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Plasmas with anisotropic electron velocity distribution functions are neededfor the controlled study of kinetic plasma instabilities in the laboratory. Wedemonstrate that such plasma can be produced using ultrashort laser pulses viaoptical-field ionization (OFI). We experimentally show this control by usingThomson scattering as a diagnostic to probe the characteristic electronvelocity distributions using linearly and circularly polarized laser pulses toionize helium. Furthermore the He plasma produced by a circularly polarizedlight pulse exhibits the onset of the electron streaming instability within 300fs of ionization, demonstrating applicability of OFI generated plasmas forstudying the kinetic theory regime of plasma physics.

Initializing anisotropic and unstable electron velocity distributions needed for investigating plasma kinetic instabilities