Dynamics of laser-cluster interaction probed by X-ray spectroscopy - Archive ouverte HAL
Communication Dans Un Congrès Année : 2005

Dynamics of laser-cluster interaction probed by X-ray spectroscopy

Dominique Vernhet

Résumé

Interaction of high intensity ultrashort laser pulses with matter has received considerable attention in the last few years. With clusters in intense optical fields (F > 109 V/cm), the energy coupling between radiation and matter is extremely efficient, providing specific features that are not observed when atoms, small molecules or even solid are used as targets : multicharged ions reaching the MeV, hot electrons up to few keV and keV x-ray photons are produced in the laser heated cluster plasma. Here, we focus on the x-ray generation related to the production of highly stripped and excited ions. We study deexcitation of species from Ar12+ to Ar16+ with K vacancy for Ar clusters and from Xe24+ to Xe34+ with L vacancies for Xe clusters. The goal is to understand how electrons initially produced by Optical Field Ionisation (OFI) can reach enough energy to generate a strong production of ions with inner shell vacancies. We have performed quantitative studies(*) on the evolution of absolute photon emission yields and complete charge state distributions with different physical parameters governing the interaction ; namely intensity, polarization, pulse duration and wavelength of the laser, size and atomic number of the clusters. KeV x-rays are studied from rare-gas clusters irradiated with intense (I ~ 1014–1018 W cm-2) infrared and blue laser pulses of 50 – 2000 fs duration. Our measurements show evidence for an unexpectedly low laser intensity threshold: ~ 3 1015 W/cm2 at 60 fs and ~ 3 1014 W/cm2 at 610 fs. The set of data and the behavior of x-ray yields with the physical parameters explored will be presented and discussed in the light of new theoretical developments. (*) Experiments are performed on the LUCA (Laser Ultra Court Accordable) in Saclay, France.
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Dates et versions

hal-00017361 , version 1 (19-01-2006)

Identifiants

  • HAL Id : hal-00017361 , version 1

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Dominique Vernhet. Dynamics of laser-cluster interaction probed by X-ray spectroscopy. Workshop on Recent advances on the dynamics of atomic and molecular particles interacting with gas and solid targets, Oct 2005, Donastia-San Sebastian,, Spain. ⟨hal-00017361⟩
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