Study of x-ray emission enhancement via high contrast femtosecond laser interacting with solid foil
L. M. Chen, M. Kando, S. V. Bulanov, J. Koga, K. Nakajima, T. Tajima, M. H. Xu, X. H. Yuan, Y. T. Li, Q. L. Dong, J. Zhang
Abstract
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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