“…Also, OES assessment of the electron density in plasmas employed for harmonic generation has been reported for instance in [25], or even, in a reverse approach, harmonic generation has been employed as a measurement of electron density through OES in a quasi-phase matching configuration [30]. On the other hand, detailed analysis of optical emissions has shown to be an invaluable tool for the description of laser-induced plasmas [13], [31], [32], one that can not only provide information on a given parameter like electron density but that, particularly when performed with high spatial, temporal and spectral resolution, can yield valuable and precise information on a broad range of plasma characteristics like composition, excitation temperature, degree of ionization or plasma expansion behaviour. However, a detailed description of the features of the plasma through optical emission spectroscopy, together with the determination of their repercussions on harmonic generation, is, to our knowledge, lacking.…”