Journal
OPTICS LETTERS
Volume 26, Issue 1, Pages 19-21Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.26.000019
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We investigated the relationship between the formation of filaments and local refractive-index changes induced by femtosecond laser pulses in silica glass. In situ observation revealed that the location of a filament coincided with that of the refractive-index change. Observation also showed that the region of refractive-index change was elongated toward the upstream direction of the laser pulses with increasing exposure time. The region of refractive-index change was several hundred micrometers long, and its diameter was smaller than 2 mum. The refractive-index change was confirmed by two of three different methods to be as large as 0.8 x (C) 2001 Optical Society of America OCIS codes: 130.2790, 190.7110, 190.3270, 230.7370, 320.7110, 160.2750.
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