Abstract:
PROBLEM TO BE SOLVED: To provide a method and system for recording to and/or reading out from holographic media.SOLUTION: A method for recording holographic media and/or holographic master data masks includes recording at least a first hologram or information layer with a first holographic medium (e.g., a "submaster") and recording at least a second information layer with a second holographic medium (e.g., a second "submaster"). The first information layer and the second information layer from the first and second holographic media are then sequentially reconstructed and stored with a single holographic master medium (e.g., a "master").
Abstract:
PROBLEM TO BE SOLVED: To control a laser beam that irradiates a hologram recording medium in accordance with the energy value of the laser beam from a laser device. SOLUTION: A hologram device allows a coherent data beam corresponding to the data to be recorded and a coherent reference beam to enter a hologram recording medium and records the data as a hologram in the recording medium, wherein the device is equipped with a photodetection part to detect intensity of light in at least one of the data beam and the reference beam, a decision part to decide from the detected intensity of light whether or not the intensity of the data beam and the reference beam reaches a reference value capable of forming a hologram having predetermined diffraction efficiency, and an interruption part to interrupt incidence of at least one of the data beam and the reference beam when the decision part decides that the intensity of light reaches the reference value. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a system for recording on a holography storage medium and for reading out from the holography storage medium. SOLUTION: The step for irradiating a data mask with a beam to record the generated modulation beam on the holography storage medium comprises a step in which the data mask includes an information layer divided into a multitude of data pages and a step in which the multitude of data pages of the data mask are simultaneously recorded on the holography storage medium, by propagating a reference beam to the holography storage medium. COPYRIGHT: (C)2004,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide a high-density holographic data storage medium.SOLUTION: The present invention relates to a system, as well as articles and a holographic recording medium comprising the system, where the system comprises: a polymerizable component comprising at least one photoactive polymerizable material; and a photoinitiator component comprising at least one photoinitiator for causing the polymerizable component to polymerize to thereby form a plurality of holographic gratings when activated by exposure to a photoinitiating light source; wherein when a portion of the polymerizable component has been polymerized to form at least one holographic grating, the unpolymerized portion of the polymerizable component is resistant to further polymerization when the polymerizable component is not exposed to the photoinitiating light source. The present invention also provides methods for forming at least one holographic grating in a holographic recording medium having the photopolymerizable system.
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a composition for carrying out rapid mass production of holographic recording articles of high performance. SOLUTION: To prepare a holographic recording articles of high performance based on a two-component urethane matrix system, for examples, polyols and all additives must be virtually free of moisture contents. Deaeration must be carried out, once isocyanate and polyols including catalysts and all other components are mixed together, to eliminate all entrapped air that is introduced into a mixture during mixing. The deaeration takes time, and the urethane reaction must not be allowed to take place until all air bubbles are evacuated from the isocyanate-polyol mixture. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for generating a reference beam having uniform intensity in a part outside of the central 60% of the power by allowing the incident reference beam for a holographic writing medium to be subjected to apodization. SOLUTION: The method for allowing the incident reference beam for a holographic writing medium to be subjected to apodization includes a process of allowing the incident reference beam to enter an apodizer and a process of generating a modified reference beam having a substantially uniform intensity profile on a region of the holographic writing medium. The axis of the incident reference beam is inclined from the normal line at a point in the region. The region contains an overlapped area of the modified reference beam and an object beam. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To provide an optical system structure which increases optical components to be shared by a signal beam optical path and a reference beam optical path. SOLUTION: To increase the proportion of shared optical components, a signal beam 206 and a reference beam 212 are made incident on the PBS prism 207 as almost parallel beams, and a concave lens 231 is used to make a reference beam of the almost parallel beams emitted from the PBS prism to be incident on the objective lens 210. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To stabilize the wavelength of a hologram apparatus using a simple mechanism. SOLUTION: The hologram apparatus has a temperature regulator for regulating the temperature of a semiconductor laser element in a semiconductor laser device, having the semiconductor laser element for emitting an oscillated laser beam, a laser-beam splitter for splitting the oscillated laser beam emitted from the semiconductor laser element into first and second beams forming different optical paths from each other, and a temperature-regulation controller which determines the control quantity of the temperature regulator so as to make constant the space between the adjacent fringes of the plurality of interference fringes obtained by the first and second beams interfering with each other. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical filter which enables inexpensive tuning and has a wide tuning range easily and accurately controlled. SOLUTION: The tunable optical device is provided with one or more filters, wherein at least one filter comprises one or more elastimers and one or more gratings. A method for adding or dropping one or more channels in a wavelength division multiplexing communication systems comprises a process for illuminating a plurality of channels on one or more filters, a process for expanding or contracting the one or more filters, and a process for adding or dropping one or more channels to or from the plurality of channels, wherein at least one filter comprises one or more elastimers and one or more gratings.