Laser material interaction technologies for materials processing

1998 ◽  
Author(s):  
Yash P. Kathuria
Keyword(s):  
Materials Processing ◽  
Laser Material ◽  
Material Interaction

scholarly journals Simulation of the laser-material interaction of ultrashort pulse laser processing of silicon nitride workpieces and the key factors in the ablation process

2021 ◽  
Author(s):  
Babak Soltani ◽  
Faramarz Hojati ◽  
Amir Daneshi ◽  
Bahman Azarhoushang
Keyword(s):  
Mathematical Model ◽  
Laser Ablation ◽  
Pulse Laser ◽  
Ultrashort Pulse ◽  
Laser Processing ◽  
Laser Power ◽  
Removal Rate ◽  
Ultrashort Pulse Laser ◽  
Laser Material ◽  
Material Interaction

AbstractUnderstanding the laser ablation mechanism is highly essential to find the effect of different laser parameters on the quality of the laser ablation. A mathematical model was developed in the current investigation to calculate the material removal rate and ablation depth. Laser cuts were created on the workpiece with different laser scan speeds from 1 to 10 mm s−1 by an ultrashort pulse laser with a wavelength of about 1000 nm. The calculated depths of laser cuts were validated via practical experiments. The variation of the laser power intensity on the workpiece’s surface during laser radiation was also calculated. The mathematical model has determined the laser-material interaction mechanism for different laser intensities. The practical sublimation temperature and ablated material temperature during laser processing are other data that the model calculates. The results show that in laser power intensities (IL) higher than 1.5 × 109 W cm−2, the laser-material interaction is multiphoton ionisation with no effects of thermal reaction, while in lower values of IL, there are effects of thermal damages and HAZ adjacent to the laser cut. The angle of incidence is an essential factor in altering incident IL on the surface of the workpiece during laser processing, which changes with increasing depth of the laser cut.

Negative ions generated by laser‐material interaction (invited)

1992 ◽  
Vol 63 (4) ◽  
pp. 2672-2675 ◽  
Author(s):  
G. Korschinek ◽  
T. Henkelmann
Keyword(s):  
Negative Ions ◽  
Laser Material ◽  
Material Interaction

Characteristics of Nanopatterns and the Associated Thermal Mechanisms During Near Field Laser-Material Interaction of Nanosecond Laser on Different Targets

2009 ◽  
Author(s):  
Vijay M. Sundaram ◽  
Sy-Bor Wen
Keyword(s):  
Near Field ◽  
Target Material ◽  
Optical Microscope ◽  
Laser Source ◽  
Nanosecond Laser ◽  
Metallic Surfaces ◽  
Experimental Conditions ◽  
Laser Material ◽  
Material Conditions ◽  
Material Interaction

Nano-patterns are generated on semiconducting and metallic surfaces through coupling an apertured near field scanning optical microscope (NSOM) with a pulsed laser source in this study. To understand the dominant mechanisms for the generation of the nano-patterns, a series of experimental measurement of the size and shape of nano-patterns generated on targets under different experimental conditions with different targets is conducted. The characteristic dimensions of nano-patterns show dependence on optical properties of the target material. The qualitative trend of the variation of nano-patterns as a function of laser and material conditions indicates that the dominant mechanisms for the generation of nano-patterns through a combination of nanosecond laser and an apertured NSOM under different conditions studied is near field laser-material interaction.

Adaptive vision-based detection of laser-material interaction for directed energy deposition

2020 ◽  
Vol 36 ◽  
pp. 101468
Author(s):  
Mohamed A. Naiel ◽  
Deniz Sera Ertay ◽  
Mihaela Vlasea ◽  
Paul Fieguth
Keyword(s):  
Energy Deposition ◽  
Laser Material ◽  
Directed Energy Deposition ◽  
Directed Energy ◽  
Material Interaction

Pulsed-CO2 laser-material interaction: thermomechanical effects

1993 ◽  
Author(s):  
Christophe Prat ◽  
Michel L. Autric ◽  
Georges Inglesakis
Keyword(s):  
Co2 Laser ◽  
Laser Material ◽  
Pulsed Co2 Laser ◽  
Material Interaction ◽  
Thermomechanical Effects

A Phase Field Approach for Modeling Melting and Re-Solidification of Ti-6Al-4V during Selective Laser Melting

2016 ◽  
Vol 704 ◽  
pp. 241-250 ◽  
Author(s):  
Peter Holfelder ◽  
Jin Ming Lu ◽  
Christian Krempaszky ◽  
Ewald A. Werner
Keyword(s):  
Selective Laser Melting ◽  
Phase Field ◽  
Field Model ◽  
Phase Field Model ◽  
Nucleation And Growth ◽  
Laser Melting ◽  
Laser Material ◽  
Field Approach ◽  
Multi Phase ◽  
Material Interaction

A Multi Phase Field model is proposed to describe the microstructure evolution induced by laser-material interaction in Selective Laser Melting (SLM). On the basis of the free enthalpy, the nucleation and growth processes occurring during the relevant phase transformations are explicitly taken into account. Within this contribution, the focus is laid on the SLM processing of the titanium alloy Ti-6Al-4V with special emphasis on the transition between β-titanium and melt. The results are discussed and compared to those of more conventional modelling approaches.

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