Abstract
We have pushed the study of collective modes into the Ultracold Neutral Plasma (UCNP) regime by sculpting the initial density distribution through spatial modulation of the ionizing laser. With this technique, we have excited ion acoustic waves (IAW) and measured dispersion in the long wavelength limit [1]. Additionally, we have produced streaming plasmas and observed the evolution of a possible instability. A high resolution 1:1 optical relay allows ionization modulation on length scales of ~ 100 μm, comparable to the Debye shielding length, which will access linear and nonlinear phenomenon for which strong coupling is predicted to modify the properties of collective modes.
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