Fig. 3: Experimental and simulated probe spectra at λ0 = 1235 nm.
From: Broadband frequency translation through time refraction in an epsilon-near-zero material
a–c Experimental probe spectra as a function of the pump-probe delay time for varying pump intensities. The spectral magnitude for each pump-probe delay is normalized individually. d–f The corresponding numerically simulated probe spectra modeled by the nonlinear Schrödinger equation. The spectra of the probe show a strong dependence on the pump intensity and pump-probe delay time. For a pump intensity of 268 GW cm−2, the total frequency translation at this wavelength is 10.8 THz.
