Effects of Repetition Rates, Pulse Number and Laser Fluence on Ablation Efficiency in Metal Processing With Ultrafast Laser Bursts

2021 ◽  
Author(s):  
Xiao Jia ◽  
Xin Zhao
Keyword(s):  
Laser Fluence ◽  
Pulse Number ◽  
Ultrafast Laser ◽  
Ablation Efficiency ◽  
Metal Processing

scholarly journals Laser fluence dependence on emission dynamics of ultrafast laser induced copper plasma

2016 ◽  
Vol 120 (18) ◽  
pp. 185901 ◽  
Author(s):  
K. K. Anoop ◽  
S. S. Harilal ◽  
Reji Philip ◽  
R. Bruzzese ◽  
S. Amoruso
Keyword(s):  
Laser Fluence ◽  
Ultrafast Laser ◽  
Copper Plasma ◽  
Fluence Dependence

Dynamics of Ultrafast Laser Induced Damage in Single Crystal Ni-based Superalloy During Machining

2006 ◽  
Vol 980 ◽  
Author(s):  
Joel P. McDonald ◽  
Shuwei Ma ◽  
John A. Nees ◽  
Tresa M. Pollock ◽  
Steven M. Yalisove
Keyword(s):  
Shock Wave ◽  
Laser Fluence ◽  
Ultrafast Laser ◽  
Laser Exposure ◽  
Mechanical Shock ◽  
Incident Laser ◽  
Machining Time ◽  
Time Resolved ◽  
Pump Probe ◽  
Laser Induced Damage

AbstractPump-probe imaging of femtosecond pulsed laser ablation was performed to investigate the mechanical shock induced on an intermetallic superalloy CMSX-4 during femtosecond laser machining. Time resolved shadowgraphic images were collected of the shock wave produced in the air above the target following laser exposure (0-10.3 nanoseconds). The dimensions of the shock wave were measured as a function of delay time and laser fluence (1.27 J/cm2 - 62.8 J/cm2). Time-resolved shadowgraphic images of the ablation event will be presented, and the corresponding damage morphology as a function of incident laser fluence will be discussed.

Ablation Dynamics of Silicon by Femtosecond Laser and the Role of Early Plasma

2013 ◽  
Vol 135 (6) ◽  
Author(s):  
X. Zhao ◽  
Y. C. Shin
Keyword(s):  
Femtosecond Laser ◽  
Laser Fluence ◽  
Energy Transport ◽  
Femtosecond Laser Ablation ◽  
Heat Diffusion ◽  
Photon Absorption ◽  
Ablation Efficiency ◽  
Two Photon Absorption ◽  
Laser Fluences ◽  
Plasma Absorption

In this paper, the femtosecond laser ablation of silicon is investigated by a two-dimensional hydrodynamic model. The ablation depth of the silicon wafer ablated in air at different laser intensities is calculated, and the corresponding experimental measurements are carried out for validation. Two different ablation regimes have been identified by varying the laser fluence. While two-photon absorption dominates in the low fluence regime (<2 J/cm2), electron heat diffusion is a major energy transport mechanism at higher laser fluences (>2 J/cm2). The ablation efficiency first increases with the laser fluence, and reaches the peak value at the laser fluence around 8 J/cm2. It starts to drop when the laser fluence further increases, because of the early plasma absorption of the laser beam energy.

Ultrafast laser ablation ICP-MS: role of spot size, laser fluence, and repetition rate in signal intensity and elemental fractionation

2014 ◽  
Vol 29 (2) ◽  
pp. 339-346 ◽  
Author(s):  
Prasoon K. Diwakar ◽  
Jhanis J. Gonzalez ◽  
Sivanandan S. Harilal ◽  
Richard E. Russo ◽  
Ahmed Hassanein
Keyword(s):  
Laser Ablation ◽  
Laser Fluence ◽  
Repetition Rate ◽  
Signal Intensity ◽  
Spot Size ◽  
Ultrafast Laser ◽  
Elemental Fractionation ◽  
Icp Ms ◽  
Ultrafast Laser Ablation

Dependence of birefringence and residual stress near laser-induced cracks in fused silica on laser fluence and on laser-pulse number

1998 ◽  
Vol 37 (33) ◽  
pp. 7772 ◽  
Author(s):  
Faiz Dahmani ◽  
Ansgar W. Schmid ◽  
John C. Lambropoulos ◽  
Stephen Burns
Keyword(s):  
Residual Stress ◽  
Laser Pulse ◽  
Laser Fluence ◽  
Pulse Number ◽  
Fused Silica

OPTIMIZATION OF GOLD AND SILVER NANOPARTICLES PRODUCTION BY LASER ABLATION IN DEIONIZED WATER

2015 ◽  
Vol 74 (8) ◽  
Author(s):  
Mohammed A. Al-Azawi ◽  
Noriah Bidin ◽  
M. Abdullah ◽  
Khaldoon N. A.
Keyword(s):  
Silver Nanoparticles ◽  
Laser Fluence ◽  
Average Particle Size ◽  
Laser Pulses ◽  
Deionized Water ◽  
Average Particle ◽  
Beam Diameter ◽  
Colloidal Solutions ◽  
Gold And Silver Nanoparticles ◽  
Ablation Efficiency

Colloidal solutions of gold and silver nanoparticles (NPs) were synthesized using a Q-switched Nd:YAG laser (1064 nm, 6 ns, 1 Hz ) ablation. Gold and silver bars were immersed in deionized water and irradiated by laser pulses for 4 min. The laser fluence was verified within the range of 21 – 39 J/cm2 with a fixed beam diameter of 1.6 mm. The effect of laser pulse fluence on both size and ablation efficiency of gold and silver nanoparticles were studied. The optical spectral characterization and morphological analysis of these nanoparticles were carried out by UV-Vis spectrophotometer and transmission electron microscopy (TEM), respectively. The average particle size for Au and Ag are 38.0 ± 10.3 nm and 31.3 ± 10.5 nm at corresponding optimized laser fluence of 31 and 25 Jcm-2 respectively.

Real-Time Monitoring of Indium Tin Oxide Laser Ablation in Liquid Crystal Display Patterning

1998 ◽  
Vol 526 ◽  
Author(s):  
M.H. Hong ◽  
Y.F. Lu ◽  
M. Meng ◽  
T.S. Low
Keyword(s):  
Laser Ablation ◽  
Acoustic Wave ◽  
Laser Fluence ◽  
Indium Tin Oxide ◽  
Glass Substrate ◽  
Ablation Threshold ◽  
Liquid Crystal Display ◽  
Pulse Number ◽  
Spectral Lines ◽  
Spectral Intensities

AbstractAudible acoustic wave detection is applied to investigate KrF excimer laser ablation of Indium Tin Oxide (ITO) thin film layer for Liquid Crystal Display (LCD) patterning. It is found that there is no acoustic wave generation if laser fluence is lower than ITO ablation threshold. For laser fluence higher than the threshold, audible acoustic wave will be detected due to shock wave generation during ITO laser ablation. The amplitude of the acoustic wave is closely related to the laser ablation rate. With more laser pulse applied, the amplitude is dropped to zero because the ITO layer is completely removed. However, if laser fluence is increased higher than ablation threshold for glass substrate, the amplitude is also dropped with pulse number but not to zero. It is due to laser ablation of ITO layer and glass substrate at the same time. Since the thickness of ITO layer is in a scale of 100 nm, laser interaction with glass substrate will happen even at the first pulse of high laser fluence irradiation. Laser ablation induced ITO plasma emission spectrum in visible light region is analyzed by an Optical Multi-channel Analyzer (OMA). Specific spectral lines are In I (325.8, 410.2 and 451.1 nm) and In II 591.1 nm. Spectral intensities of 410.2 and 451.1 nm lines are selected to characterize the evolution of ITO plasma intensity with laser fluence and pulse number. It is found that the spectral intensities are reduced to zero with laser pulse number. It is also found that spectral lines other than ITO plasma will appear for laser fluence higher than ablation threshold for glass substrate. Threshold fluences for glass and ITO ablation are estimated for setting up a parameter window to control LCD patterning in real-time.

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