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    • 5. 发明授权
    • Method and apparatus for positioning a light beam on a holographic media
    • 将光束定位在全息介质上的方法和装置
    • US5621549A
    • 1997-04-15
    • US517462
    • 1995-08-21
    • Stephen R. Redfield
    • Stephen R. Redfield
    • G03H1/28G11B7/0065G11B7/085G02B11/26G02B11/28
    • G11B7/0065G03H1/28G11B7/08564
    • An apparatus for positioning a data and reference beam onto the surface of a holographic storage media (10) includes a laser (16) for generating the reference beam, and a first reflecting surface (18) for positioning the output of the laser (16) along the y-axis. The beam is split into a data beam and a reference beam by a beam splitter (24) with the data beam directed toward an SLM (36) and the reference beam (26) directed toward an angle multiplexing reflective surface (40). The data beam during a record operation is reflected from the surface of the SLM (36) to a transform lens (34) and then to a column (35) on the surface of a holographic storage media (10). The reference beam is reflected from a reflective surface (40) at a predetermined angle determined by the position of the reflective surface (40) to an HOE (46) for redirection to the surface of the storage media (10) to interfere with the data beam. During a data reconstruction operation, only the reference beam is generated. This results in a reconstructed image being directed toward an imaging lens (52) and then to a detector (54).
    • 用于将数据和参考光束定位在全息存储介质(10)的表面上的装置包括用于产生参考光束的激光器(16)和用于定位激光器(16)的输出的第一反射表面(18) 沿y轴。 通过分束器(24)将光束分成数据束和参考光束,数据束指向SLM(36),而参考光束(26)指向角度复用反射表面(40)。 记录操作期间的数据光束从SLM(36)的表面反射到变换透镜(34),然后被反射到全息存储介质(10)的表面上的色谱柱(35)。 参考光束从反射表面(40)以由反射表面(40)的位置确定的预定角度反射到HOE(46),以重定向到存储介质(10)的表面以干扰数据 光束。 在数据重建操作期间,仅产生参考光束。 这导致将重建的图像指向成像透镜(52),然后指向检测器(54)。