Three-Dimensional Optical Data Storage in Vitreous Silica.

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  • Watanabe Mitsuru
    Department of Ecosystem Engineering, Faculty of Engineering, The University of Tokushima, 2–1 Minamijyosanjima, Tokushima 770–8506, Japan
  • Sun Hongbo
    Satellite Venture Business Laboratory, The University of Tokushima, 2–1 Minamijyosanjima, Tokushima 770–8506, Japan
  • Juodkazis Saulius
    Satellite Venture Business Laboratory, The University of Tokushima, 2–1 Minamijyosanjima, Tokushima 770–8506, Japan
  • Takahashi Toshimasa
    Department of Ecosystem Engineering, Faculty of Engineering, The University of Tokushima, 2–1 Minamijyosanjima, Tokushima 770–8506, Japan
  • Matsuo Shigeki
    Department of Ecosystem Engineering, Faculty of Engineering, The University of Tokushima, 2–1 Minamijyosanjima, Tokushima 770–8506, Japan
  • Suzuki Yoshihisa
    Opto–technology Laboratory, The Furukawa Electric Co., Ltd., 6 Yawata–kaigandori, Ichihara, Chiba 290–8555, Japan
  • Nishii Jyunji
    Optical Material Division, Osaka National Research Institute, 1–8–31 Midorigaoka, Ikeda, Osaka 563–8577, Japan
  • Misawa Hiroaki
    Department of Ecosystem Engineering, Faculty of Engineering, The University of Tokushima, 2–1 Minamijyosanjima, Tokushima 770–8506, Japan
  • Swinburne University of Technology

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  • Three Dimensional Optical Data Storage

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To achieve high bit densities (>10 GB/cm3) in optical memory, we accomplished a three-dimensional optical data storage system using vitreous silica as the recording material. We succeeded in high-density optical recording by focusing pulsed laser beams of 532 nm (full width at half maximum [FWHM] 30 ps) and 400 nm (150 fs). A recording density of 72.9 GB/cm3 was achieved, which corresponded to that of 100 compact disks, on a glass plate of (2× 2) cm2 and 2.2 mm thickness. We found that the optical damage of silica occurs within 400 ps after irradiation by a single pulse for 30 ps at 532 nm. Three photoluminescence bands were found in the photomodified silica at 283 nm, 468 nm and 558 nm. All the three bands showed similar photoluminescence excitation spectra, i.e. a peak related to oxygen vacancy absorption at 250 nm.

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