Journal ArticleDOI
Ablation of metals by ultrashort laser pulses
Stefan Nolte,Carsten Momma,H. Jacobs,Andreas Tünnermann,Boris N. Chichkov,B. Wellegehausen,Herbert Welling +6 more
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In this paper, the authors studied the ablation of metal targets by Ti:sapphire laser radiation and showed that the intensity depends logarithmically on the laser fluence.Abstract:
Ablation of metal targets by Ti:sapphire laser radiation is studied. The ablation depth per pulse is measured for laser pulse durations between 150 fs and 30 ps and fluences ranging from the ablation threshold ∼0.1 J/cm2 up to 10 J/cm2. Two different ablation regimes are observed for the first time. In both cases the ablation depth per pulse depends logarithmically on the laser fluence. A simple theoretical model for a qualitative description of the experimental results is presented.read more
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Recent developments in compact ultrafast lasers
TL;DR: Semiconductor lasers for optical pumping and fast optical saturable absorbers, based on either semiconductor devices or the optical nonlinear Kerr effect, have dramatically improved these lasers and opened up new frontiers for applications with extremely short temporal resolution, extremely high peak optical intensities and extremely fast pulse repetition rates.
Journal ArticleDOI
Mechanisms of femtosecond laser nanosurgery of cells and tissues
TL;DR: In this article, the working mechanisms of femtosecond laser nanoprocessing in biomaterials with oscillator pulses of 80-MHz repetition rate and with amplified pulses of 1-kHz repetition rate were investigated.
Journal ArticleDOI
Q-switching stability limits of continuous-wave passive mode locking
TL;DR: In this paper, the transition between the regimes of cw mode locking and Q-switched mode locking was investigated, and an extended theory that took into account nonlinear soliton-shaping effects and gain filtering was developed.
Journal ArticleDOI
Laser-Induced Shape Changes of Colloidal Gold Nanorods Using Femtosecond and Nanosecond Laser Pulses
TL;DR: In this article, the shape transformations of gold nanorods were investigated by using visible absorption spectroscopy and transmission electron microscopy (TEM) in order to analyze the final shape and size distribution.
Journal ArticleDOI
The effect of damage accumulation behaviour on ablation thresholds and damage morphology in ultrafast laser micro-machining of common metals in air
TL;DR: In this paper, the ablation threshold fluence depends on the number of pulses applied to the same spot, and the strength of this dependence is governed by the incubation coefficient, S, which has been determined along with the single-shot threshold, φ th (1), for all the metals studied.
References
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Journal ArticleDOI
Compression of amplified chirped optical pulses
Donna Strickland,Gerard Mourou +1 more
TL;DR: In this paper, the amplification and subsequent recompression of optical chirped pulses were demonstrated using a system which produces 1.06 μm laser pulses with pulse widths of 2 ps and energies at the millijoule level.
Journal ArticleDOI
Femtosecond, picosecond and nanosecond laser ablation of solids
TL;DR: Theoretical models and qualitative explanations of experimental results are presented in this paper for femtosecond laser ablation of solid targets by 0.2-5000 ps Ti: Sapphire laser pulses.
Journal ArticleDOI
Laser‐induced breakdown by impact ionization in SiO2 with pulse widths from 7 ns to 150 fs
TL;DR: In this article, the results of laser-induced breakdown experiments in fused silica (SiO2) employing 150 fs −7 ns, 780 nm laser pulses are reported and the avalanche ionization mechanism is found to dominate over the entire pulse width range.
Journal ArticleDOI
An electron conductivity model for dense plasmas
Y. T. Lee,R. M. More +1 more
TL;DR: An electron conductivity model for dense plasmas is described in this article, which gives a consistent and complete set of transport coefficients including not only electrical conductivity and thermal conductivity, but also thermoelectric power, and Hall, Nernst, Ettinghausen, and Leduc-Righi coefficients.
Journal ArticleDOI
Time-resolved observation of electron-phonon relaxation in copper.
TL;DR: In this paper, the process of electron-phonon energy transfer was time resolved and was observed to be 1--4 ps increasing with the laser fluence, and non-equilibrium electron-lattice temperatures were observed.