodiment of the present invention is applied.

[0030] The holographic recording apparatus 10 is configured to include: a laser beam source 12; a polarizing beam splitter 14 for transmitting one of linear polarizations having orthogonal planes of oscillation of a laser beam from the laser beam source 12, for example, a p-polarized component, and for reflecting an s-polarized component; an object optical system 18 for guiding the p-polarized component having transmitted through the polarizing beam splitter 14 to a holographic recording medium 16; and a reference optical system 20 for guiding the s-polarized component reflected from the polarizing beam splitter 14 to the holographic recording medium 16.

[0031] The object optical system 18 is configured to include: a beam expander 18A for expanding the beam diam...

second embodiment

[0043] Now, with reference to FIG. 3, an explanation will be given to a holographic multiplex recording method according to a second embodiment of the present invention. Note that FIG. 3 schematically shows some of pixels of the SLM 18C according to the aforementioned first embodiment.

[0044] As with the aforementioned first embodiment, an example will be discussed where four data pages are recorded by angle multiplexing on the recording layer 16A of the holographic recording medium 16.

[0045] To begin with, the number of pixels of the SLM 18C to be allocated to one bit of information is set to one pixel as shown in FIG. 3(A), and the object beam is intensity modulated by the SLM 18C to record the first data page.

[0046] Then, when the recording sensitivity of the holographic recording medium 16 has been reduced to less than or equal to ¼ (=½2) of the initial value of the recording sensitivity at the time of recording the second data page, the number of pixels of the SLM 18C to be a...

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Abstract

A holographic multiplex recording method which can keep a recording data rate constant and equalize nonuniformity in recording due to vibrations or the like, and a holographic recording apparatus and a holographic recording medium, which employ the method are provided. In a process of multiplex-recording information, the time of exposure to a laser beam per data page is kept constant, and the laser output power of the laser beam is increased in accordance with a decrease in recording sensitivity of the holographic recording medium.

Description

TECHNICAL FIELD [0001] The present invention relates to a holographic multiplex recording method, and a holographic recording apparatus and a holographic recording medium which employ the method. BACKGROUND ART [0002] As shown in FIG. 4, conventionally suggested as one of holographic recording methods is a holographic multiplex recording method based on angle multiplexing, in which the incident angle of a reference beam 6 is modulated while the incident angle of an object beam 4 is kept constant with respect to a recording layer 2A in a holographic recording medium 2 (e.g., see Japanese Patent Laid-Open Publication No. 2003-178460). [0003] Note that since such angle multiplex recording allows a number of multiplexed holograms to be provided in the same area of a recording material, the amount of exposure for recording needs to be increased step by step as the multiplex recording proceeds. Thus, “scheduling of recording” is carried out to control the amount of exposure for recording ...

Claims

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Application Information

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IPC IPC(8): G03H1/10G03H1/04G03H1/28G11B7/0065G11B7/125G11B7/128
CPCG03H1/265G03H1/28G11B7/128G11B7/083G11B7/0065
Inventor TSUKAGOSHI, TAKUYAYOSHINARI, JIROMIURA, HIDEAKIMIZUSHIMA, TETSURO
Owner TDK CORPARATION
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