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
Femtosecond laser surface structuring technique for making human enamel and dentin surfaces superwetting
Anatoliy Y. Vorobyev,Chunlei Guo +1 more
TL;DR: In this paper, a femtosecond laser surface texturing approach was used to make both the enamel and dentine surfaces superwetting, which is a key factor in enhancing adhesion of restorative materials in dentistry.
Proceedings ArticleDOI
Femtosecond micro- and nano-machining of materials for microfluidic applications
TL;DR: In this paper, a femtosecond infrared laser ablation study of glass, PDMS, fused silica, and diamond films was performed using a 800 nm laser beam with a pulse width of 200 fs laser and repetition rates of up to 250 kHz.
Book ChapterDOI
Ultrashort Laser Pulses Applications
TL;DR: In this paper, the authors proposed the use of the Chirped Pulse Amplification (CPA) technique to generate ultrashort pulses with nanojoules of energy in a main oscillator laser, then temporally stretching these pulses by chirping its frequency (dispersion control) to decrease its power and intensity.
Journal ArticleDOI
Measuring the ablation threshold fluence in femtosecond laser micromachining with vortex and Bessel pulses
TL;DR: This work describes an approach for quantifying the ablation threshold fluence - the key parameter for comparing efficiency - suitable for weakly focused non-Gaussian beams, and demonstrates this method for Bessel and vortex beams, finding that theAblation threshold depends not just on the material, but the beam shape as well.
Journal ArticleDOI
Combined pulsed laser drilling of metal by continuous wave laser and nanosecond pulse train
TL;DR: In this article, a new form of combined pulsed laser (CPL) consisting of continuous wave (CW) laser and nanosecond (ns) pulse train was proposed for drilling Q235B steel without high-pressure gas jet.
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.