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 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 Laser–plasma-interaction experiments using multikilojoule lasers

1988 ◽  
Vol 6 (2) ◽  
pp. 235-244 ◽  
Author(s):  
R. Paul Drake
Keyword(s):  
Laser Plasma ◽  
Stimulated Raman Scattering ◽  
Brillouin Scattering ◽  
High Gain ◽  
Laser Wavelength ◽  
Laser Fusion ◽  
Incident Laser ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Stimulated Brillouin

This paper summarizes the results of several laser–plasma-interaction experiments using multikilojoule lasers, and considers their implications for laser fusion. The experiments used 1·06-, 0·53-, 0·35-, and 0·26-μm light to produce relatively large, warm, planar plasmas and to study the effect of laser wavelength and density-gradient scale length on the Stimulated Raman Scattering and on the scattering of light at frequencies near the incident laser frequencey by Stimulated Brillouin Scattering or other processes. The results of these experiments suggest that some laser wavelength between 0·2 and 0·6 μm will be required for high-gain laser fusion.

Saturation of Stimulated Brillouin Backscatter in CO2-Laser-Plasma Interaction

1979 ◽  
Vol 42 (5) ◽  
pp. 307-311 ◽  
Author(s):  
A. Ng ◽  
L. Pitt ◽  
D. Salzmann ◽  
A. A. Offenberger
Keyword(s):  
Co2 Laser ◽  
Laser Plasma ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Stimulated Brillouin

scholarly journals Modification of stimulated Brillouin scattering due to magnetic anisotropy in laser–plasma interaction

1998 ◽  
Vol 16 (3) ◽  
pp. 491-501 ◽  
Author(s):  
M. Khan ◽  
S. Sarkar ◽  
T. Desai ◽  
H.C. Pant
Keyword(s):  
Magnetic Anisotropy ◽  
Laser Plasma ◽  
Brillouin Scattering ◽  
Stimulated Brillouin Scattering ◽  
Wave Number ◽  
Laser Fusion ◽  
Laser Plasma Interaction ◽  
Inverse Faraday Effect ◽  
Phase Velocities ◽  
Stimulated Brillouin

Laser plasma experiments reveal rich interplay between laser plasma instabilities. The growth of stimulated Brillouin scattering (SBS) is one of the most significant constraints of laser fusion experiments. In this paper, a mechanism of stabilization of SBS process due to magnetic anisotropy has been presented. Magnetic anisotropy induced by the temporally exponentially growing nonoscillating magnetic moment from inverse Faraday effect (IFE) has been studied.It has been shown that for interaction of Nd laser (λ = 1.06 μm) on solid deuterium target the SBS growth rate (y) ∼ 3.45 ps and the phase velocities of the incident and scattered electromagnetic (EM) waves have been shown to decay exponentially (∼e∼λ1) in this SBS process resulting in wave-number mismatch.

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.

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