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AssigneeKYUNGPOOK NATIONAL UNIVERSITY INDUSTRY- ACADEMIC COOPERATION FOUNDATION and KOREA RESEARCH INSTITUTE
InventorsHak-Rin KIM, Jae-Won KA, Mi-Hye YI, Ae-Jin YEON, Kyung-Il JOO
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Disclosed are a holographic writing method and apparatus capable of re-writing (updating) holographic information and quickly writing the holographic information with high efficiency. In an embodiment, a holographic writing method for writing holographic information by emitting a beam at a holographic recording medium containing a photo-responsable polymer material having photoisomerization characteristics that change a molecular structure thereof by absorbing light energy, writes the holographic information by using a writing wavelength different from a maximum absorption wavelength in a light absorption spectrum of photoisomer molecule structures of the holographic recording medium. The maximum absorption wavelength is a wavelength at which light absorption rate is maximum in the light absorption spectrum. A difference between the light absorption rates of the photoisomer molecule structures at the writing wavelength is less than a difference between the light absorption rates of the photoisomer molecule structures at the maximum absorption wavelength.
A holographic writing method for writing holographic information by emitting a beam at a holographic recording medium containing a photo-responsable polymer material having photoisomerization characteristics that change a molecular structure thereof by absorbing light energy, the holographic writing method writes the holographic information by using a writing wavelength different from a maximum absorption wavelength in a light absorption spectrum of the photoisomer molecule structures of the holographic recording medium, wherein the maximum absorption wavelength is a wavelength at which light absorption rate is maximum in the light absorption spectrum, and
A holographic writing apparatus for writing holographic information by emitting a beam at a holographic recording medium containing a photo-responsable polymer material having photoisomerization characteristics that change a molecular structure thereof by absorbing light energy, the holographic writing apparatus comprises a light emission unit configured to write the holographic information by emitting the beam at the holographic recording medium, the light emission unit writing the holographic information by emitting the beam at a writing wavelength different from a maximum absorption wavelength in a light absorption spectrum of photoisomer molecule structures of the holographic recording medium, wherein the maximum absorption wavelength is a wavelength at which light absorption rate is maximum in the light absorption spectrum, and a difference between the light absorption rates of the photoisomer molecule structures at the writing wavelength is less than a difference between the light absorption rates of the photoisomer molecule structures at the maximum absorption wavelength.
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