scholarly journals On the importance of initial conditions for excited-state dynamics

2018 ◽  
Vol 212 ◽  
pp. 307-330 ◽  
Author(s):  
Jiří Suchan ◽  
Daniel Hollas ◽  
Basile F. E. Curchod ◽  
Petr Slavíček
Keyword(s):  
Excited State ◽  
Initial Conditions ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Electronic Structure Theory ◽  
Structure Theory ◽  
Classical Trajectories ◽  
Ultrashort Laser ◽  
Selection Of ◽  
Continuum Wave

The vast majority of ab initio excited-state simulations are performed within semiclassical, trajectory-based approaches. Apart from the underlying electronic-structure theory, the reliability of the simulations is controlled by a selection of initial conditions for the classical trajectories. We discuss appropriate choices of initial conditions for simulations of different experimental arrangements: dynamics initiated by continuum-wave (CW) laser fields or triggered by ultrashort laser pulses.

scholarly journals Rod–sphere cluster irradiation with femtosecond laser pulses: cut and paste at the nanoscale

Nanophotonics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 3153-3159 ◽  
Author(s):  
Pablo Díaz-Núñez ◽  
Sabrina L. J. Thomä ◽  
Guillermo González-Rubio ◽  
Olivia Borrell-Grueiro ◽  
Roland P. M. Höller ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Surface Enhanced ◽  
Fine Control ◽  
Degree Of Control ◽  
The Individual ◽  
Ultrashort Laser ◽  
Individual Particles ◽  
Selection Of

Abstract We report on the irradiation of gold rod–sphere assemblies with ultrashort laser pulses, producing structures that are very difficult to obtain by other methods. The optical response of these assemblies displays several peaks arising from the interaction of the plasmon modes of the individual particles, offering thus great flexibility to control the energy deposited on the individual particles. Judicious selection of the wavelength and fluence of the laser pulses allow fine control over the changes produced: the particles can be melted, welded and/or the organic links cleaved. In this way, it is possible to generate structures “à la carte” with a degree of control unmatched by other synthetic protocols. The method is exemplified with gold nanoparticles, but it can be easily implemented on particles composed of different metals, widening considerably the range of possibilities. The final structures are excellent candidates for surface-enhanced spectroscopies or plasmonic photothermal therapy as they have a very intense electric field located outside the structure, not in the gaps.

scholarly journals Excited-state dynamics of m-dichlorobezene in ultrashort laser pulses

2017 ◽  
Vol 66 (15) ◽  
pp. 157801
Author(s):  
Shen Huan ◽  
Hu Chun-Long ◽  
Deng Xu-Lan
Keyword(s):  
Excited State ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Excited State Dynamics ◽  
Ultrashort Laser

scholarly journals Plasma Mirrors for Cleaning Laser Pulses from the Infrared to the Ultraviolet

2018 ◽  
Vol 167 ◽  
pp. 04001 ◽  
Author(s):  
István B Földes ◽  
Barnabás Gilicze ◽  
Zsolt Kovács ◽  
Sándor Szatmári
Keyword(s):  
High Efficiency ◽  
Initial Conditions ◽  
Laser System ◽  
Critical Density ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Solid Surfaces ◽  
Krf Laser ◽  
Laser Systems ◽  
Ultrashort Laser

Ultrashort laser pulses are generally preceded by prepulses which - in case of high main pulse intensities - may generate preplasmas on solid surfaces, thus making the initial conditions for the interactions ambiguous. Infrared laser systems applied successfully, with high efficiency self-induced plasma mirrors for improving the contrast of the beam. Short wavelength laser beams however have a larger critical density in the plasma, and due to their deeper penetration the absorption is higher, the reflectivity, and the corresponding plasma mirror efficiency is lower. We show herewith that with carefully planned boundary conditions plasma mirrors can reach up to 70% efficiency even for KrF laser radiation. Our observations can be qualitatively explained by the classical Drude model. The high reflectivity allows the use of plasma mirrors even after the final amplification or before the last amplifier. Different arrangement proposals for its integration to our high power KrF laser system are given as well.

Welding characteristics of foturan glass using ultrashort laser pulses

2012 ◽  
Author(s):  
Isamu Miyamoto ◽  
Kristian Cvecek ◽  
Yasuhiro Okamoto ◽  
Michael Schmidt ◽  
Henry Helvajian
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Ultrashort Laser

Evaluation of Chip-Breakers Manufactured by Ultrashort Laser Pulses in Cemented Carbide Tools

2017 ◽  
Author(s):  
Marcelo Bertolete Carneiro ◽  
Patrícia Alves Barbosa ◽  
Ricardo Samad ◽  
NIlson Vieira ◽  
Wagner de Rossi ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Cemented Carbide ◽  
Cemented Carbide Tools ◽  
Ultrashort Laser

Picosecond Single-Photon and Femtosecond Two-Photon Pulsed Laser Stimulation for IC Characterization and Failure Analysis

2009 ◽  
Author(s):  
V. Pouget ◽  
E. Faraud ◽  
K. Shao ◽  
S. Jonathas ◽  
D. Horain ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Single Photon ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Laser Stimulation ◽  
Two Photon ◽  
Resolution Improvement ◽  
Ultrashort Laser

Abstract This paper presents the use of pulsed laser stimulation with picosecond and femtosecond laser pulses. We first discuss the resolution improvement that can be expected when using ultrashort laser pulses. Two case studies are then presented to illustrate the possibilities of the pulsed laser photoelectric stimulation in picosecond single-photon and femtosecond two-photon modes.

scholarly journals Super-Heavy Ions Acceleration Driven by Ultrashort Laser Pulses at Ultrahigh Intensity

2021 ◽  
Vol 11 (2) ◽  
Author(s):  
Pengjie Wang ◽  
Zheng Gong ◽  
Seong Geun Lee ◽  
Yinren Shou ◽  
Yixing Geng ◽  
...  
Keyword(s):  
Heavy Ions ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Ultrashort Laser

scholarly journals Analytical model for the depth progress of percussion drilling with ultrashort laser pulses

2021 ◽  
Vol 127 (5) ◽  
Author(s):  
Daniel Holder ◽  
Rudolf Weber ◽  
Thomas Graf ◽  
Volkher Onuseit ◽  
David Brinkmeier ◽  
...  
Keyword(s):  
Analytical Model ◽  
Experimental Validation ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Picosecond Pulses ◽  
Hole Depth ◽  
Laser Percussion Drilling ◽  
Pulse Energies ◽  
Ultrashort Laser ◽  
Percussion Drilling

AbstractA simplified analytical model is presented that predicts the depth progress during and the final hole depth obtained by laser percussion drilling in metals with ultrashort laser pulses. The model is based on the assumption that drilled microholes exhibit a conical shape and that the absorbed fluence linearly increases with the depth of the hole. The depth progress is calculated recursively based on the depth changes induced by the successive pulses. The experimental validation confirms the model and its assumptions for percussion drilling in stainless steel with picosecond pulses and different pulse energies.

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