Fig. 6: Calculated PM efficiency as a function of pump and seed laser wavelengths, the temporal overlap between the pump and seed laser pulses, simulated final output spectrum and corresponding TL pulse duration.
From: Dual-chirped optical parametric amplification of high-energy single-cycle laser pulses
a, PM efficiency combining type-I BiBO and type-I MgO:LiNbO3 crystals. The black dashed, solid and dotted lines (slopes (∆λpump/∆λseed) of 0.038 by linear fitting) represent the wavelengths of the chirped seed laser pulse and the corresponding pump laser pulse for the BiBO and MgO:LiNbO3 crystals, respectively. b, Temporal overlap between the pump and seed laser pulses corresponding to the chirp matching in a. The left and right axes represent the wavelengths and normalized peak powers, respectively, corresponding to each moment in the time domain (bottom axis). The red-shaded region represents the intensity profile (right axis) of the chirped seed laser pulse in the time domain, and the red curve shows the change in wavelength (left axis) of the chirped seed laser pulse in the time domain. The black curves show the intensity profile (right axis) and change in wavelength (left axis) of the chirped pump laser pulse in the time domain to realize the chirp-matching condition in the first MgO:LiNbO3 crystal shown in a. The grey curves show the intensity profile (right axis) and change in wavelength (left axis) of the chirped pump laser pulse in the time domain to realize the chirp-matching condition in the second MgO:LiNbO3 crystal shown in a. The blue curves show the intensity profile (right axis) and change in wavelength (left axis) of the chirped pump laser pulse in the time domain to realize the chirp-matching condition in the BiBO crystal shown in a. c, Simulated final output spectrum of the designed sub-cycle MIR laser system. d, Corresponding TL pulse duration of the spectrum shown in c.
