PUBLICATION IN ULTRAFAST LASER
Achievements in Ultrashort Laser Matter Interaction
waveguide on fused silica
(100mm below the surface)
Fig. B: micro hole (50:1 with 20mm
thin film scribing on a solar cell panel
Research on Ultrashort Laser-Material Interaction
The goal of this project area is to establish a scientific
understanding of ultrashort laser-matter interaction and develop novel
applications using ultrashort pulsed lasers. Specific objectives of the research include:
- Establishing predictive models for ultrashort laser-matter
interaction based on:
- atomistic modeling
- hydrodynamic modeling
- two-temperature models
- multi-scale, multi-physics modeling
- Studying the plasma dynamics and evolution during ultrashort
laser material interaction
- Developing experimental measurement capabilities of plasma
- Develop novel micro/nano fabrication capabilities using ultrashort
- fabrication of waveguides and micro-channels on fused silica
- micro machining capabilities including high aspect hole drilling
- micro machining of soft transparent biomaterials
- fabrication of micro/nano devices using two photon polymerization
- solar cell thin film scribing
- creation of nano-size surface textures for solar cells and
hydrophobic surfaces for applications to microfluidic devices and
micro heat exchangers
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The study is based on the simultaneous
experimental and numerical investigations of of ultrashort laser
material interaction. The experimental
are being carried out using a Spectra Physics femtosecond laser (Spectra
Physics, Spitfire Pro: 1mJ, 800nm, 1 kHz, 100 fs) and a Lumera
picosecond laser (2W, 500kHz, 10 ps, 532 nm, 1064 nm).
Various beam delivery mechanisms and diagnostics instruments are used
with these set-ups. Modeling
efforts include an atomistic modeling approach based on molecular
dynamics-Monte Carlo method, multi-physics hydrodynamic models for
prediction of material ablation and plasma evolution, and
two-temperature models to predict ablation depth. These models are
supplemented by the in-house developed Quotidian Equations of State (QEOS)
for calculation of requisite properties. At the same time, various
novel applications utilizing ultrafast lasers are being explored.
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- Successful modeling of ablation depth using a two-temperature
model for various materials including metals, semi-conductors and
- Development of a molecular dynamics (MD) + Monte Carlo (MC) simulation
model for energy transport during the ultrashort metal interaction
- Early plasma dynamics prediction using an extended MD technique.
- Development of a comprehensive 2D hydrodynamic model for
ultrashort laser matter interaction.
- Measurement of plasma evolution during the femtosecond laser
ablation using fluorescence spectroscopy and shadowgraph techniques
- Successful high aspect ratio micro hole drilling (50:1) (Fig. B).
- Fabrication of waveguides and micro channels on SiO2
using the femtosecond laser (Fig. A).
- Microchannel formation on soft gel bio materials.
- Fabrication of nanostructures such as photonic crystals by 2PP
(see Fig. 3 and 4).
- High speed pricise microchannel scribing (Fig. C).
- Creation of nano-sized laser-induced periodic surface structures
for absorption improvement of light energy for silicon and thin film
% All the figures may be copyrighted. Use of these figures
require written permission.
Fig. 1: Measured plasma
evolution during femtosecond laser ablation with ps resolution
using a pump-probe beam method
Fig. 2: MD-MC simulation of laser ablation
Fig. 3: Photonic crystal structure
with submicron resolution made by TPP
shape with 10x10x20
envelop by two photon polymerization
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A femtosecond laser set-up
Picosecond laser set-up
Air Force, Navy
Indiana 21st Century Research and Technology
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Copyright © 2001 Dr. Y.C. Shin
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