Experimental mathematical model of nanosecond laser interaction with material

J. Martan; J. Kunes; N. Semmar

doi:10.1016/j.apsusc.2006.07.059

Au-Cluster Redistribution During Nanosecond Laser-Annealing of Metal/Insulator Matrices

MRS Proceedings ◽

10.1557/proc-51-309 ◽

1985 ◽

Vol 51 ◽

Author(s):

W. Pamler ◽

E. E. Marinero ◽

M. Chen ◽

V. B. Jipson

Keyword(s):

Laser Annealing ◽

Depth Profiling ◽

Nanosecond Laser ◽

Laser Interaction ◽

X Ray Diffraction ◽

Metal Insulator ◽

Time Resolved ◽

Au Clusters ◽

Excimer Laser Radiation ◽

Compositional Changes

ABSTRACTWe report on the growth and redistribution of Au clusters caused by nanosecond laser interaction of Aux(TeO2 )1−x thin films with intense excimer laser radiation. This laser-induced phenomenon is studied in a time-resolved manner using transient reflectivity and transmissivity techniques. Structural and compositional changes are investigated using Rutherford Backscattering, XPS depth profiling, x-ray diffraction and conductivity measurements. Our studies indicate that melting of the binary structure initializes segregation, growth and coalescence of Au crystallites in the amorphous TeO2 matrix.

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Smoothing and stochastic pulsation at high power laser-plasma interaction

Laser and Particle Beams ◽

10.1017/s0263034606060617 ◽

2006 ◽

Vol 24 (3) ◽

pp. 455-463 ◽

Cited By ~ 19

Author(s):

HEINRICH HORA

Keyword(s):

Laser Plasma ◽

Laser Pulses ◽

State Density ◽

Nanosecond Laser ◽

Laser Interaction ◽

Plasma Interaction ◽

Laser Plasma Interaction ◽

Recent Developments ◽

Nanosecond Laser Pulses ◽

And Control

Stochastic pulsation of laser-plasma interaction in the range of a few to dozens of picoseconds, due to standing wave produced density ripples, needs more attention than in the past, in view of the recent developments. This is important if nanosecond laser pulses produce a pre-compression that is a thousand times the solid state density of DT for fast ignition as well as for treatment of ps laser interaction. The following is an updated summary of these properties where the laser beam smoothing is essential. The use of smoothing is not only an empirical game with experiments for improving the interaction, but it is necessary to be aware of the mechanisms involved for understanding how the pulsation is overcome, and conclusions can be derived systematically for further improvements and control of the phenomena.

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MeV bremsstrahlung X rays from intense laser interaction with solid foils

Laser and Particle Beams ◽

10.1017/s0263034618000551 ◽

2018 ◽

Vol 36 (4) ◽

pp. 502-506 ◽

Cited By ~ 5

Author(s):

S. Palaniyappan ◽

D. C. Gautier ◽

B. J. Tobias ◽

J. C. Fernandez ◽

J. Mendez ◽

...

Keyword(s):

Thin Foil ◽

Intense Laser ◽

Nanosecond Laser ◽

Nuclear Materials ◽

X Rays ◽

Laser Interaction ◽

Incident Laser ◽

X Ray ◽

Order Of Magnitude ◽

Fs Laser

AbstractLaser-based compact MeV X-ray sources are useful for a variety of applications such as radiography and active interrogation of nuclear materials. MeV X rays are typically generated by impinging the intense laser onto ~mm-thick high-Z foil. Here, we have characterized such a MeV X-ray source from 120 TW (80 J, 650 fs) laser interaction with a 1 mm-thick tantalum foil. Our measurements show X-ray temperature of 2.5 MeV, flux of 3 × 1012 photons/sr/shot, beam divergence of ~0.1 sr, conversion efficiency of ~1%, that is, ~1 J of MeV X rays out of 80 J incident laser, and source size of 80 m. Our measurement also shows that MeV X-ray yield and temperature is largely insensitive to nanosecond laser contrasts up to 10−5. Also, preliminary measurements of similar MeV X-ray source using a double-foil scheme, where the laser-driven hot electrons from a thin foil undergoing relativistic transparency impinging onto a second high-Z converter foil separated by 50–400 m, show MeV X-ray yield more than an order of magnitude lower compared with the single-foil results.

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Fundamental difference between picosecond and nanosecond laser interaction with plasmas: Ultrahigh plasma block acceleration links with electron collective ion acceleration of ultra-thin foils

Laser and Particle Beams ◽

10.1017/s0263034611000784 ◽

2012 ◽

Vol 30 (2) ◽

pp. 325-328 ◽

Cited By ~ 20

Author(s):

Heinrich Hora

Keyword(s):

Laser Pulses ◽

Direct Conversion ◽

Nanosecond Laser ◽

Laser Interaction ◽

Mechanical Motion ◽

Ion Energy ◽

Thin Foils ◽

High Acceleration ◽

Ponderomotive Forces ◽

Fs Laser

AbstractArguments are discussed on how ion energy measurements from ultra-thin diamond irradiation with 45 fs laser pulses of 26 terawatt power may be related to the ultra-high acceleration of plasma blocks where the significance of the highly efficient direct conversion of laser radiation into mechanical motion of ions or plasma blocks is dominated by nonlinear (ponderomotive) forces in fundamental contrast to thermo-kinetic dominated interaction with ns laser pulses.

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