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

 
: Sun, M.; Eppelt, U.; Schulz, W.; Zhu, J.

Shao, J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.; Shanghai Institute of Optics and Fine Mechanics -SIOM-, Shanghai:
Pacific Rim Laser Damage 2015. Proceedings : Optical Materials for High-Power Lasers. 17-20 May 2015, Jiading, Shanghai, China
Bellingham, WA: SPIE, 2015 (SPIE Proceedings 9532)
ISBN: 978-1-6284-1697-8
953214, 13 S.
Conference "Pacific Rim Laser Damage" <4, 2015, Shanghai>
Englisch
Konferenzbeitrag
Fraunhofer ILT ()

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.

: http://publica.fraunhofer.de/dokumente/N-360338.html