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Spatial phase modulation from permanent memory in doped glass.

Thandar Myint1, R R Alfano

  • 1Institute for Ultrafast Spectroscopy and Lasers, Physics Department, The City Collegeand Graduate School of City University of New York, 160 Convent Avenue,New York, New York 10031, USA. tmyint2009@gmail.com

Optics Letters
|April 23, 2010
PubMed
Summary
This summary is machine-generated.

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High-intensity picosecond laser pulses create permanent optical memory in doped glass. This memory generates diffraction rings when probed by a laser beam, matching theoretical predictions.

Area of Science:

  • Materials Science
  • Optics
  • Laser Physics

Background:

  • Photoinduced effects in doped glass can create permanent optical changes.
  • High-intensity lasers can modify material properties, leading to applications in data storage.

Purpose of the Study:

  • To investigate the formation and optical properties of photoinduced permanent memory in doped glass.
  • To analyze the diffraction patterns generated by laser-induced refractive index changes.

Main Methods:

  • Doped glass samples were exposed to high-intensity picosecond laser beams (1 mm spot size).
  • Permanent memory regions with spatially variable refractive indices were created.
  • Diffraction patterns were generated using a probe laser beam passing through the memory regions.

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  • Observed diffraction patterns were compared with calculations using Kirchhoff's diffraction integral.

    • Main Results:

    • Diffraction rings were observed originating from the photoinduced permanent memory in doped glass.
    • The laser-induced memory manifested as a void with a spatially variable refractive index.
    • The experimental diffraction patterns showed satisfactory agreement with theoretical calculations.

    Conclusions:

    • Picosecond laser irradiation can reliably create permanent optical memory in doped glass.
    • The resulting refractive index modulation leads to observable diffraction phenomena.
    • Kirchhoff's diffraction integral accurately predicts the observed beam patterns, validating the memory model.