Figure 3

HHG spectra from two plasmas produced using the PS HP. Panels (a) and (b) correspond to SCP HHG in MA₂CuCl₄ LIP and MA₂CuBr₄ LIP respectively. TCP data are presented on the panels (c) HHG in MA₂CuCl₄ LIP and (d) HHG in MA₂CuBr₄ LIP. The harmonic spectra depending on the pulse duration and the sign of chirp are shown. Green filled profiles of harmonics correspond to the chirp-free 35 fs PP (Chirp-free, PD = 35 fs), red curves correspond to the positively chirped 70 fs PP (Chirp( +), PD = 70 fs), blue curves correspond to the negatively chirped 70 fs PP (Chirp(-), PD = 70 fs), black curves correspond to the positively chirped 130 fs PP (Chirp( +), PD = 130 fs), and purple curves correspond to the negatively chirped 130 fs PP (Chirp(-), PD = 130 fs).