Results 271 to 280 of about 23,841 (308)

Nanosecond-to-femtosecond laser-induced breakdown in dielectrics

Physical Review B, 1996
We report extensive laser-induced damage threshold measurements on dielectric materials at wavelengths of 1053 and 526 nm for pulse durations $\ensuremath{\tau}$ ranging from 140 fs to 1 ns. Qualitative differences in the morphology of damage and a departure from the diffusion-dominated ${\ensuremath{\tau}}^{\frac{1}{2}}$ scaling of the damage fluence ...
, Stuart, , Feit, , Herman, , Rubenchik, , Shore, , Perry   +5 more
openaire   +2 more sources

Surface plasma influence on nanosecond laser ablation

Applied Optics, 2019
The comparison of laser ablation and plasma evolution has been carried out for a molten steel sample in the absence and in the presence of surface plasma. A continuous wave (cw) laser beam was utilized for local melting of a steel (Fe>99  wt.%) sample, but it also induced a surface plasma according to optical emission spectroscopy.
V. N. Lednev, P. A. Sdvizhenskii, R. D. Asyutin, M. Ya. Grishin, R. S. Tretyakov, S. M. Pershin   +5 more
openaire   +2 more sources

Fragmentation process induced by nanosecond laser pulses

Applied Physics Letters, 1992
A fiber-optic stress sensing technique is applied to evaluate the fragmentation mechanism induced by nanosecond laser pulses. We demonstrate that fragmentation is achieved in response to the shock induced by the laser initiated plasma expansion. This shock is followed by a second shock of similar magnitude observed some hundreds of microseconds later ...
Rink, K., Delacretaz, G., Salathe, R. P.
openaire   +1 more source

NANOSECOND PULSES FROM A HYDROGEN FLUORIDE LASER

Infrared Physics, 1976
Abstract A simple experimental setup for generating hydrogen fluoride laser pulses in the range from 25 to 3 nsec is presented. Dependence of pulse width and peak power upon laser gas pressure and mixture is discussed. Some details about the spectral resolved time behaviour of the multiline pulses (2.6–3.0μm) are given.
P. Schilling, G. Decker
openaire   +1 more source

Investigation of Wettability of Zirconia by Nanosecond Laser Treatment

2018 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO), 2018
This paper presents an investigation of wettability of zirconia by nanosecond laser treatment. Laser treatment of zirconia has been carried out for investigating the surface wettability with different processing parameters. Morphological and metallurgical modifications are examined in the laser treated layer by using scanning electron microscope (SEM ...
Jing, Xiubing, Yang, Chengjuan, Zheng, Shuxian, Chen, Xinxiong, Zhao, Yuechao   +4 more
openaire   +1 more source

Laser-induced transparency during nanosecond laser ablation

SPIE Proceedings, 2003
Steady state laser vaporization regime of condensed matter is investigated in the case of laser-induced transparency in irradiated target. Vaporization front stability problem is also considered taking into account bulk absorption in the target and different Mach number in evaporation plume.
S. N. Andreev, A. A. Samokhin, I. N. Kartashov, Vladimir I. Mazhukin, Dominique F. Grevey   +4 more
openaire   +1 more source

Nanosecond and femtosecond laser spectroscopy of molecules of biological interest

Applied Surface Science, 2007
This paper mainly concerns on nanosecond and femtosecond laser spectroscopy of aromatic organic compounds as neurotransmitters, and plume diagnostics of the ablated species, in order to characterize the plasma dynamics, i.e. the temporal and spatial evolution of the plume.
P Villani, S Orlando, A Santagata, A De Bonis, S Veronesi, A Giardini   +5 more
openaire   +3 more sources

Nanosecond laser micropatterning of optical fibers

SPIE Proceedings, 2011
Towards the development of new optical fiber sensors it was studied the application of nanosecond infrared laser radiation in the micropatterning of optical fibers. Nd:YAG laser pulses were focused on silica fibers by an apparatus projected to position the fiber regarding the laser beam and analyze the interaction. Experiments allowed determining the
Marta Nespereira, Catarina Silva, João M. P. Coelho, José M. Rebordão   +3 more
openaire   +1 more source

Emission of nanosecond laser plasma of gadolinium

Bulletin of the Lebedev Physics Institute, 2015
The results of the study of laser plasma generated by nanosecond laser radiation with controlled spatial coherence incident on various targets containing gadolinium are presented. X-ray radiation of such plasma is studied using an X-ray diagnostic system developed and fabricated by the authors.
A. A. Fronya, V. N. Puzyrev, A. N. Starodub, O. F. Yakushev   +3 more
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Nanosecond and picosecond laser desorption of C60

Synthetic Metals, 1996
Abstract Laser desorption of C 60 using nanosecond and picosecond laser pulses has been investigated. The velocity distributions of the desorbed ions were determined by means of time-of-flight mass spectrometry. Optical emission spectroscopy was used to determine the internal energy of the desorbed species.
E.E.B. Campbell, I.V. Hertel, Ch. Kusch, R. Mitzner, B. Winter   +4 more
openaire   +1 more source