- Conference date: 22-25 April 2002
- Location: Gatlinburg, Tennessee (USA)
The success in building ultrashort pulse lasers capable of delivering higher and higher intensities have pushed laser‐solid interaction experiments into a new regime where v os /c approaches 1. We have performed experiments to study the K‐shell aluminum emission spectra from thin foils heated with an ultrashort pulse laser. The foils are illuminated at an intensity of 1 × 1019 W/cm2. After heating, minimal radiation cooling and longitudinal heat conduction occur due to the targets’ low atomic number and thickness, allowing hydrodynamic expansion to dominate the cooling process and simplifying the analysis. The time resolved Helium like 1s2‐1s2p(1P) (Heα), 1s2‐1s3p(1P) (Heβ), and 1s2‐1s4p(1P) (Heγ) spectrum is collected with a 500 fs x‐ray steak camera interfaced to a two crystal von Hamös spectrograph. The spectra from these plasmas have shown interesting and unusual features. In particular, exotic satellites have been observed when high intensity ultrashort pulse lasers interact with solids. The satellite emission brightness relative to the resonance lines suggest an expectedly large fraction of Li‐like, Be‐like, and B‐like ions. An electron beam generated in the field of the laser is offered as an explanation of the observed satellite emission.
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