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

Mingying Sun; Urs Eppelt; Wolfgang Schulz; Jianqiang Zhu

doi:10.1117/12.2185518

14 July 2015 Mechanism of internal modification in bulk borosilicate glass with picosecond laser pulses at high repetition rates

Mingying Sun, Urs Eppelt, Wolfgang Schulz, Jianqiang Zhu

Author Affiliations +

Proceedings Volume 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers; 953214 (2015) https://doi.org/10.1117/12.2185518
Event: Pacific Rim Laser Damage, 2015, Jiading, Shanghai, China

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.

Citation Download Citation

Mingying Sun, Urs Eppelt, Wolfgang Schulz, and Jianqiang Zhu "Mechanism of internal modification in bulk borosilicate glass with picosecond laser pulses at high repetition rates", Proc. SPIE 9532, Pacific Rim Laser Damage 2015: Optical Materials for High-Power Lasers, 953214 (14 July 2015); https://doi.org/10.1117/12.2185518

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