Abstract
Regularities of color center formation in the lead silicate glasses under photoexcitation have been studied. It is shown for the first time that the long-wave boundary of carrier mobility of vitreous media can be placed considerably higher then the fundamental absorption edge of the material matrix. For this reason the detection of linear formation of color centers in the lead silicate glasses is not possible. Their coloration arises only from the multi-photon matrix ionization and the excitation occurs through virtual states that are located in the fundamental absorption region. The numerical estimates of the three-photon absorption coefficient and the forming color centers cross-section at 527 nm are obtained for the glasses with different content of lead oxide.
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