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We report a switchable time-varying mirror, composed of an ITO-Au stack,which can be efficiently modulated in time with over a ten-fold increase inreflectivity, with a change of 0.6. Upon interacting with the time-varyingmirror, the frequency content of a reflected pulse is extended to 31 THz. Thisoriginates from the shortening of the response time of the mirror beyondsaturation, as confirmed by a time-varying model and by further four-wavemixing experiments. A temporal response unbounded by the pump bandwidth opensnew avenues for spectral manipulation from time-varying systems with impact forcommunication networks, optical switching and computing.  We report a switchable time-varying mirror, composed of an ITO-Au bilayer,displaying a ten-fold modulation of reflectivity ($\Delta R \approx 0.6$),which saturates for a driving pump intensity $I_{\mathrm{pump}}\approx100$~GW/cm$^2$. Upon interacting with the saturated time-varying mirror, thefrequency content of a reflected pulse is extended up to 31 THz, well beyondthe pump spectral content (2.8 THz). We interpret the spectral broadening as aprogressive shortening of the mirror rise time from 110 fs to sub 30 fs withincreasing pump power, which is confirmed by four-wave mixing experiments andpartially captured by a linear time-varying model of the mirror. A temporalresponse unbounded by the pump bandwidth opens new avenues for spectralmanipulation from time-varying systems with impact for communication networks,optical switching and computing.

Saturable time-varying mirror based on an ENZ material