Laser-based proton acceleration on ultrathin foil with a 100-TW-class high intensity laser system
2011
Focusing a high intensity laser pulse, onto a thin foil target generates a plasma and energetic proton and ion beams from
the target rear and front sides, propagating along the target normal. Such laser produced collimated and energetic protons
beams are of high interest because of the wide range of applications: ion based fast ignitor schemes, probing of
electromagnetic fields in plasma, isotopes production or hadron therapy. The 100 TW class laser system at the Advanced
Laser Light Source facility, is used with an intensity close to 10 19 W/cm 2 , to study protons acceleration with
femtosecond laser pulses, ultra thin foil target and high contrast laser pulse ratio. To characterize the plasma expansion,
we monitor it with an imaging technique using a femtosecond laser probe. In this configuration we were able to reach a
proton critical energy of 12 MeV and to work with target foil thickness as small as 15 nm.
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