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Journal of the Optical Society of America B

Quasi-two-dimensional time-domain color memories: process limitations and potentials

William Randall Babbitt, THOMAS W. MOSSBERG

Published Oct 1, 1994• 25 citations
Publisher

Abstract

Coherent-transient-based, frequency-selective, optical memories (time-domain optical memories) have been proposed as a means of achieving ultrahigh-density and high-speed optical storage. An analogy with existing storage devices suggests an implementation that uses discrete spatial storage cells arrayed on a two-dimensional surface. We analyze fundamental process potential relating to data storage density for memories of this particular configuration.

DOI
10.1364/josab.11.001948

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Time-and-space-domain holography [1,2] by stimulated photon echoes [3] provides a means of storing temporal and spatial properties of an ultrafast-varying light signal and recalling its authentic replica at any later moment. The possibility of recording complex time shapes of light pulses, which also means time-domain optical data storage, is based on the ability of frequency-selective absorbers to store with high accuracy the temporal Fourier components of the incident light [1-3]. The time-domain frequency-selective optical storage of binary or analog data is an alternative approach to the concept of frequency-selective high-density data storage that provides a parallel ultrafast data storage and processing in the frequency domain. The shortest detail of the signal to be stored is limited by the reverse inhomogeneous bandwidth of the storing media which reaches 10-100 fs for frequency-selective materials while the duration of the signal is limited by phase relaxation time T2 (usually 10−9-10−6s).