Laser ablation of Si in water and ambient air

2002 ◽  
Author(s):  
Sha Zhu ◽  
Minghui Hong ◽  
M. L. Koh ◽  
Yongfeng Lu
Keyword(s):  
Laser Ablation ◽  
Ambient Air

scholarly journals Study of the formation of 3-D titania nanofibrous structure by MHz femtosecond laser in ambient air

2021 ◽  
Author(s):  
Amirhossein Tavangar ◽  
Bo Tan ◽  
Krishnan Venkatakrishnan
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Deposition Rate ◽  
Femtosecond Laser Ablation ◽  
Ambient Air ◽  
Experimental Results ◽  
Laser Parameters ◽  
Nanofibrous Structure ◽  
Titania Nanostructures ◽  
Multiple Pulses

In this study, we describe the formation mechanism of web-like three-dimensional (3-D) titania nanofibrous structures during femtosecond laser ablation of titanium (Ti) targets in the presence of background air. First, we demonstrate the mechanism of ablation of Ti targets by multiple femtosecond laser pulses at ambient air in an explicit analytical form. The formulas for evaporation rates and the number of ablated particles, which is analogous to the deposition rate of the synthesized nanofibers, for the ablation by a single pulse and multiple pulses as a function of laser parameters, background gas, and material properties are predicted and compared to experimental results. Afterwards, the formation of nanofibrous structures is demonstrated by applying an existing simplified kinetic model to Ti targets and ambient conditions. The predicted theory provides nanofiber diameter dependency with the combination of laser parameters, target properties, and ambient gas characteristics. Experimental studies are then performed on titania nanofibrous structures synthesized by laser ablation of Ti targets using MHz repletion-rate femtosecond laser at ambient air. The models' predictions are then compared with the experimental results, where nanostructures with different morphologies are manufactured by altering laser parameters. Our results indicate that femtosecond laser ablation of Ti targets at air background yields crystalline titania nanostructures. The formation of crystalline titania nanostructures is preceded b thermal mechanism of nucleation and growth. The results point out that laser pulse repetition and dwell time can control the density, size, and pore size of the engineered nanofibrous structure. As the deposition rate of nanostructures is analogous to the ablation rate of the target, higher density of nanofibrous structure is seen at greater laser fluences. The predicted theory can be applied to predict ablation mechanism and nanofiber formation of different materials.

Femtosecond pulse laser ablation of sapphire in ambient air

2004 ◽  
Vol 228 (1-4) ◽  
pp. 221-226 ◽  
Author(s):  
X.C. Wang ◽  
G.C. Lim ◽  
H.Y. Zheng ◽  
F.L. Ng ◽  
W. Liu ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulse Laser ◽  
Femtosecond Pulse ◽  
Pulse Laser Ablation ◽  
Ambient Air ◽  
Femtosecond Pulse Laser

Nanoparticle formation by the debris produced by femtosecond laser ablation of silicon in ambient air

2008 ◽  
Vol 62 (14) ◽  
pp. 2165-2170 ◽  
Author(s):  
N.G. Semaltianos ◽  
W. Perrie ◽  
V. Vishnyakov ◽  
R. Murray ◽  
C.J. Williams ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Ambient Air ◽  
Nanoparticle Formation

Underwater Laser Turning of Commercially-Pure Titanium

2020 ◽  
Vol 861 ◽  
pp. 23-27
Author(s):  
Wisan Charee ◽  
Viboon Tangwarodomnukun
Keyword(s):  
Surface Roughness ◽  
Laser Ablation ◽  
Laser Power ◽  
Pure Titanium ◽  
Ambient Air ◽  
Machining Process ◽  
Commercially Pure Titanium ◽  
Turning Process ◽  
Commercially Pure ◽  
Underwater Laser

Underwater laser machining process is a material removal technique that can minimize thermal damage and offer a higher machining rate than the laser ablation in ambient air. This study applied the underwater method associated with a nanosecond pulse laser for turning a commercially pure titanium rod. The effects of laser power, surface speed and number of laser passes on machined depth and surface roughness were investigated in this work. The results revealed that a deeper cut depth and smoother machined surface than those obtained from the laser ablation in ambient air were achievable when the underwater laser turning process was applied. The machined depth and surface roughness were found to significantly increase with the laser power and number of laser passes. The findings of this study can disclose the insight as well as potential of the underwater laser turning process for titanium and other similar metals.

Ultrashort pulse laser ablation of steel in ambient air

2022 ◽  
Vol 148 ◽  
pp. 107757
Author(s):  
V. Zinnecker ◽  
S. Madden ◽  
C. Stokes-Griffin ◽  
P. Compston ◽  
A.V. Rode ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Pulse Laser ◽  
Ultrashort Pulse ◽  
Pulse Laser Ablation ◽  
Ambient Air ◽  
Ultrashort Pulse Laser

scholarly journals Femtosecond laser ablation of brass: A study of surface morphology and ablation rate

2012 ◽  
Vol 30 (3) ◽  
pp. 473-479 ◽  
Author(s):  
Mohamed E. Shaheen ◽  
Brian J. Fryer
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Surface Morphology ◽  
Fine Particles ◽  
Femtosecond Laser Ablation ◽  
Laser Pulses ◽  
Ambient Air ◽  
Ablation Rate ◽  
Femtosecond Laser Pulses ◽  
Nanosecond Laser

AbstractThe interaction of near infrared femtosecond laser pulses with a Cu based alloy (brass) in ambient air at atmospheric pressure and under different laser conditions was investigated. The effects of laser fluence and number of pulses on surface morphology and ablation rate were studied using scanning electron microscopy (SEM) and optical microscopy. Ablation rates were found to rapidly increase from 83 to 604 nm/pulse in the fluence range 1.14–12.21 J/cm2. At fluence >12.21 J/cm2, ablation rates increased slowly to a maximum (607 nm/pulse at 19.14 J/cm2), and then decreased at fluence higher than 20.47 J/cm2 to 564 nm/pulse at 24.89 J/cm2. Large amounts of ablated material in a form of agglomerated fine particles were observed around the ablation craters as the number of laser pulses and fluence increased. The study of surface morphology shows reduced thermal effects with femtosecond laser ablation in comparison to nanosecond laser ablation at low fluence.

Femtosecond laser ablation of polytetrafluoroethylene (Teflon) in ambient air

2003 ◽  
Vol 93 (10) ◽  
pp. 6375-6380 ◽  
Author(s):  
Z. B. Wang ◽  
M. H. Hong ◽  
Y. F. Lu ◽  
D. J. Wu ◽  
B. Lan ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Ambient Air
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