Temperature distribution and modification mechanism inside glass with heat accumulation during 250 kHz irradiation of femtosecond laser pulses

Sakakura, Masaaki; Shimizu, Masahiro; Shimotsuma, Yasuhiko; Miura, Kiyotaka; Hirao, Kazuyuki
December 2008
Applied Physics Letters;12/8/2008, Vol. 93 Issue 23, p231112
Academic Journal
Heat accumulation by high repetition rate femtosecond laser irradiation inside glass generates a much larger modification than that by a single pulse. In this study, we determined the temperature distribution due to heat accumulation and the characteristic temperature for heat modification inside a soda lime glass by analyzing the relationship between the radius of modification and glass temperature. The validity of the analysis was confirmed by reproducing the modification due to two-beam irradiation. The determined characteristic temperature suggested that the temperature distribution and the spatial dependence of the stress relaxation are important in the mechanism of heat modification.


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