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Proceedings Paper

Laser-induced breakdown mechanisms of a glass microsphere
Author(s): Jaemyoung Lee
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Paper Abstract

Laser energy distributions of 20 μm and 40 μm glass microspheres were calculated with different laser wavelengths. Most simulation results show similar energy distributions in which laser energies are focused at the backside of the microsphere. Using time-resolved optical shadow images and Schlieren images, initial breakdown location and shockwave propagation from the breakdown were investigated for 20 μm glass microsphere which was ablated by Nd:YAG laser with a wavelength of 1.064 μm. Time-resolved imaging showed the location of the initial breakdown and the shockwave motion over its first 300 μm of expansion. Measured shockwave velocities were in the range of 1-10 km/s and showed a linear dependence on laser fluence within 30 ns.

Paper Details

Date Published: 13 January 2005
PDF: 7 pages
Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); doi: 10.1117/12.575971
Show Author Affiliations
Jaemyoung Lee, Korea Polytechnic Univ. (South Korea)

Published in SPIE Proceedings Vol. 5629:
Lasers in Material Processing and Manufacturing II
ShuShen Deng; Akira Matsunawa; Y. Lawrence Yao; Minlin Zhong, Editor(s)

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