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We present a space and time resolved interferometric plasma diagnostic foruse on plasmas where neutral-bound electron contribution to the refractiveindex cannot be neglected. By recording simultaneously the plasma optical indexat 532 and 1064 nm, we are able to extract independently the neutral and freeelectron density profiles. We report a phase resolution of 30 mrad,corresponding to a maximum resolution on the order of$4\times10^{23}~\mathrm{m}^{-3}$ for the electron density, and of $10^{24} ~\mathrm{m}^{-3}$ for the neutral density. The interferometer is demonstrated oncentimeter-scale sparks triggered by laser filamentation in air with typicalcurrents of a few tens of A.

Two-color interferometer for the study of laser filamentation triggered electric discharges in air