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Reduction of intensity gradient in two-dimensional holographic data page

机译:降低二维全息数据页面中的强度梯度

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摘要

The data transfer rate as well as recording data density of holographic data storage systems can be further improved by utilizing a high-numerical-aperture (NA) objective lens. Meanwhile, a high-NA lens is likely to develop an inhomogeneous intensity profile of a holographic data page. In our previous experiment employing an objective lens with NA of 0.6, a steep intensity gradient was observed over an area of a reproduced data page; consequently, the quality of the data channel degraded. We introduce a readout scheme that maximizes a coupling constant; the constant was originally defined in the coupled wave theory. Owing to the readout scheme, the intensity gradient in the reproduced holographic data page was successfully reduced. In addition to the constant, we found that the angle dependences of the transmittance and reflectance of a holographic medium were also a factor for the development of the intensity gradient and should be suppressed to reduce the gradient further. (c) 2018 The Japan Society of Applied Physics
机译:通过使用高数值孔径(NA)物镜,可以进一步提高全息数据存储系统的数据传输速率以及记录数据密度。同时,高NA镜头可能会形成全息数据页面的不均匀强度分布。在我们以前的实验中,使用物镜的NA为0.6,在复制的数据页的整个区域观察到陡峭的强度梯度。因此,数据通道的质量下降。我们引入一种读出方案,该方案可使耦合常数最大。该常数最初是在耦合波理论中定义的。由于读出方案,成功地减小了复制的全息数据页中的强度梯度。除常数外,我们发现全息介质的透射率和反射率的角度依赖性也是强度梯度发展的一个因素,应加以抑制以进一步减小梯度。 (c)2018年日本应用物理学会

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  • 来源
    《Japanese journal of applied physics》 |2018年第9s1期|09SC03.1-09SC03.7|共7页
  • 作者单位

    Hitachi Ltd, Res & Dev Grp, Ctr Technol Innovat, Yokohama, Kanagawa 2440817, Japan;

    Hitachi Ltd, Res & Dev Grp, Ctr Technol Innovat, Yokohama, Kanagawa 2440817, Japan;

    Hitachi Ltd, Res & Dev Grp, Ctr Technol Innovat, Yokohama, Kanagawa 2440817, Japan;

    Hitachi Ltd, Res & Dev Grp, Ctr Technol Innovat, Yokohama, Kanagawa 2440817, Japan;

    Hitachi Ltd, Res & Dev Grp, Ctr Technol Innovat, Yokohama, Kanagawa 2440817, Japan;

    Hitachi Ltd, Res & Dev Grp, Ctr Technol Innovat, Yokohama, Kanagawa 2440817, Japan;

    Hitachi LG Data Storage Inc, New Opt Business Team, Minato Ku, Tokyo 1080022, Japan;

    Hitachi LG Data Storage Inc, New Opt Business Team, Minato Ku, Tokyo 1080022, Japan;

    Hitachi LG Data Storage Inc, New Opt Business Team, Minato Ku, Tokyo 1080022, Japan;

    Hitachi LG Data Storage Inc, New Opt Business Team, Minato Ku, Tokyo 1080022, Japan;

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