Intense terahertz supercontinuum generated from ultrashort laser induced plasma of metal foil

Abstract This work proposes a physically consistent numerical model to simulate ultrashort laser absorption by a metallic workpiece at the water-metal interface when optical breakdown of the dielectric occurs. The simulation couples the framework of the Finite-Difference Time-Domain method used in computational electromagnetics with the constitutive relation derived from both the model of direct ablation of metals and the first order model of water breakdown. The simulation is used to describe interface ablation processes such as Laser-Induced Plasma Micro-Machining. Applied to the water-aluminum interface, the model is able to describe the metal absorption and the dielectric breakdown threshold in three-dimensional geometry. It is an extensible monolithic approach in which the absorption by different materials can be described by simply changing the constitutive relations.

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A study of balancing the competing effects of ultrashort laser induced plasma for optimal laser machining

Applied Surface Science ◽

10.1016/j.apsusc.2006.07.029 ◽

2007 ◽

Vol 253 (7) ◽

pp. 3408-3412 ◽

Cited By ~ 6

Author(s):

H.Y. Zheng ◽

Y.Z. Deng ◽

S.R. Vatsya ◽

S.K. Nikumb

Keyword(s):

Laser Machining ◽

Laser Induced Plasma ◽

Ultrashort Laser

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Laser-Induced Plasma Micromachining Process: Principles and Performance

Journal of Micro and Nano-Manufacturing ◽

10.1115/1.4030706 ◽

2015 ◽

Vol 3 (3) ◽

Cited By ~ 6

Author(s):

Kumar Pallav ◽

Ishan Saxena ◽

K. F. Ehmann

Keyword(s):

Material Removal ◽

Dielectric Breakdown ◽

Dielectric Material ◽

Experimental Conditions ◽

Plasma Generation ◽

Laser Induced Plasma ◽

Wide Range ◽

Matter Interaction ◽

And Performance ◽

Ultrashort Laser

Laser-induced plasma micromachining (LIP-MM) is a novel multimaterial and tool-less micromachining process. It utilizes tightly focused ultrashort laser irradiation to generate plasma through laser-induced dielectric breakdown in a dielectric material. The plasma facilitates material removal through plasma–matter interaction spot through vaporization and ablation. The paper introduces the LIP-MM process, discusses the underlying principles behind plasma generation and machining, and proves its feasibility by describing the experimental conditions under which plasma generation and machining occur. Upon successful commercial realization of this novel process, the key benefits envisaged are micromachining with better accuracy and better surface integrity, minimal subsurface damage, relatively smaller heat-affected zone (HAZ) and low roughness in a wide range of materials including those that are difficult to machine by some of the most successful micromachining processes such as micro-electrodischarge machining (EDM) and laser ablation.

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Intense Terahertz supercontinuum generated from ult-r ashort laser induced plasma of metal foil

2012 Abstracts IEEE International Conference on Plasma Science ◽

10.1109/plasma.2012.6384071 ◽

2012 ◽

Author(s):

C. Zhang ◽

K. Mu

Keyword(s):

Metal Foil ◽

Laser Induced Plasma

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Laser vaporization of cirrus-like ice particles with secondary ice multiplication

Science Advances ◽

10.1126/sciadv.1501912 ◽

2016 ◽

Vol 2 (5) ◽

pp. e1501912 ◽

Cited By ~ 11

Author(s):

Mary Matthews ◽

François Pomel ◽

Christiane Wender ◽

Alexei Kiselev ◽

Denis Duft ◽

...

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Nucleation And Growth ◽

Laser Vaporization ◽

Laser Illumination ◽

Laser Induced Plasma ◽

Ice Particles ◽

Ice Multiplication ◽

Ultrashort Laser

We investigate the interaction of ultrashort laser filaments with individual 90-μm ice particles, representative of cirrus particles. The ice particles fragment under laser illumination. By monitoring the evolution of the corresponding ice/vapor system at up to 140,000 frames per second over 30 ms, we conclude that a shockwave vaporization supersaturates the neighboring region relative to ice, allowing the nucleation and growth of new ice particles, supported by laser-induced plasma photochemistry. This process constitutes the first direct observation of filament-induced secondary ice multiplication, a process that strongly modifies the particle size distribution and, thus, the albedo of typical cirrus clouds.

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