Journal ArticleDOI
Ultrashort-pulse laser machining of dielectric materials
Michael D. Perry,Brent C. Stuart,P.S. Banks,Michael D. Feit,Victor Yanovsky,Alexander M. Rubenchik +5 more
TLDR
In this article, the authors show that high precision machining of all dielectrics (oxides, fluorides, explosives, teeth, glasses, ceramics, SiC, etc.) with no thermal shock or distortion of the remaining material by this mechanism is described.Abstract:
There is a strong deviation from the usual τ1/2 scaling of laser damage fluence for pulses below 10 ps in dielectric materials. This behavior is a result of the transition from a thermally dominated damage mechanism to one dominated by plasma formation on a time scale too short for significant energy transfer to the lattice. This new mechanism of damage (material removal) is accompanied by a qualitative change in the morphology of the interaction site and essentially no collateral damage. High precision machining of all dielectrics (oxides, fluorides, explosives, teeth, glasses, ceramics, SiC, etc.) with no thermal shock or distortion of the remaining material by this mechanism is described.read more
Citations
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Journal ArticleDOI
Use of Femtosecond Laser Technique for Studying Physically Small Cracks
Yasuko Motoyashiki,Angelika Brückner-Foit,Lars Englert,L. Haag,Matthias Wollenhaupt,Thomas Baumert +5 more
TL;DR: In this article, small artificial notches with a length in the submillimeter range were manufactured in medium carbon steels with this technique and some fatigue tests were carried out Laser affected zones could be observed at the notch boundary but cracks were initiated from the notch tips and propagated steadily.
Combined Infrared Thermal Imaging and Laser Heating for the Study of Materials Thermophysical and Processing Properties at High Temperatures
TL;DR: In this article, the authors discuss suitable heat transport models for analysis of thermal data and, finally, describe examples of thermophysical material parameters derived from combined infrared imaging and laser heating, and illustrate general principles of this combined laser-based heating and IR thermal imaging approach that are useful for experimentation under extreme conditions.
Journal ArticleDOI
Femtosecond laser nanoablation of glass in the near-field of single wall carbon nanotube bundles
Samuel X. Guo,Adela Ben-Yakar +1 more
TL;DR: In this paper, the femtosecond (fs) laser ablation of bundles of single wall carbon nanotubes (SWCNTs) deposited on glass and the resulting nanoablation of glass beneath the bundles were investigated.
Proceedings ArticleDOI
Development of a laser-based process chain for manufacturing free form optics
TL;DR: In this article, the current state of the development of a laser-based process chain for manufacturing fused silica optics is presented, in which the first step is ablated with laser radiation to produce the geometry of the optics and a subsequent polishing step reduces the surface roughness and a third step uses micro ablation to remove the last remaining redundant material.
Journal ArticleDOI
Simulation of femtosecond laser ablation sapphire based on free electron density
Maolu Wang,Wei Mei,Yang Wang +2 more
TL;DR: In this paper, the authors investigated the temporal and spatial evolution law of free electron density induced by femtosecond laser pulse and its influence on absorption coefficient, reflectivity and ablation depth.
References
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Tunnel ionization of complex atoms and of atomic ions in an altemating electromagnetic field
TL;DR: In this article, an expression for the probability of tunnel ionization in an alternating field, of a complex atom and of an atomic ion that are in an arbitrary state, was derived in the quasiclassical approximation n* $1.
Journal ArticleDOI
Nanosecond-to-femtosecond laser-induced breakdown in dielectrics
Brent C. Stuart,Michael D. Feit,S. Herman,Alexander M. Rubenchik,Bruce W. Shore,Michael D. Perry +5 more
TL;DR: A decreasing threshold fluence is found associated with a gradual transition from the long-pulse, thermally dominated regime to an ablative regime dominated by collisional and multiphoton ionization, and plasma formation.
Book
Quantum Processes in Semiconductors
TL;DR: In this paper, the energy and momentum conservation of phonon-impurity coupling in the diamond lattice is discussed. But the authors do not consider the effect of photo-ionization on photo-deionization of a hydrogenic acceptor.