Optics and Photonics Society of Iran

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Attosecond extreme ultraviolet pulses open a way to study basic ultrafast electronic processes in atoms and molecules with unprecedented precision. The relativistic Weibel instability and temperature anisotropy can generate electron bunches of attosecond duration that makes it an attractive method for the generation and amplification of tunable ultrashort pulses. In this paper, the relativistic effect and temperature anisotropy upon generating attosecond electron bunches is investigated. Calculations show that with reduction relativistic parameter, g by a factor of 2 and increasing 14.6% of the relativistic Weibel instability growth rate leads to about 62% reduction of the nanobunching gain saturation time and the density perturbation generated by the temperature anisotropy and the Weibel instability. The nanobunching density perturbation has a maximum value corresponding to 2.12×10³⁷ for wavenumber kc/ω_pe=1.33 and g=3. Evidence of ultrashort electron bunches could be applied to attosecond electron and coherent x-ray production.
 

Keywords: Attosecond Pulse, Electron Nanobunch, Temperature Anisotropy, Relativistic Parameter.

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