Laser induced charge in glass?

  1. i am just being curious about some details about how laser can induce charges inside a glass bulk? Does anyone else have more knowledge on this?
     
  2. jcsd
  3. Bobbywhy

    Bobbywhy 1,908
    Gold Member

    Tao Tao, Welcome to Physics Forums!

    Here are two papers that describe "charges" inside glasses. Note, please, that these are not electrical charges, and that the glass is highly specialized.

    "Three-dimensional direct femtosecond laser writing of second-order nonlinearities in glass

    In this Letter, we propose another approach to create inside a silver-containing zinc phosphate glass a laser induced frozen charge gradient, similar to the thermal poling process, but localized with three-dimensionality.

    The glass used for this study is a photosensitive zinc and gallium phosphate glass (40P2O5 −
    55ZnO − 4Ga2O3 − 1Ag2O) containing 1% (mol.%) of silver oxide."

    http://www.creol.ucf.edu/Research/Publications/5555.pdf

    and

    "LASER-INDUCED PHOTOCONDUCTIVITY IN SILICATE GLASSES BY MULTIPHOTON EXCITATION, A PRECURSOR OF DIELECTRIC BREAKDOWN AND MECHANICAL DAMAGE

    A Q-switched ruby laser is used to induce photoconductivity in soda glass, fused quartz, and quartz crystal. The number of charge carriers produced per laser pulse of 1027 photons cm−2 s−1 is accounted for by multiphoton ionization of nonbridging oxygens in the silicon oxygen network."

    http://www.nrcresearchpress.com/doi/abs/10.1139/p67-317?journalCode=cjp#.UhK5gL7D_Dc
     
  4. I did not know that

    laser generating charges? I did not know that.
     
  5. well, actually, it is laser induces charge in specified materials, and these charges could be trapped inside a small bulk of the material
     


  6. thank you! i will read yours and we can talk about it later. Can that kind of charge in your material be trapped inside? and do you got some idea on how the charges distribute? and how can we see/ sense them?
     
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