scholarly journals Numerical modeling of laser ablation of materials

2020 ◽  
Vol 28 (4) ◽  
pp. 398-405
Author(s):  
Ilkizar V. Amirkhanov ◽  
Nil R. Sarker ◽  
Ibrohim Sarkhadov
Keyword(s):  
Laser Ablation ◽  
Moving Boundary ◽  
Laser Action ◽  
Laser Pulses ◽  
Sample Surface ◽  
Ultrashort Laser Pulses ◽  
Laser Source ◽  
Maximum Temperature ◽  
Conductivity Equation ◽  
Thermal Conductivity Equation

In this paper, we report a numerical simulation of laser ablation of a material by ultrashort laser pulses. The thermal mechanism of laser ablation is described in terms of a one-dimensional nonstationary heat conduction equation in a coordinate system associated with a moving evaporation front. The laser action is taken into account through the functions of the source in the thermal conductivity equation that determine the coordinate and time dependence of the laser source. For a given dose of irradiation of the sample, the profiles of the sample temperature at different times, the dynamics of the displacement of the sample boundary due to evaporation, the velocity of this boundary, and the temperature of the sample at the moving boundary are obtained. The dependence of the maximum temperature on the sample surface and the thickness of the ablation layer on the radiation dose of the incident laser pulse is obtained. Numerical calculations were performed using the finite difference method. The obtained results agree with the results of other works obtained by their authors.

scholarly journals Pulses on Demand in Fibre and Hybrid Lasers

2019 ◽  
Vol 65 (11-12) ◽  
pp. 680-689
Author(s):  
Rok Petkovšek ◽  
Vid Agrež ◽  
Jaka Petelin ◽  
Luka Černe ◽  
Udo Bünting ◽  
...  
Keyword(s):  
Gain Control ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Laser Source ◽  
Single Shot ◽  
Transfer Printing ◽  
On Demand ◽  
Laser Transfer ◽  
Hybrid Lasers ◽  
Fibre Amplifier

This paper presents an investigation of pulse-on-demand operation in fibre and hybrid lasers. Two methods for efficient gain control that enable the generation of laser pulses at arbitrary times with controlled pulse parameters are presented. The method of direct modulation of the pump power in the high-power laser oscillator is shown to generate pulses with a duration in the nanosecond range, with repetition rates varying during operation from a single shot to over 1 MHz. An advanced method using a combination of marker and idler seeding a fibre amplifier chain is investigated. Such a system can easily achieve repetition rates of several tens of MHz. The lasers’ performances were successfully tested in a real environment on an industrial platform for laser transfer printing. Similar concepts were used for a laser source with ultrashort laser pulses (femtosecond range) on demand by using a mode-locked seed as a source and a solid-state amplifier to achieve high pulse energy and peak power.

Fractionation Effects in Laser Ablation Inductively Coupled Plasma Mass Spectrometry

1995 ◽  
Vol 49 (11) ◽  
pp. 1652-1660 ◽  
Author(s):  
Evan F. Cromwell ◽  
Peter Arrowsmith
Keyword(s):  
Mass Spectrometry ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Laser Pulses ◽  
Sample Surface ◽  
Sample Introduction ◽  
Matrix Analysis ◽  
Near Surface ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry

Aspects of laser ablation sample introduction for inductively coupled plasma mass spectrometry (ICPMS) have been investigated. For some analytes, nonrepresentative subsampling or fractionation is the major cause of poor analytical accuracy. Fractionation is prevalent for ablation at low laser fluence and with multiple laser pulses incident on the same area of the sample surface. The fluence dependence is explained by the relative depths of the melt- and heat-affected zones. Volatile analyte elements that are segregated in the bulk, or become segregated as the ablation zone is heated, are most prone to fractionation. For metal alloys, the extent of fractionation can be qualitatively predicted from the binary-phase diagram of the corresponding analyte matrix. Analysis by Auger electron spectroscopy showed that miscible elements may also be segregated at the near surface, with the extent of segregation growing with multiple laser pulses. Such segregation results in increased fractionation.

Laser ablation and structuring of transparent materials with ultrashort laser pulses

1998 ◽  
Author(s):  
David Ashkenasi ◽  
Gerril Herbst ◽  
Arkadi Rosenfeld ◽  
H. Varel ◽  
Michael Lorenz ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Transparent Materials ◽  
Ultrashort Laser

Laser ablation mechanism of transparent layers on semiconductors with ultrashort laser pulses

2011 ◽  
Author(s):  
Tino Rublack ◽  
Stefan Hartnauer ◽  
Michael Mergner ◽  
Markus Muchow ◽  
Gerhard Seifert
Keyword(s):  
Laser Ablation ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Ablation Mechanism ◽  
Ultrashort Laser

Single pulse femtosecond laser ablation of silicon – a comparison between experimental and simulated two-dimensional ablation profiles

2018 ◽  
Vol 7 (4) ◽  
pp. 255-264 ◽  
Author(s):  
Regina Moser ◽  
Matthias Domke ◽  
Jan Winter ◽  
Heinz P. Huber ◽  
Gerd Marowsky
Keyword(s):  
Laser Ablation ◽  
Near Infrared ◽  
Femtosecond Laser Ablation ◽  
Single Pulse ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Two Dimensional ◽  
Material Transport ◽  
Hydrodynamic Motion ◽  
Diode Pumped

Abstract Ultrashort laser pulses are widely used for the precise structuring of semiconductors like silicon (Si). We present here, for the first time, a comparative study of experimentally obtained and numerically simulated two-dimensional ablation profiles based on parameters of commercially relevant and widely used near-infrared and diode pumped femtosecond lasers. Single pulse laser ablation was studied at a center wavelength of 1040 nm and pulse duration of 380 fs (FWHM) in an irradiating fluence regime from 1 J/cm2 to 10 J/cm2. Process thresholds for material transport and removal were determined. Three regimes, scaling with the fluence, could be identified: low and middle fluence regimes and a hydrodynamic motion regime. By comparing the simulated and experimental ablation profiles, two conclusions can be drawn: At 2 J/cm2, the isothermal profile of 3800 K is in excellent agreement with the observed two-dimensional ablation. Thus exceeding a temperature of 3800 K can be accepted as a simplified ablation condition at that fluence. Furthermore, we observed a distinct deviation of the experimental from the simulated ablation profiles for irradiated fluences above 4 J/cm2. This points to hydrodynamic motion as an important contributing mechanism for laser ablation at higher fluences.

Synthesis of Highly Dispersed Spherical Metal Granules by Laser Ablation Method

2021 ◽  
Vol 316 ◽  
pp. 164-169
Author(s):  
Ruslan V. Chkalov ◽  
Dmitry A. Kochuev ◽  
Darya G. Vasilchenkova
Keyword(s):  
Laser Ablation ◽  
Prolonged Exposure ◽  
Reaction Medium ◽  
Laser Pulses ◽  
Ultrashort Laser Pulses ◽  
Atmospheric Environment ◽  
Powder Materials ◽  
Spherical Powder ◽  
Laser Ablation Method ◽  
Highly Dispersed

The work is devoted to the problem of synthesis of highly dispersed spherical powder granules by laser ablation. The formation of microspheres is carried out by the action of femtosecond laser radiation on the surface of a titanium target in a two-component reaction medium. The process of titanium treatment in n-hexane by ultrashort laser pulses is investigated. It is shown that the use of n-hexane as a working medium component allows the synthesis of micro-and nanopowders containing titanium carbide, which are resistant to atmospheric environment during prolonged exposure. The presented method provides the possibility of synthesis of high-purity powder materials with typical sizes from 1 to 3 microns.

The Selection and Characterization of the Absorptive Coatings Used to Laser Surface Treatments of Tool Steel Parts

2017 ◽  
Vol 1143 ◽  
pp. 167-173
Author(s):  
Petrică Alexandru ◽  
Simona Boiciuc
Keyword(s):  
Continuous Wave ◽  
Solid Phase ◽  
Laser Action ◽  
Graphite Powder ◽  
Absorption Capacity ◽  
Continuous Wave Laser ◽  
Conductivity Equation ◽  
Thermal Conductivity Equation ◽  
Surface Quenching

The paper presents the experimental results on the surface quenching by CO2 continuous wave laser action of solid phase steel with 1%C obtained, using different absorptive (ZnO, TiO2, ZrO2, graphite) powder coatings. The absorptivity of these coatings was determined by resolving the thermal conductivity equation for the irradiation with an energy punctual source on the massive body. Among the four investigated powders, for thermal treatment with laser of tools carbon steel it is recommend the powder of zinc oxide as coating with most efficient absorption capacity.

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