Recent laser-plasma interaction experiments at LLL

<正>In order to drive laser fusion targets in an ablative mode instead of an exploding-pushermode, longer pulse lengths and perhaps shorter laser wavelengths are desireable. Recentexperiments at Livermore are aimed at studying laser-plasma interaction issues using longerpulse lengths (0.6—2 ns); also, for better laser-target coupling, experiments at frequencydoubled light have been conducted.The issues under consideration are absorption of laser light into the plasma, transportof heat into dense material, scattering of laser light at the underdense plasma, and supra-thermal electrons which can cause target preheat; however, hot-electron production canbe reduced by using shorter laser wavelengths.