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
Modeling of femtosecond laser-induced non-equilibrium deformation in metal films
TL;DR: In this article, a new set of fully coupled, transient thermoelasticity equations is derived based on the assumption of uniaxial strain but three-dimensional stress, and two potential material removal mechanisms, thermal (melting) and non-thermal (high stress), are identified.
Journal ArticleDOI
Energy transport and material removal in wide bandgap materials by a femtosecond laser pulse
Lan Jiang,Hai-Lung Tsai +1 more
TL;DR: In this article, a new model is proposed which greatly improves the accuracy in predicting the ablation depth and, for the first time, can predict the flat bottom crater shape for wide bandgap materials ablated by a femtosecond laser pulse.
Journal ArticleDOI
Hydrodynamics of particle formation following femtosecond laser ablation
TL;DR: In this article, the authors model particle formation by considering the hydrodynamics of material expansion into vacuum, and find that the ejected material can be quenched 1-3 orders of magnitude more efficiently than thermal conduction quenches the residual bulk surface.
Journal ArticleDOI
Surface treatment of CFRP composites using femtosecond laser radiation
Vitor Oliveira,Vitor Oliveira,S. P. Sharma,S. P. Sharma,M.F.S.F. de Moura,R.D.F. Moreira,Rui Vilar,Rui Vilar +7 more
TL;DR: In this article, the surface treatment of carbon fiber-reinforced polymer (CFRP) composites by laser ablation with femtosecond laser radiation was investigated, and the morphology of the laser treated surfaces was investigated by field emission scanning electron microscopy.
Femtosecond laser micromachining: Current status and applications
TL;DR: In this paper, the status of micromachining with femtosecond pulses is reviewed for a variety of materials and a comparison made with other solid-state lasers, and an outlook for developments in this area is presented.
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.