Abstract
We have studied experimentally the angular and energy distribution of the suprathermal electrons produced during the interaction of a 120 fs, 50 mJ, 800 nm, $P$-polarized laser pulse on ${\mathrm{SiO}}_{2}$ targets. A sharply collimated jet of electrons is observed in the laser specular reflection direction, in the plane of incidence, superimposed to an angularly uniform electron distribution. Electron energies are $\ensuremath{\approx}20$ keV for a laser intensity of $4\ifmmode\times\else\texttimes\fi{}{10}^{16}$ W cm${}^{\ensuremath{-}2}$ and $45\ifmmode^\circ\else\textdegree\fi{}$ incidence angle. The electron jet is weaker and angularly broadened with the introduction of a laser prepulse controlling the electron density gradient scale length. Laser absorption and $K\ensuremath{\alpha}$ line intensity measurements show a maximum for a prepulse delay of $\ensuremath{\approx}6$ ps with an electron energy rising to $\ensuremath{\approx}180$ keV. Gradient scale length measurements at this prepulse delay fit the laser absorption peak scaling obtained from standard resonant absorption theory.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.