Laser-induced breakdown mechanisms of a glass microsphere

Jaemyoung Lee

doi:10.1117/12.575971

13 January 2005 Laser-induced breakdown mechanisms of a glass microsphere

Jaemyoung Lee

Proceedings Volume 5629, Lasers in Material Processing and Manufacturing II; (2005) https://doi.org/10.1117/12.575971
Event: Photonics Asia, 2004, Beijing, China

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.

Citation Download Citation

Jaemyoung Lee "Laser-induced breakdown mechanisms of a glass microsphere", Proc. SPIE 5629, Lasers in Material Processing and Manufacturing II, (13 January 2005); https://doi.org/10.1117/12.575971

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