Laser ablation plasmas for diagnostics of structured electronic and optical materials during or after laser processing

2012 ◽  
Author(s):  
Richard E. Russo ◽  
Alexander A. Bol'shakov ◽  
Jong H. Yoo ◽  
Jhanis J. González
Keyword(s):  
Laser Ablation ◽  
Laser Processing ◽  
Optical Materials

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.

Optical materials for blue-laser processing

2021 ◽  
Author(s):  
Ralf Jedamzik ◽  
Antoine Carre ◽  
Volker Hagemann ◽  
Lothar Bartelmess ◽  
Sebastian Leukel ◽  
...  
Keyword(s):  
Laser Processing ◽  
Optical Materials ◽  
Blue Laser

High resolution selective multilayer laser processing by nanosecond laser ablation of metal nanoparticle films

2007 ◽  
Vol 102 (9) ◽  
pp. 093102 ◽  
Author(s):  
Seung H. Ko ◽  
Heng Pan ◽  
David J. Hwang ◽  
Jaewon Chung ◽  
Sangil Ryu ◽  
...  
Keyword(s):  
Laser Ablation ◽  
High Resolution ◽  
Laser Processing ◽  
Metal Nanoparticle ◽  
Nanosecond Laser ◽  
Nanoparticle Films ◽  
Nanosecond Laser Ablation

scholarly journals Thermal imaging of high power ultrashort pulse laser ablation of alumina towards temperature optimized micro machining strategies

2021 ◽  
Vol 1135 (1) ◽  
pp. 012027
Author(s):  
Stefan Rung ◽  
Niklas Häcker ◽  
Ralf Hellmann
Keyword(s):  
Laser Ablation ◽  
High Power ◽  
Thermal Imaging ◽  
Laser Processing ◽  
Removal Rate ◽  
Average Power ◽  
Pulsed Laser ◽  
Ir Camera ◽  
Laser Systems ◽  
Material Temperature

Abstract The application of pulsed laser systems with pulse durations in the pico- and femtosecond regime for material processing is commonly associated with a cold ablation. Due to the minimized interaction-time between the ultrashort laser pulses and the material, this statement is almost valid as long as no heat accumulation effect appears. With the increasing demand of high productivity processes, the average power of ultrashort pulsed laser systems increases above 100 W, which leads, however, to increased thermal effects during laser processing. This is especially important for laser processing of technical ceramics like alumina. Large temperatures gradients, which locally occur during laser processing using high average power could lead to thermal modifications and cracks in the material. In this study, we present a process-optimization method for high power laser ablation of alumina based on thermal imaging. The use of a 2D IR camera enables the estimation of the temperature distribution during the laser processing. We investigate the influence of laser power up to 80 W, pulse duration between 900 fs and 10 ps and processing duration on the resulting material temperature. Beside the material temperature we evaluate the material removal rate and the resulting surface quality.

Collection of Laser Ablation Products by Means of an Electrostatic Field

2021 ◽  
Vol 410 ◽  
pp. 748-752
Author(s):  
Ruslan V. Chkalov ◽  
Darya G. Chkalova
Keyword(s):  
Laser Radiation ◽  
Laser Ablation ◽  
Electrostatic Field ◽  
Laser Processing ◽  
Plasma Torch ◽  
Direct Interaction ◽  
Surface Layers ◽  
Laser Induced Plasma ◽  
Filtration System ◽  
Spatial Geometry

The work is devoted to the problem of controlled laser micromachining of materials surface layers. The problem of ablation products reverse deposition near the laser processing region is considered. Laser ablation products, in addition to direct interaction with laser radiation, significantly increase lifetime and temperature of laser-induced plasma torch, which leads to decrease in energy entering processing area, as a result of which not removal, but heating of coating material occurs. Ablated particles can be deposited on the processed samples surface, which causes distortions in recorded structure spatial geometry. The possibility of using an electrostatic filtration system is considered as a method for protecting treated surface.

Instabilities and Structure Formation in Laser Processing

1995 ◽  
Vol 397 ◽  
Author(s):  
D. Bàuerle ◽  
E. Arenholz ◽  
N. Arnold ◽  
J. Heitz ◽  
P.B. Kargl
Keyword(s):  
Chemical Vapor Deposition ◽  
Laser Ablation ◽  
Structure Formation ◽  
Coherent Structures ◽  
Vapor Deposition ◽  
Laser Processing ◽  
Chemical Vapor ◽  
Surface Modifications ◽  
Different Types

ABSTRACTThis paper gives an overview on different types of instabilities and structure formation in various fields of laser processing. Among the examples discussed in detail are non-coherent structures observed in laser-induced chemical vapor deposition (LCVD), in laser-induced surface modifications, and in laser ablation of polymers.

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