Abstract The spectral and electrical diagnostics of plasmas generated by laser were performed by using the LIBS technique accompanied with simultaneous measurements of the electrical signal in the perturbations of an aluminum plasma laser, submerged in electric fields transverse to the direction of the beam laser produced by a parallel flat plates capacitor. In this paper, we show that temperature and electron density in the formed plasmas are directly proportional to the energy deposited by the beam laser on the sample. Depending on the separation of the plates, the analysis of the electrical signal shows that it decays approximately with the inverse of the squared distance and it also decays with the number of laser pulses for plasmas produced on the same region of the solid sample.