Abstract
One difficulty for the successful implementation of holographic data storage is having the ability to read data without affecting the data. Thermal fixing[1] as well as two-photon techniques[2] have been investigated as possible solutions. Reading data with a wavelength other than that which the data had been written is another viable alternative. Furthermore, choosing a reading wavelength that corresponds to a laser of a more favorable size, price, or ease of use could also be a benefit of such a system. Külich has previously investigated how to minimize the error induced due to reading and writing using different wavelengths by reading data with a spherical beam[3]. Psaltis et al. later introduced a formatting technique to allow a page to be read with a different wavelength by writing the page of data in pieces using several reference angles[4]. For digital data to be accurately read with an acceptable amount of mismatch, a three-dimensional mapping of the data must be applied to a system using this formatting technique. Optimization of such a system then requires the investigation of mismatch as a parameter effecting the diffraction efficiency.
© 1996 Optical Society of America
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