Experimental results for high intensity KrF laser/plasma interaction

We report on KrF laser-plasma interaction studies at focused intensities up to 4 x 10 14 W/cm 2 for pulse durations of 1-2 ns and up to 10 15 W/cm 2 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/X has been measured in detail as a function of intensity, target Z, and angle of incidence 0 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 shortpulse experiments, we report on X-ray conversion measurements for 100-ps laser-irradiated targets of varying Z at laser intensities of 1.5 X 10 14 and 10 15 W/cm 2 . In particular, it is shown that higher laser intensity leads to a substantial increase in X-ray conversion efficiency.

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KrF laser-plasma interaction experiments with ns and ps pulses

Offenberger

Fedosejevs

Fujita

et al. 1992

Laser Part. Beams

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KrF laser produced plasmas

Offenberger

Fedosejevs

1989

Laser Part. Beams

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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 10 n -10 14 W/cm 2 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 \ /zm 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.

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Stimulated scattering from laser produced plasma

Offenberger¹,

Santiago²,

Fujita³

et al. 1990

Laser Part. Beams

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Stimulated Brillouin and Raman scattering are of considerable interest because of their importance to basic nonlinear plasma physics phenomena and to laser-driven inertial confinement fusion. Induced scattering can be substantial for high intensity (/), long wavelength (X) lasers because the instability growth rates depend exponentially on /X 2 , and also for short wavelength, long scalelength (L) laser/plasma interaction because of nearly homogeneous or large convective gain conditions. Experimental results from both KrF and CO 2 laser/plasma interaction studies are presented to illustrate important wavelength dependent features of induced scattering such as the nature of the instability (absolute, convective), threshold, spectra, reflectivity and saturation effects. Backscattering characteristics have been measured for solid target plasmas (aluminum, gold) produced by KrF laser pulses focused to intensities <10 14 W/cm 2 and gas targets (hydrogen, oxygen) by CO 2 laser pulses at intensities <10 13 W/cm 2 . Collisional absorption dominates the KrF laser experiments, whereas particle heating and increased Landau damping dominate the CO 2 laser experiments. Current theoretical work concerned with nonlinear effects in Langmuir wave localization, wave collapse and particle heating (generating characteristic high temperature electrons) is also presented.

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Experimental results for high intensity KrF laser/plasma interaction

Cited by 10 publications

References 20 publications

KrF laser-plasma interaction experiments with ns and ps pulses

KrF laser-plasma interaction experiments with ns and ps pulses

KrF laser produced plasmas

Stimulated scattering from laser produced plasma

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