Crosstalk in photoluminescence readout of three-dimensional memory in vitreous silica by one- and two-photon excitation

Mitsuru Watanabe, Saulius Juodkazis, Shigeki Matsuo, Junji Nishii, Hiroaki Misawa

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18 Citations (Scopus)


We report the readout of three-dimensional (3-D) memory of bits from their photoluminescence (PL). The bits were recorded inside vitreous silica by optical damage (micro-explosion), which was induced by 150fs single pulse irradiation at the focal point. The bit can be written by 0.2-0.5 μJ energy pulses at 400 nm or 800 nm (the pulse energy was given at the irradiation point and had an intensity of about 1015W/cm2 when a high numerical aperture of NA = 1.3 objective lens was used for recording). The readout was obtained by the PL of the 3-D pattern of damaged bits, which were excited by quasi-continuos (repetition rate of 82 MHz) fs-irradiation at much lower pulse intensity (by a factor of 106) in order to exclude secondary damage. The readout was performed by the oil-immersion objective lens of NA = 1.3. The wavelength of PL excitation was 400 nm for one-photon and 800 nm for two-photon excitation of PL with the single pulse energy of less than 1 pJ. We found that the crosstalk of PL readout is the same as that for the transmission imaging and measures 4 μm in the inter-plane distance for the case of one-photon excitation and can be reduced to 3 μm when a reflection-type readout system is used together with two-photon excitation (theoretical axial bit size for fabrication of a given optics was 1.4 μm). Two-photon readout of 3-D memory in silica is demonstrated for the first time.

Original languageEnglish
Pages (from-to)6763-6767
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number12 A
Publication statusPublished - 2000 Dec 1
Externally publishedYes


  • Defects in glass
  • Femtosecond laser fabrication
  • Optical properties
  • Photoluminescence
  • Three-dimensional optical data storage
  • Vitreous silica

ASJC Scopus subject areas

  • General Engineering
  • General Physics and Astronomy


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