scholarly journals Convoluted effect of laser fluence and pulse duration on the property of a nanosecond laser-induced plasma into an argon ambient gas at the atmospheric pressure

2013 ◽  
Vol 113 (1) ◽  
pp. 013304 ◽  
Author(s):  
Xueshi Bai ◽  
Qianli Ma ◽  
Vincent Motto-Ros ◽  
Jin Yu ◽  
David Sabourdy ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Laser Fluence ◽  
Atmospheric Pressure ◽  
Nanosecond Laser ◽  
Laser Induced Plasma ◽  
Ambient Gas

Methane Decomposition Using Metal-Assisted Nanosecond Laser-Induced Plasma at Atmospheric Pressure

2014 ◽  
Vol 118 (51) ◽  
pp. 29822-29835 ◽  
Author(s):  
Z. Ghorbani ◽  
P. Parvin ◽  
A. Reyhani ◽  
S. Z. Mortazavi ◽  
A. Moosakhani ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Methane Decomposition ◽  
Nanosecond Laser ◽  
Laser Induced Plasma

scholarly journals Laser-induced ablation of tantalum in a wide range of pulse durations

2020 ◽  
Vol 126 (9) ◽  
Author(s):  
Steffen Mittelmann ◽  
Jannis Oelmann ◽  
Sebastijan Brezinsek ◽  
Ding Wu ◽  
Hongbin Ding ◽  
...  
Keyword(s):  
Confocal Microscopy ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Pulse Duration ◽  
Laser Fluence ◽  
Crater Depth ◽  
Nanosecond Laser ◽  
Threshold Fluence ◽  
Wide Range ◽  
Laser Systems

Abstract We present data and analysis of the laser-induced ablation of pure tantalum (Ta, $$Z=73$$ Z = 73 ). We have identified different physical regimes using a wide range of laser pulse durations. A comparison of the influence of strongly varying laser pulse parameters on high-Z materials is presented. The crater depth caused by three different laser systems of pulse duration $${\varDelta }\tau _1=5\,\mathrm {ns}$$ Δ τ 1 = 5 ns and wavelength $$\lambda _1=1064\,\mathrm {nm}$$ λ 1 = 1064 nm , $${\varDelta }\tau _2=35\,\mathrm {ps}$$ Δ τ 2 = 35 ps , $$\lambda _2=355\,\mathrm {nm}$$ λ 2 = 355 nm and $${\varDelta }\tau _3=8.5\,\mathrm {fs}$$ Δ τ 3 = 8.5 fs , $$\lambda _3=790\,\mathrm {nm}$$ λ 3 = 790 nm are analyzed via confocal microscopy as a function of laser fluence and intensity. The minimum laser fluence needed for ablation, called threshold fluence, decreases with shorter pulse duration from $$1.10\,\mathrm {J/cm}^2$$ 1.10 J / cm 2 for the nanosecond laser to $$0.17\,\mathrm {J/cm}^2$$ 0.17 J / cm 2 for the femtosecond laser.

Experimental study of laser-induced plasma: Influence of laser fluence and pulse duration

2013 ◽  
Vol 87 ◽  
pp. 27-35 ◽  
Author(s):  
Xueshi Bai ◽  
Qianli Ma ◽  
Maxime Perrier ◽  
Vincent Motto-Ros ◽  
David Sabourdy ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pulse Duration ◽  
Laser Fluence ◽  
Laser Induced Plasma

Deposition of particulate-free thin films by two synchronised laser sources: effects of ambient gas pressure and laser fluence

2004 ◽  
Vol 446 (2) ◽  
pp. 178-183 ◽  
Author(s):  
E. György ◽  
I.N. Mihailescu ◽  
M. Kompitsas ◽  
A. Giannoudakos
Keyword(s):  
Thin Films ◽  
Laser Fluence ◽  
Gas Pressure ◽  
Laser Sources ◽  
Ambient Gas

A New Double Laser Recrystallization Technique to Induce Ultra-Large Poly-Si Grains

2001 ◽  
Vol 685 ◽  
Author(s):  
Minghong Lee ◽  
Seungjae Moon ◽  
Mutsuko Hatano ◽  
Costas P. Grigoropoulos
Keyword(s):  
Grain Growth ◽  
Excimer Laser ◽  
Laser Fluence ◽  
Laser Power ◽  
Laser Flash ◽  
Process Window ◽  
Nanosecond Laser ◽  
Solidification Velocity ◽  
Laser Recrystallization ◽  
Nucleation Sites

AbstractA new double laser recrystallization technique that can produce lateral grains of tens of micrometers is presented. A nanosecond laser (excimer or Nd:YLF laser) and a pulse modulated Ar+ laser are used in the experiment. The effect of different parameters on lateral grain growth is investigated. These parameters include the time delay between the two lasers, the excimer laser fluence, the Ar+ laser power and the pulse duration. This process has wide process window and is insensitive to both the excimer laser fluence and the Ar+ laser power fluctuations. Preheating and melting of the a-Si film with the Ar+ laser before firing the excimer laser is found to be necessary for inducting lateral grain growth. The transient excimer laser irradiation is believed to generate nucleation sites for initiating the subsequent lateral grain growth. The solidification dynamics of the process is probed by high spatial and temporal resolution laser flash photography. A lateral solidification velocity of about 10 m/s is observed.

Development of High-Performance Polycrystalline CVD Diamond Coated Cutting Tool Edge With Femtosecond Laser

2020 ◽  
Author(s):  
Xiaoxu Liu ◽  
Kohei Natsume ◽  
Satoru Maegawa ◽  
Fumihiro Itoigawa
Keyword(s):  
Surface Modification ◽  
Femtosecond Laser ◽  
Pulse Laser ◽  
Laser Fluence ◽  
High Performance ◽  
Short Pulse ◽  
Cvd Diamond ◽  
Diamond Surface ◽  
Nanosecond Laser ◽  
Tool Edge

Abstract To realize the high performance of CVD diamond coated tools, a tool edge shaping process named pulse laser grinding (PLG) was developed with short pulse laser in our group previously. In this study, femtosecond laser was innovatively to be used to conduct the PLG process, since femtosecond laser is famous for its less thermal impact and some newly reported surface modification effect. The results show that PLG processing under high laser fluence of femtosecond laser could achieve roundness around 1 μm, which is similar to that of conventional PLG process with nanosecond laser, although the roughness of processed surface has been worse due to the redeposited debris. Furthermore, an interesting phenomenon has been confirmed again that under low laser fluence irradiation of femtosecond laser, the CVD diamond surface shows improved crystallinity of diamond structure. Based on this, a two-step tool edge processing method was proposed, which could realize the edge shaping and surface modification together with one laser processor. And the results show that the processed tool edge with much less edge roundness and surface roughness, and the tip part with better diamond crystallinity, indicating that sharper and hardness tool edge could be possibly to be realized with femtosecond laser.

scholarly journals Pico- to nanosecond pulsed laser-induced forward transfer (LIFT) of silver nanoparticle inks: a comparative study

2019 ◽  
Vol 125 (12) ◽  
Author(s):  
J. Mikšys ◽  
G. Arutinov ◽  
G. R. B. E. Römer
Keyword(s):  
Surface Area ◽  
Silver Nanoparticle ◽  
Laser Fluence ◽  
Printed Electronics ◽  
Functional Materials ◽  
Picosecond Laser ◽  
Processing Parameters ◽  
Nanosecond Laser ◽  
Forward Transfer ◽  
Nanoparticle Inks

Abstract Silver nanoparticle inks are among the key functional materials used in printed electronics. Depositing it by laser-induced forward transfer remains a challenging task because the non-linear rheological nature of these inks narrows the range of the laser processing parameters. Understanding, therefore, the influence of the laser parameters on the ejection dynamics and deposition quality is of critical importance. The influence of the laser pulse duration from pico- to nanosecond-laser-induced jet dynamics was investigated using time-resolved shadowgraphy imaging. Jet speed and surface area analyses showed that in the lower laser fluence level range, picosecond pulses induce higher surface area ejections which propagate at higher velocities. As the laser fluence levels were increased, the difference in jet velocity and surface area evolutions narrows. Deposition analysis showed a similar behavior with lower transfer thresholds and larger depositions at lower fluence range when picosecond-laser pulses were used.

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