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Meeting MS&T22: Materials Science & Technology
Symposium Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
Presentation Title K-19: Effect of Plasma Shielding in Laser Irradiation of Metal Targets with Bursts of Ultrashort Pulses
Author(s) Michael Stokes, Zhibin Lin, Alexey N Volkov
On-Site Speaker (Planned) Michael Stokes
Abstract Scope Pulsed laser ablation has applications for microscale material processing including material removal. The absorption of incident laser radiation in the expanding plume of ablation products results in the partial shielding of the target reducing efficiency of the material processing. In the present work, the shielding effect for a burst of ultrashort laser pulses is predicted using a computational model that combines a non-equilibrium collision-radiation model for the plasma plume with the two-temperature model of laser heating that accounts for finite time of electron and lattice coupling in the target material. The model accounts for absorption of laser radiation through multiphoton ionization and inverse bremsstrahlung as well as ionization and recombination processes. Simulations performed for single, double, and triple ultrashort laser pulses with a duration of 400 fs – 100 ps and repetition rates on the GHz scale indicate that the degree of plasma shielding strongly depends on the inter-pulse separation. This work was supported by the MKS Instruments, Inc. and NSF through EPSCoR CPU2AL project (award 1655280). The computational support is provided by the Alabama Supercomputer Center.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Carbon-Carbon Composite Materials from 3D Printed Preforms Graphitized by Electric Field Assisted Sintering
Consolidating Tungsten in 2s at a Furnace Temperature of 900 oC using Flash Sintering Approach
Graphene Infused High Conductivity Copper
In-situ Diffraction of Ultrasonically-modified Phase Evolution in a Ternary Al-Si-Mg Alloy
K-19: Effect of Plasma Shielding in Laser Irradiation of Metal Targets with Bursts of Ultrashort Pulses
Mechanochemistry: From Scientific Mystery to Scalable Materials Preparation and Recycling Technique
Microwave Sintering of Bioinspired Porous Alumina Foams
Post-processing of Additively Manufactured 316 Stainless Steel by Electron Wind Force
Spatially Tuned Properties of Soft Magnetic Alloys by Transverse Induction Annealing
The Coupled Effect of Temperature and Electric Field on Diffusion Welding of Alloy 617 via Electric Field Assisted Sintering
Touch Free Flash Sintering of Ceramics
Using Organic Acids to Densify Ceramics

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