This article investigates numerically the electronic transport characteristics in fused silica (SiO2) irradiated by ultra-short pulsed lasers. The non-local type of Fokker-Planck equation which accounts for avalanche ionization, three-body recombination, and multiphoton ionization is used to describe the ultra-short pulsed laser-induced damage phenomena in the energy-position space. It is observed that the recombination plays an important role in determining the ablation depth, and also contributes to reduce substantially the rate of increase in electron number density when the electron density exceeds a certain threshold. With very intense laser irradiation, a strong absorption of laser energy takes place and an initially transparent solid is converted to a metallic state. Full ionization is achieved at intensities above threshold and all further laser energy is deposited within a thin skin depth. The absorption length is on the order of a wavelength at very high laser fluence, and it becomes thinner as laser fluence is larger. It is because the absorbed energy is no longer consumed for multiphoton ionization, but rather leads to the drastic increase in the absorption coefficient because of the Joule heating.
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ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems
July 17–22, 2005
San Francisco, California, USA
Conference Sponsors:
- Heat Transfer Division and Electronic and Photonic Packaging Division
ISBN:
0-7918-4733-0
PROCEEDINGS PAPER
Fokker-Planck Approach to Photon-Electron Interactions in Dielectrics During Ultrafast-Pulse Laser Ablation Available to Purchase
Seong Hyuk Lee,
Seong Hyuk Lee
Chung-Ang University, Seoul, Korea
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Kwan Gu Kang,
Kwan Gu Kang
Chung-Ang University, Seoul, Korea
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Joon Sik Lee,
Joon Sik Lee
Seoul National University, Seoul, Korea
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Young Ki Choi,
Young Ki Choi
Chung-Ang University, Seoul, Korea
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Seungho Park
Seungho Park
Hongik University, Seoul, Korea
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Seong Hyuk Lee
Chung-Ang University, Seoul, Korea
Kwan Gu Kang
Chung-Ang University, Seoul, Korea
Joon Sik Lee
Seoul National University, Seoul, Korea
Young Ki Choi
Chung-Ang University, Seoul, Korea
Seungho Park
Hongik University, Seoul, Korea
Paper No:
HT2005-72449, pp. 303-309; 7 pages
Published Online:
March 9, 2009
Citation
Lee, SH, Kang, KG, Lee, JS, Choi, YK, & Park, S. "Fokker-Planck Approach to Photon-Electron Interactions in Dielectrics During Ultrafast-Pulse Laser Ablation." Proceedings of the ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. Heat Transfer: Volume 3. San Francisco, California, USA. July 17–22, 2005. pp. 303-309. ASME. https://doi.org/10.1115/HT2005-72449
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