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Proceedings Paper

Generation of color centers by femtosecond laser pulses in wide-bandgap materials
Author(s): Sergey M. Avanesyan; Stefano Orlando; Steve C. Langford; J. Thomas Dickinson
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Paper Abstract

The high instantaneous powers associated with femtosecond lasers can color many nominally transparent materials. Although the excitations responsible for this defect formation occur on subpicosecond time scales, subsequent interactions between the resulting electronic and lattice defects complicate the evolution of color center formation and decay. These interactions must be understood in order to account for the long term behavior of coloration. In this work, we probe the evolution of color centers produced by femtosecond laser radiation in soda lime glass and single crystal sodium chloride on time scales from microseconds to hundreds of seconds. By using an appropriately chosen probe laser focused through the femtosecond laser spot, we can follow the changes in coloration due to individual or multiple femtosecond pulses, and follow the evolution of that coloration for long times after femtosecond laser radiation is terminated. For the soda lime glass, the decay of color centers is well described in terms of bimolecular annihilation reactions between electron and hole centers. Similar processes appear to operate in single crystal sodium chloride. We report also fabrication of permanent periodic patterns in soda lime glass by two time coincident femtosecond laser pulses.

Paper Details

Date Published: 16 June 2004
PDF: 11 pages
Proc. SPIE 5352, Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII, (16 June 2004); doi: 10.1117/12.530028
Show Author Affiliations
Sergey M. Avanesyan, Washington State Univ. (United States)
Stefano Orlando, IMIP/CNR (Italy)
Steve C. Langford, Washington State Univ. (United States)
J. Thomas Dickinson, Washington State Univ. (United States)

Published in SPIE Proceedings Vol. 5352:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials VIII
Kong-Thon Tsen; Jin-Joo Song; Hongxing Jiang, Editor(s)

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