Study of x-ray emission enhancement via high contrast femtosecond laser interacting with solid foil

Details Study of x-ray emission enhancement via high contrast femtosecond laser interacting with solid foil Study of x-ray emission enhancement via high contrast femtosecond laser interacting with solid foil

2006-07-11

arxiv.org/abs/physics/0607091v1

Physics

Plasma Physics

16 pages, 4 figures, presented in 2006 APS March Meeting, Baltimore, MD. Session N43: Quantum Optics and Strong Field Physics,

Scientific paper

We studied the hard x-ray emission and the K-alpha x-ray conversion efficiency produced by 60 fs high contrast frequency doubled Ti: sapphire laser pulse focused on Cu foil target. Cu K-alpha photon emission obtained with second harmonic laser pulse is more intense than the case of fundamental laser pulse. The Cu K-alpha conversion efficiency shows strong dependence on laser nonlinearly skewed pulse shape and reaches the maximum value 4x10-4 with 100 fs negatively skewed pulse. It shows the electron spectrum shaping contribute to the increase of conversion efficiency. Particle-in-cell simulations demonstrates that the application of high contrast laser pulses will be an effective method to optimize the x-ray emission, via the Enhanced Vacuum Heating mechanism.

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