Correlation among the laser-induced breakdown thresholds in solids, liquids, and gases

Bettis, J. R.

doi:10.1364/ao.31.003448

Cited by 47 publications

(17 citation statements)

References 16 publications

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“…Also the intensity of the laser irradiation is too small to induce a gas breakdown, which needs a threshold irradiation of I br = 3 × 10 10 W/cm 2 [19]. Even in the presence of a metal surface, which lowers this threshold by two orders of magnitude, no direct gas breakdown will evolve.…”

Section: Comparison With Different Technologiesmentioning

confidence: 99%

Nitridation of iron by CW-CO2 laser nitriding technologies

Sun

Liu

Yang

et al. 2005

Materials Science and Engineering: B

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Section: Comparison With Different Technologiesmentioning

confidence: 99%

Nitridation of iron by CW-CO2 laser nitriding technologies

Sun

Liu

Yang

et al. 2005

Materials Science and Engineering: B

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“…78 The laser intensity is low enough that gas breakdown cannot occur, which needs a threshold intensity of 3x 10 10 W/cm 2 . 32,79 The threshold can be reduced by two orders of magnitude when a metal surface is place in the nitrogen atmosphere. 80 So we conclude the laser will react only on the niobium surface and not with the nitrogen present in the chamber.…”

Section: Experimental Details a Fluence Range To Be Exploredmentioning

confidence: 99%

Laser Processing of Metals and Polymers

Singaravelu

2012

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A laser offers a unique set of opportunities for precise delivery of high quality coherent energy. This energy can be tailored to alter the properties of material allowing a very flexible adjustment of the interaction that can lead to melting, vaporization, or just surface modification. Nowadays laser systems can be found in nearly all branches of research and industry for numerous applications. Sufficient evidence exists in the literature to suggest that further advancements in the field of laser material processing will rely significantly on the development of new process schemes. As a result they can be applied in various applications starting from fundamental research on systems, materials and processes performed on a scientific and technical basis for the industrial needs. The interaction of intense laser radiation with solid surfaces has extensively been studied for many years, in part, for development of possible applications. In this thesis, I present several applications of laser processing of metals and polymers including polishing niobium surface, producing a superconducting phase niobium nitride and depositing thin films of niobium nitride and organic material (cyclic olefin copolymer).The treated materials were examined by scanning electron microscopy (SEM), electron probe microanalysis (EPMA), atomic force microscopy (AFM), high resolution optical microscopy, surface profilometry, Fourier transform infrared spectroscopy (FTIR) and x-ray diffraction (XRD). Power spectral density (PSD) spectra computed from AFM data gives further insight into the effect of laser melting on the topography of the treated niobium. I owe my deepest gratitude to Dr. J. Michael Klopf from FEL team, who was beside me supporting my experiments. Any discussion I had with him has always been informative and helpful. Thanks for his encouragement and patience. He faced the challenge of a demanding student as I was. Eventually my progress will inspire many more research students to seek his fortunate advice and guidance. I wish to thank Dr. Shukui Zhang from FEL team for training and teaching me the laser system. I can never forget the timely help rendered by Dr. Gwyn Williams, Dr. Steve Benson, Dr. Jim Coleman, Cody Dickover, Chris Gould, Joe Gubeli, Kevin Jordan, Jim Kortze, Dan Sexton, Dr. Michelle Shinn, Dr. Richard Walker, Tom Powers and Guy Wilson, during my stay in FEL building by providing all the help I requested for.

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“…Also the intensity of the laser irradiation was too small to induce a gas breakdown, which needed a threshold irradiation of w br =3.0×10 7 J/mm 2 [17]. Even in the presence of a metal surface, which lowered this threshold by two orders of magnitude, no direct gas breakdown would evolve.…”

Section: A Comparison With Different Technologiesmentioning

confidence: 99%

Laser and Plasma Nitriding of Titanium in the Atmosphere Environment

Sun

2009

2009 Symposium on Photonics and Optoelectronics

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Laser nitriding is an attractive method to improve metal surface properties, such as hardness, wear, and corrosion resistance, with the advantage of simple experimental setup, rapid treatment, and precise process control. Here, titanium nitride was obtained in the atmosphere using a newly developed technique-a mixing technology of laser and plasma nitriding (LPN)-in order to enhance the titanium tribological properties. In addition to the experiments with LPN, also the results of the traditional technique of laser nitriding (LN) and a mixing technology of laser and pre-heated nitrogen (LHN) were presented. It has been shown that the LPN nitriding efficiency was better compared to LN and LHN. Moreover, the phase formation of titanium nitride was given at different laser energy densities with emphasis on the mixing technology with laser and plasma.

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Correlation among the laser-induced breakdown thresholds in solids, liquids, and gases

Cited by 47 publications

References 16 publications

Nitridation of iron by CW-CO2 laser nitriding technologies

Nitridation of iron by CW-CO2 laser nitriding technologies

Laser Processing of Metals and Polymers

Laser and Plasma Nitriding of Titanium in the Atmosphere Environment

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