Time-Domain Holographic Digital Memory

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Science  03 Oct 1997:
Vol. 278, Issue 5335, pp. 96-100
DOI: 10.1126/science.278.5335.96

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An optical storage technique based on time-domain holography for the rapid recording and readout of page-formatted digital data is demonstrated. Storage of 356 kilobits of data was achieved at a single spatial location in a rare-earth–doped crystal. The digital data were recorded and accurately retrieved at a peak rate of 300 megabits per second without the use of error-correcting codes. The system's raw bit error rate is about 10 7. This low bit error rate was achieved by a detection scheme for extraction of binary data. These results have implications for dynamic optical memory.

  • * Permanent address: Department of Computer Science and Mathematics, Carleton College, Northfield, MN 55057, USA.

  • To whom correspondence should be addressed. E-mail: kachru{at}

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