Accession Number : ADP008269

Title :   Time-Domain Optical Data Storage Using Eu3+ Ions in Crystals,

Corporate Author : NIPPON TELEGRAPH AND TELEPHONE CORP TOKYO

Personal Author(s) : Mitsunaga, Masaharu

Report Date : 22 MAY 1992

Pagination or Media Count : 3

Abstract : The photon-echo memory, or the time-domain optical data storage, resembles the hole-burning memory in that the inhomogeneous absorption line of a material is employed as a storage medium and the information is stored in it as a frequency-dependent absorption change with the resolution determined by the homogeneous width. Having the common memory capacity N given by the inhomogeneous-to-homogeneous width ratio, both types of memories share common problems like low-temperature operation, spectral diffusion and so on. Although a storage medium is common, storage techniques are definitely different for the two memories. The photon-echo memory utilizes the temporal interference effect between a reference pulse and a data pulse and their interference pattern is stored as a population grating in the frequency domain. In this sense this is a time-domain analog of holography where the spatial interference pattern between a reference beam and a data beam is stored in a medium as a population grating in the real space. Like the spatially diffracted beam from the read beam gives the information stored in the hologram, the temporally diffracted pulse', or the photon echo, after the read pulse can give the information stored in the inhomogeneous distribution.

Descriptors :   *OPTICAL DATA, *STORAGE, *TIME DOMAIN, *IONS, *CRYSTALS, *EUROPIUM, ABSORPTION, ANALOGS, COMBUSTION, DIFFUSION, DISTRIBUTION, ECHOES, FREQUENCY, FREQUENCY DOMAIN, HOLOGRAMS, INTERFERENCE, LOW TEMPERATURE, MATERIALS, OPERATION, PATTERNS, PHOTONS, POPULATION, PULSES, RATIOS, RESOLUTION, TEMPERATURE, TIME, WIDTH, MEMORY DEVICES, INFORMATION PROCESSING, INCOHERENCE, READ WRITE MEMORIES, MOLECULAR SPECTROSCOPY.

Subject Categories : Electrooptical and Optoelectronic Devices
      Computer Hardware
      Inorganic Chemistry
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE