Ultrafast Science / 2022 / Article / Fig 3

Research Article

Factor 30 Pulse Compression by Hybrid Multipass Multiplate Spectral Broadening

Figure 3

(a) Comparison of simulated peak irradiances inside the MPC shown in Figure 2(a) for 100 J, 1250 fs Gaussian input pulses in case of linear (blue line) and nonlinear (red line) mode-matching. The crosses indicate the locations of the silica plates. Nonlinear mode-matching significantly reduces the maximal peak irradiance. Residual peak irradiance oscillations are caused by the approximations of our analytical model presented in supplement S2. Best mode-matching, i.e., smallest pass-to-pass beam area variation, is accomplished for 75 J input pulses according to (c). (b) Output spectra after 32 roundtrips corresponding to irradiance evolution from (a) and comparison to the input spectrum. (c) Simulated dependence of maximal peak irradiance in the Kerr media (I) on input pulse energy (E) for a nonlinear mode-matching point of about 75 J where I/E reaches its minimum. The monotonic increase of I obviates the need for modifying the input beam during energy ramp-up in a nonlinear mode-matching setting.