Accession Number : ADA323264

Title :   AASERT-92 Grant 'X-Rays from High-Intensity, Short-Pulse Interactions'.

Descriptive Note : Final rept. 1 Jun 93-30 Sep 96,

Corporate Author : CALIFORNIA UNIV BERKELEY

Personal Author(s) : Falcone, Roger W.

PDF Url : ADA323264

Report Date : SEP 1996

Pagination or Media Count : 5

Abstract : We demonstrated a novel sources of pulsed terahertz radiation and x rays which have ultrashort pulse duration and high intensity; this source is based on emission from ultrashort, laser heated gases and solids. We have examined the propagation of high intensity (up to 1019 W/cm2) ultrashort (100 fs) laser pulses in dense gases; this work has application to variety of studies involving high power laser pulses such as harmonic generation x ray lasers and laser wakefield accelerators. We studied schemes for new x ray lasers. They involve rapid recombination of highly ionized atoms (produced by multiphoton ionization) bellowed by lasing on Ly-alpha x-ray transitions. We developed a new Thomson scattering technique using multiple, ultrashort laser pulses; these studies were done in multiphoton ionized plasmas of interest to the construction of new x ray lasers. We have examined conditions for pumping recombination x-ray lasers using multiphoton ionized -gases. We have examined the non-Maxwellian energy distributions in multi photon ionized gases. Finally, we examined both the coherent and incoherent emission from short pulse laser excited clusters. This latest work has established that sub-wavelength sized clusters can be a source of intense plasma emission. and that the clusters are a source of harmonics from laser matter interaction.

Descriptors :   *PULSED LASERS, *X RAY LASERS, LASER PUMPING, PLASMAS(PHYSICS), RECOMBINATION REACTIONS, PHOTOIONIZATION, MAXWELLS EQUATIONS, IONIZED GASES, DENSE GASES.

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE