Effect of laser fluence on the ablation rate of metals in the infrared, visible, and ultraviolet nanosecond pulses irradiation regime

2008 ◽  
Author(s):  
Mihai Stafe ◽  
Ionut Vladoiu ◽  
Constantin Negutu ◽  
Ion M. Popescu
Keyword(s):  
Laser Fluence ◽  
Ablation Rate ◽  
Irradiation Regime ◽  
Nanosecond Pulses

Picosecond Laser Ablation of Polydimethylsiloxane (PDMS)

2009 ◽  
Author(s):  
Hansong Zeng ◽  
Yi Zhao ◽  
Benxin Wu ◽  
Chris Taylor ◽  
Ronald L. Jacobsen ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Laser Fluence ◽  
Picosecond Laser ◽  
Ablation Rate ◽  
Pulse Number ◽  
Hole Diameter ◽  
Replica Molding

Picosecond laser ablation of Polydimethylsiloxane (PDMS) has been studied experimentally. The measurements show that laser ablation rate per pulse increases with laser fluence and pulse number. The laser-drilled hole diameter increases with pulse number, and it saturates above certain pulse number for low fluence. The study shows that picosecond laser ablation may provide a good solution for micromachining PDMS, which is more flexible and versatile than the replica molding technique.

Ablation study of laser micromachining process with molecular dynamics simulation

2016 ◽  
Vol 231 (3) ◽  
pp. 415-426 ◽  
Author(s):  
Angelos P Markopoulos ◽  
Dimitrios E Manolakos
Keyword(s):  
Molecular Dynamics ◽  
Laser Ablation ◽  
Laser Fluence ◽  
Three Dimensional ◽  
Ablation Rate ◽  
Dynamics Simulation ◽  
Entire Duration ◽  
Micro Hole ◽  
System Temperature ◽  
Ablation Study

A three-dimensional molecular dynamics model is presented for the simulation of the creation of a micro-hole on a thin film metal substrate via laser ablation. For the presented analysis, molybdenum and aluminium specimens are selected and short pulses are assumed. The laser fluence takes several values between 0.5 and 20 J/cm2. The proposed models include significant laser ablation phenomena such as plasma shielding. However, they are not computationally intense. In this study, the Morse potential is used for the interactions of the atoms of the specimens. The analysis is carried out in order to investigate the ablation rate, the ablation depth and the mean temperature of molybdenum and aluminium targets under their heating by the laser beam, for several different values of fluence. Results for molybdenum indicate that as fluence increases, it takes less time for the atoms to be ablated. For low-fluence pulses, more than one pulse may be required for the ablation of all atoms. For high-fluence pulses, the ablation is not uniform across the entire duration of the pulse and the specimen is overheated. A fluence value around 2–3 J/cm2 is suggested for uniform ablation. From the analysis, it is evident that the evolution of ablation and system temperature is different for molybdenum and aluminium, for the same laser fluence. This is attributed to different crystalline structures and absorptivity of each material. It may be said that molecular dynamics prove to be a powerful tool for the simulation of nanomanufacturing processes and useful conclusions are drawn from the analysis.

Processing Characteristics and Parametric Effects on Picosecond Laser Nanoscaled Patterning of Poly(methyl methacrylate)

2020 ◽  
Vol 20 (8) ◽  
pp. 5142-5146
Author(s):  
Ching-Yen Ho ◽  
Zui-Wei Liu ◽  
Xian-Liang Chen ◽  
Dongkai Qiao ◽  
Chang-Wei Xiong ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Laser Fluence ◽  
Electronic Devices ◽  
Pulsed Laser ◽  
Picosecond Laser ◽  
Ablation Rate ◽  
Poly Methyl Methacrylate ◽  
Nanoscale Patterning ◽  
Parametric Effects ◽  
Noncontact Processing

Characteristics of picosecond laser processing for poly(methyl methacrylate) (PMMA) are studied in this text. Poly(methyl methacrylate) (PMMA) can be applied to micro- or nano-scale electronic devices. Short-pulsed laser is usually used for noncontact processing of nanoscale patterning of poly(methyl methacrylate) (PMMA). This study considers optical energy of laser to be transferred into decomposition energy of poly(methyl methacrylate) (PMMA). Using the condition of the energy balance at the decomposition interface, the variation of the ablation rate with the logarithm of the laser fluence is calculated for poly(methyl methacrylate) (PMMA) and agrees with the measured data. This study also discusses parametric effects of poly(methyl methacrylate) (PMMA) on the variation of the ablation rate with the logarithm of the laser fluence.

Laser Induced Forward Transfer: Topography Dependence of Laser Fluence and Thickness for Titanium Film

2018 ◽  
Author(s):  
Jie Zhao ◽  
Yongxiang Hu ◽  
Zhenqiang Yao
Keyword(s):  
Laser Fluence ◽  
Physical Mechanism ◽  
Sacrificial Layer ◽  
High Melting ◽  
High Melting Point ◽  
Titanium Film ◽  
Nanosecond Pulses ◽  
Wide Range ◽  
Forward Transfer ◽  
Ti Films

Compared with other metals, titanium has a wide range of applications in laser induced forward transfer (LIFT) due to its unique properties of low thermal conductivity and high melting point. In general, the titanium film is used as a sacrificial layer or transferred material in LIFT with different laser fluence. In this study, four different topography types are classified under the laser irradiation of ultraviolet nanosecond pulses. For Ti films with different thicknesses, probability distribution of these types is provided to demonstrate how topographies evolve with the increasing laser fluence. Through the research, the understanding of the physical mechanism of titanium film would be deepened.

High Resolution Displacement of Functional Groups onto Fluorocarbon Resin Surface by Using ArF Excimer Laser

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Shimizu ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
High Resolution ◽  
Laser Beam ◽  
Thin Layer ◽  
Functional Groups ◽  
Excimer Laser ◽  
Laser Fluence ◽  
Large Area ◽  
Three Solutions ◽  
Arf Excimer Laser

ABSTRACTA Fluorocarbon resin surface was selectively modified by irradiation with a ArF laser beam through a thin layer of NaAlO2, B(OH)3, or H2O solution to give a hydrophilic property. As a result, with low fluence, the surface was most effectively modified with the NaAlO2 solution among the three solutions. However, the contact angle in this case changed by 10 degrees as the fluence changed only 1mJ/cm2. When modifying a large area of the surface, high resolution displacement could not be achieved because the laser beam was not uniform in displacing functional groups. Thus, the laser fluence was successfully made uniform by homogenizing the laser beam; the functional groups were replaced on the fluorocarbon resin surface with high resolution, which was successfully modified to be hydrophilic by distributing the laser fluence uniformly.

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