Formation of luminescence centers and nonlinear optical effects in silver-containing glasses under femtosecond laser pulses

被引:9
作者
Klyukin, D. A. [1 ]
Sidorov, A. I. [1 ]
Ignatiev, A. I. [1 ]
Nikonorov, N. V. [1 ]
Silvennoinen, M. [2 ]
Svirko, Yu. P. [2 ]
机构
[1] ITMO Univ, St Petersburg 197101, Russia
[2] Univ Eastern Finland, Joensuu, Finland
关键词
THERMO-REFRACTIVE GLASSES; PHOTOSENSITIVE GLASS; SILICATE-GLASSES; CLUSTERS;
D O I
10.1134/S0030400X15090143
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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.
引用
收藏
页码:456 / 459
页数:4
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