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Ki, Hyungson
Laser Processing & Multiphysics Systems Laboratory
Research Interests
  • Laser materials processing
  • Laser material interaction

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Mass removal modes in the laser ablation of silicon by a Q-switched diode-pumped solid-state laser (DPSSL)

Cited 15 times inthomson ciCited 18 times inthomson ci
Title
Mass removal modes in the laser ablation of silicon by a Q-switched diode-pumped solid-state laser (DPSSL)
Author
Lim, DJKi, HyungsonMazumder, J
Keywords
SURFACE-TENSION; MOLTEN SILICON; SEMICONDUCTORS; TEMPERATURE; PICOSECOND; DENSITY; PULSES
Issue Date
2006-06
Publisher
IOP PUBLISHING LTD
Citation
JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.39, no.12, pp.2624 - 2635
Abstract
A fundamental study on the Q-switched diode-pumped solid-state laser interaction with silicon was performed both experimentally and numerically. Single pulse drilling experiments were conducted on N-type silicon wafers by varying the laser intensity from 10(8)-10(9)W cm(-2) to investigate how the mass removal mechanism changes depending on the laser intensity. Hole width and depth were measured and surface morphology was studied using scanning electron microscopy. For the numerical model study, Ki et al's self-consistent continuous-wave laser drilling model (2001 J. Phys. D: Appl. Phys. 34 364-72) was modified to treat the solidification phenomenon between successive laser pulses. The model has the capabilities of simulating major interaction physics, such as melt flow, heat transfer, evaporation, homogeneous boiling, multiple reflections and surface evolution. This study presents some interesting results on how the mass removal mode changes as the laser intensity increases.
URI
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DOI
10.1088/0022-3727/39/12/023
ISSN
0022-3727
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