Abstract
It is experimentally shown that irradiation of silver-containing silicate glass by IR femtosecond laser pulses leads to generation of free electrons in glass as a result of multiphoton ionization. Free electrons, being captured by charged molecular silver clusters, transform them into the neutral state, as a result of which the luminescence intensity along the laser-pulse track significantly increases. When a laser pulse propagates in glass, cubic nonlinearity dominates in the initial portion of the path, which leads to pulse self-focusing and filamentation. In the final portion of the path, the dominant process is self-defocusing, which is caused by the local decrease in the refractive index as a result of multiphoton generation of free electrons.
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Original Russian Text © D.A. Klyukin, A.I. Sidorov, A.I. Ignatiev, N.V. Nikonorov, M. Silvennoinen, Yu.P. Svirko, 2015, published in Optika i Spektroskopiya, 2015, Vol. 119, No. 3, pp. 464–468.
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Klyukin, D.A., Sidorov, A.I., Ignatiev, A.I. et al. Formation of luminescence centers and nonlinear optical effects in silver-containing glasses under femtosecond laser pulses. Opt. Spectrosc. 119, 456–459 (2015). https://doi.org/10.1134/S0030400X15090143
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DOI: https://doi.org/10.1134/S0030400X15090143