We present the first subpicosecond time-resolved temperature measurements of plasmas produced by high-intensity optical ionization. Thomson scattering is used to measure electron and ion temperatures of helium plasmas created by 125 fs, 800 nm laser pulses focused to an intensity of 2 × 1017 W/cm2. We find that the electron temperature is accurately predicted by a tunneling ionization model. The measured ion temperature is consistent with direct heating by the laser pulse.
© 1994 American Physical Society
T.E. Glover, T.D. Donnelly, E.A. Lipman, A. Sullivan, R.W. Falcone, "Subpicosecond Thomson Scattering Measurements of Optically Ionized Helium Plasmas," Phys. Rev. Lett. 73, 78 (1994). doi: 10.1103/PhysRevLett.73.78