Role of laser-induced plasma in ultradeep drilling of materials by nanosecond laser pulses

2011 ◽  
Vol 257 (24) ◽  
pp. 10876-10882 ◽  
Author(s):  
Nadezhda M. Bulgakova ◽  
Anton B. Evtushenko ◽  
Yuri G. Shukhov ◽  
Sergey I. Kudryashov ◽  
Alexander V. Bulgakov
Keyword(s):  
Laser Pulses ◽  
Nanosecond Laser ◽  
Laser Induced Plasma ◽  
Nanosecond Laser Pulses

Role of electron heating in efficient interaction of a nanosecond laser with the cluster media: a case study on tetrahydrofuran cluster system

RSC Advances ◽  
2016 ◽  
Vol 6 (91) ◽  
pp. 87897-87904 ◽  
Author(s):  
Pramod Sharma ◽  
Soumitra Das ◽  
Rajesh K. Vatsa
Keyword(s):  
Mass Spectrometer ◽  
Time Of Flight ◽  
Laser Pulses ◽  
Nanosecond Laser ◽  
Electron Heating ◽  
Flight Mass Spectrometer ◽  
System P ◽  
Nanosecond Laser Pulses

Interaction of tetrahydrofuran clusters with nanosecond laser pulses has been investigated at 532 and 1064 nm, using a time-of-flight mass spectrometer and home-built electron analyzer setup.

scholarly journals Potassium Sulfate: A New Candidate to Explore Non-Photochemical Laser-Induced Nucleation Mechanisms

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1571
Author(s):  
Mélody Briard ◽  
Clément Brandel ◽  
Sandrine Morin-Grognet ◽  
Gérard Coquerel ◽  
Valérie Dupray
Keyword(s):  
Laser Pulses ◽  
Potassium Sulfate ◽  
Gas Content ◽  
Nanosecond Laser ◽  
Nucleation Behavior ◽  
Spontaneous Nucleation ◽  
Nucleation Mechanisms ◽  
Nanosecond Laser Pulses ◽  
Supersaturated Solutions

In this paper, we report a study on the nucleation behavior of potassium sulfate (K2SO4) from aqueous solutions under the influence of unfocused nanosecond laser pulses. The objective is to contribute to the general understanding of the Non-Photochemical Laser-Induced Nucleation (NPLIN) mechanism. First, the influence of several parameters such as supersaturation as well as laser parameters (pulse energy, number of pulses, and laser polarization) on induction time, probability of nucleation and mean number of crystals in comparison with spontaneous nucleation was investigated. Then, we examined the influence of gas composition (i.e., degassing and gas bubbling (CO2 and N2)) of the supersaturated solutions on the NPLIN kinetics, showing no correlation between gas content (or nature) on the crystallization behavior. Our study questions the role of impurities within the solution regarding the mechanism of laser-induced nucleation.

scholarly journals Temporally and Spatially Resolved Emission Spectroscopy of Cyanide, Hydrogen and Carbon in Laser-Induced Plasma

2019 ◽  
Author(s):  
Christian G. Parigger ◽  
Christopher M. Helstern ◽  
Ghaneshwar Gautam
Keyword(s):  
Atomic Hydrogen ◽  
Emission Spectroscopy ◽  
Local Equilibrium ◽  
Emission Spectra ◽  
Optical Emission ◽  
Laser Pulses ◽  
Nano Particles ◽  
Nanosecond Laser ◽  
Laser Induced Plasma ◽  
Nanosecond Laser Pulses

This work examines atomic and molecular signatures in laser-induced plasma in standard ambient temperature and pressure environments, including background contributions to the spectra that depend on the laser pulse-width. Investigations include solids, gases, and nano-particles. Abel inversions of measured line-of-sight data reveal insight into the radial plasma distribution. For nominal 6 nanosecond laser pulses and for pulse-energies in the range of 100 to 800 mJ, expansion dynamics and turbulence due to shock phenomena are elucidated to address local equilibrium details that are frequently assumed in spatially averaged emission spectroscopy. Chemical equilibrium computations reveal temperature dependence of selected plasma species. Specific interests include atomic hydrogen (H) and cyanide (CN). Atomic hydrogen spectra indicate axisymmetric shell structures and isentropic expansion of the plasma kernel over and above the usual shockwave. The recombination radiation of CN emanates within the first 100 nanoseconds for laser-induced breakdown in a 1:1 CO2:N2 gas mixture when using nanosecond laser pulses to create the micro-plasma. The micro-plasma is generated using 1064 nm, 150 mJ, 6 ns Q-switched Nd:YAG laser radiation. Measurements of the optical emission spectra utilize a 0.64 m Czerny-Turner type spectrometer and an intensified charge-coupled device.

scholarly journals Time-Resolved Emission Spectroscopy of Atomic and Molecular Species in Laser-Induced Plasma

2018 ◽  
Author(s):  
Christian Parigger ◽  
Ghaneshwar Gautam ◽  
Christopher M Helstern
Keyword(s):  
Emission Spectroscopy ◽  
Local Equilibrium ◽  
Optical Breakdown ◽  
Emission Spectra ◽  
Laser Pulses ◽  
Nano Particles ◽  
Nanosecond Laser ◽  
Pure Hydrogen ◽  
Laser Induced Plasma ◽  
Nanosecond Laser Pulses

This work examines atomic and molecular signatures in laser-induced plasma in standard ambient temperature and pressure environments, including background contributions to the spectra that depend on the laser pulse-width.  Investigations include solids, gases, and nano-particles. Abel inversions of measured line-of-sight data reveal insight into the radial plasma distribution. For nominal 6 nanosecond laser pulses and for pulse-energies in the range of 100 to 800 milli-Joules, expansion dynamics and turbulence due to shock phenomena are elucidated to address local equilibrium details that are frequently assumed in spatially averaged emission spectroscopy. Chemical equilibrium computations reveal temperature dependence of selected plasma species. Specific interests include atomic hydrogen (H) and cyanide (CN). The atomic H spectra, collected following optical breakdown in ultra-high-pure hydrogen and 9:1 mixtures of ultra-pure hydrogen and nitrogen gases, indicate spherical shell structures and isentropic expansion of the plasma kernel over and above the usual shockwave. The recombination radiation of CN emanates within the first 100 nanoseconds for laser-induced breakdown in a 1:1 CO2:N2 gas mixture when using nanosecond laser pulses to create the micro-plasma. The micro-plasma is generated using 1064 nm, 150 mJ, 6 ns Q-switched Nd:YAG  laser radiation. Measurements of the optical emission spectra utilize a 0.64 m Czerny-Turner type spectrometer and an intensified charge-coupled device.

Ablation of molecular solids under nanosecond laser pulses: The role of inertial confinement

2006 ◽  
Vol 89 (14) ◽  
pp. 141907 ◽  
Author(s):  
Danny Perez ◽  
Laurent J. Lewis ◽  
Patrick Lorazo ◽  
Michel Meunier
Keyword(s):  
Laser Pulses ◽  
Nanosecond Laser ◽  
Molecular Solids ◽  
Inertial Confinement ◽  
Nanosecond Laser Pulses

Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses

2010 ◽  
Vol 97-101 ◽  
pp. 3803-3806
Author(s):  
Yong Xiang Hu ◽  
Heng Zhang ◽  
Zheng Qiang Yao
Keyword(s):  
Cost Effective ◽  
Laser Pulses ◽  
Laser Beams ◽  
Nanosecond Laser ◽  
Effective Technique ◽  
First Order ◽  
Direct Fabrication ◽  
Cost Effective Technique ◽  
Nanosecond Laser Pulses ◽  
Micro Structuring

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

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