scholarly journals Experimental results for high intensity KrF laser/plasma interaction

1986 ◽  
Vol 4 (3-4) ◽  
pp. 329-348 ◽  
Author(s):  
A. A. Offenberger ◽  
R. Fedosejevs ◽  
P. D. Gupta ◽  
R. Popil ◽  
Y. Y. Tsui
Keyword(s):  
Laser Plasma ◽  
Brillouin Scattering ◽  
Laser System ◽  
Experimental Results ◽  
Stimulated Scattering ◽  
Plasma Interaction ◽  
X Ray ◽  
Laser Plasma Interaction ◽  
Incident Laser Pulse ◽  
Krf Laser

A high power KrF laser system employing beam multiplexing and stimulated Raman or Brillouin scattering to produce pulses as short as 1 ns and focused intensities on target of 1011 to 1014 W/cm2 has been developed for laser/plasma interaction research. A variety of investigations have been pursued on single and multilayer targets with variable atomic numbers. Absorption, transport, X-ray conversion, ion expansion characteristics, mass ablation and ablation pressure scaling, and stimulated scattering instabilities are among features that have been studied as a function of laser intensity. A wide variety of laser and target diagnostics are employed including focal plane imaging cameras for energy distribution and UV and soft X-ray streak cameras for temporally resolving the incident laser pulse and X-ray emission. Experimental results will be presented and our current understanding of the KrF laser/plasma interaction will be discussed.

scholarly journals KrF laser-plasma interaction experiments with ns and ps pulses

1992 ◽  
Vol 10 (4) ◽  
pp. 661-675
Author(s):  
A. A. Offenberger ◽  
R. Fedosejevs ◽  
M. Fujita ◽  
Y.-Y. Tsui ◽  
J. N. Broughton
Keyword(s):  
Laser Plasma ◽  
Brillouin Scattering ◽  
Short Pulse ◽  
Inhomogeneous Plasma ◽  
Angle Of Incidence ◽  
Plasma Interaction ◽  
X Ray ◽  
Laser Plasma Interaction ◽  
Krf Laser ◽  
Hydrodynamic Calculations

We report on KrF laser-plasma interaction studies at focused intensities up to 4 × 1014 W/cm2 for pulse durations of 1–2 ns and up to 1015 W/cm2 for pulse duration of 100 ps. The longer-pulse experiments are concerned with quantifying two important features of the ablating plasma. Stimulated Brillouin scattering at moderately large L/λ has been measured in detail as a function of intensity, target Z, and angle of incidence θ to compare with modeling calculations of backscatter in inhomogeneous plasma. In addition, electrodynamic charge analyzer measurements have been made for varying intensity and target Z to compare with hydrodynamic calculations of ion expansion and recombination. In the short-pulse experiments, we report on X-ray conversion measurements for 100-ps laser-irradiated targets of varying Z at laser intensities of 1·5 × 1014 and 1015 W/cm2. In particular, it is shown that higher laser intensity leads to a substantial increase in X-ray conversion efficiency.

Temperature and x‐ray intensity scaling in KrF laser plasma interaction

1986 ◽  
Vol 48 (2) ◽  
pp. 103-105 ◽  
Author(s):  
P. D. Gupta ◽  
R. Popil ◽  
R. Fedosejevs ◽  
A. A. Offenberger ◽  
D. Salzmann ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Plasma Interaction ◽  
X Ray ◽  
Laser Plasma Interaction ◽  
Krf Laser ◽  
Intensity Scaling

scholarly journals Bandwidth effects on laser–plasma interaction with a ¼-μm laser

1993 ◽  
Vol 11 (1) ◽  
pp. 15-23 ◽  
Author(s):  
H. Yoneda ◽  
T. Miura ◽  
Y. Yokota ◽  
Y. Motoki ◽  
A. Sasaki ◽  
...  
Keyword(s):  
Theoretical Prediction ◽  
Laser Plasma ◽  
Brillouin Scattering ◽  
Fluid Simulation ◽  
Experimental Results ◽  
Simulation Code ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Broadband Laser ◽  
Stimulated Brillouin

Bandwidth effects on laser-plasma interaction were investigated with a ¼-μm laser. Planar targets were irradiated with a 1- to 40-cm–1 bandwidth laser at I = 1 × 1013–4 × 1015 W/cm2. Above 3 × 1013 W/cm2, stimulated Brillouin scattering (SBS) was observed with 1 cm–1 light. This process was strongly reduced with a 40-cm–1 light. Evolution of the convective SBS was studied with 1-D fluid simulation code. Bandwidth effect on the SBS growth was discussed to compare the theoretical prediction and experimental results. The scalelength dependence exists for the SBS reduction with a broadband laser.

scholarly journals KrF laser produced plasmas

1989 ◽  
Vol 7 (3) ◽  
pp. 393-403 ◽  
Author(s):  
A. A. Offenberger ◽  
R. Fedosejevs
Keyword(s):  
High Efficiency ◽  
Laser Energy ◽  
Brillouin Scattering ◽  
Laser System ◽  
Paper Briefly ◽  
Stimulated Scattering ◽  
Laser Plasma Interaction ◽  
Dense Plasmas ◽  
Krf Laser ◽  
Stimulated Brillouin

KrF and other short wavelength lasers are ideal candidates for producing hot dense plasmas since the laser energy can be absorbed with high efficiency by classical mechanisms, thereby virtually eliminating anomalous absorption and the production of non-thermal electrons. A high power KrF laser system employing optical beam multiplexing and stimulated Brillouin scattering to produce pulses as short as 1 ns and focused intensities on target of 1011−1014 W/cm2 has been developed for producing such plasmas and studying laser/plasma interaction phenomena. A variety of studies on absorption, transport, ablation, X-ray conversion and stimulated scattering instabilities have been pursued with this ¼ μm laser on single atomic number and multi-layer targets. This paper briefly describes some of the features of the KrF laser system and highlights some of the characteristics of the hot dense plasmas produced.

scholarly journals Particle and x−ray energy measurements in laser‐plasma interaction experiments

1978 ◽  
Vol 49 (1) ◽  
pp. 132-137 ◽  
Author(s):  
V. C. Rupert ◽  
S. R. Gunn ◽  
J. F. Holzrichter
Keyword(s):  
Laser Plasma ◽  
Plasma Interaction ◽  
X Ray ◽  
Laser Plasma Interaction

scholarly journals Novel scintillator-based x-ray spectrometer for use on high repetition laser plasma interaction experiments

2018 ◽  
Vol 89 (7) ◽  
pp. 073502 ◽  
Author(s):  
D. R. Rusby ◽  
C. D. Armstrong ◽  
C. M. Brenner ◽  
R. J. Clarke ◽  
P. McKenna ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Plasma Interaction ◽  
X Ray ◽  
Laser Plasma Interaction ◽  
High Repetition

Controlling energy distribution of fast ions and X-ray emission via target reliefs in ultrafast and relativistic laser plasma interaction

2019 ◽  
Vol 26 (11) ◽  
pp. 113110 ◽  
Author(s):  
A. A. Andreev ◽  
M. V. Sedov ◽  
K. Y. Platonov ◽  
A. Lübcke ◽  
M. Schnürer
Keyword(s):  
Energy Distribution ◽  
Laser Plasma ◽  
Plasma Interaction ◽  
X Ray ◽  
Laser Plasma Interaction ◽  
Fast Ions
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