Analytical model of time-dependent photoionization and nonlinear absorption of few-cycle laser pulses in dielectrics

2021 ◽  
Author(s):  
Vitaly E. Gruzdev ◽  
Olga Sergaeva
Keyword(s):  
Analytical Model ◽  
Nonlinear Absorption ◽  
Laser Pulses ◽  
Time Dependent

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.

Nonlinear absorption of femtosecond laser pulses (800 nm) by atmospheric air and water vapour

2011 ◽  
Vol 41 (11) ◽  
pp. 976-979 ◽  
Author(s):  
A M Kiselev ◽  
Yu N Ponomarev ◽  
A N Stepanov ◽  
A B Tikhomirov ◽  
B A Tikhomirov
Keyword(s):  
Femtosecond Laser ◽  
Water Vapour ◽  
Nonlinear Absorption ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Atmospheric Air

scholarly journals Unsteady deformations of a free liquid surface caused by radiation pressure

2011 ◽  
Vol 682 ◽  
pp. 460-490 ◽  
Author(s):  
B. ISSENMANN ◽  
R. WUNENBURGER ◽  
H. CHRAIBI ◽  
M. GANDIL ◽  
J.-P. DELVILLE
Keyword(s):  
Analytical Model ◽  
Radiation Pressure ◽  
Liquid Surface ◽  
Acoustic Pulse ◽  
Free Liquid Surface ◽  
Time Dependent ◽  
Surface Dynamics ◽  
Fluid Interface ◽  
Numerical Predictions ◽  
Strongly Damped

We present an analytical model of the time-dependent, small-amplitude deformation of a free liquid surface caused by a spatially localized, axisymmetric, pulsed or continuous, acoustic or electromagnetic radiation pressure exerted on the surface. By exactly solving the unsteady Stokes equation, we predict the surface dynamics in all dynamic regimes, namely inertial, intermediate and strongly damped regimes. We demonstrate the validity of this model in all dynamic regimes by comparing its prediction to experiments consisting of optically measuring the time-dependent curvature of the tip of a hump created at a liquid surface by the radiation pressure of an acoustic pulse. Finally, we present a numerical scheme simulating the behaviour of a fluid–fluid interface subjected to a time-dependent radiation pressure and show its accuracy by comparing the numerical predictions with the analytical model in the intermediate and strongly damped regimes.

Ion acceleration by multiple laser pulses and their spontaneous electromagnetic fields in plasma

2008 ◽  
Vol 74 (1) ◽  
pp. 111-118
Author(s):  
FEN-CE CHEN
Keyword(s):  
Magnetic Fields ◽  
Electric Field ◽  
Analytical Model ◽  
Electromagnetic Fields ◽  
Equations Of Motion ◽  
Charged Particles ◽  
Laser Pulses ◽  
The Self ◽  
Electric And Magnetic Fields ◽  
Relativistic Equations

AbstractThe acceleration of ions by multiple laser pulses and their spontaneously generated electric and magnetic fields is investigated by using an analytical model for the latter. The relativistic equations of motion of test charged particles are solved numerically. It is found that the self-generated axial electric field plays an important role in the acceleration, and the energy of heavy test ions can reach several gigaelectronvolts.

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