Collection Of theses on high power laser and plasma physics, 2015, 13 (1): 953214, Published Online: May. 27, 2017  

Mechanism of internal modification in bulk borosilicate glass with picosecond laser pulses at high repetition rates

Author Affiliations
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Qinghe Road 390, Jiading District, Shanghai 201800, China
2 Fraunhofer-Institut für Lasertechnik, Steinbachstr. 15, 52074 Aachen, Germany
3 Nonlinear Dynamics of Laser Processing, RWTH Aachen University, Steinbachstr. 15, 52074 Aachen, Germany
Abstract
We present a numerical model of internal modification in bulk borosilicate glass by high repetition rate picosecond laser pulses. We study free-electron dynamics, nonlinear energy deposition and thermal conduction. The optical absorptivity and modification regions both have good agreements with the experimental results. The smooth outer zone is the molten region and the inner-structure formation is caused by high-density free-electrons generated by thermal ionization. Excitation, relaxation and accumulation of free-electron density in the focal volume are analyzed using different pulse shapes and a double-pulse train. The deposited energy distribution and modification zone are controlled by pulse shaping.

Mingying Sun, Urs Eppelt, Wolfgang Schulz, Jianqiang Zhu. Mechanism of internal modification in bulk borosilicate glass with picosecond laser pulses at high repetition rates[J]. Collection Of theses on high power laser and plasma physics, 2015, 13(1): 953214.

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