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(a) Schematic energy diagram. The frequency of the probe beam is resonant with the cavity. The pump frequency is tuned such that the sum of pump and probe energies are less than the energy gap of GaAs to avoid two-photon absorption. (b) Schematic of the setup. The probe-beam path is shown in dark, the pump-beam path in light color.
Transient reflectivity vs frequency spectra for three different delay times, (triangles), (circles), and (squares). We observe an ultrafast shift in the cavity resonance (ticks) to lower frequencies and back to its original frequency.
(Upper panel) Measured (open symbols) and modeled (line) resonance frequency vs pump-probe delay. The pump frequency is at . The resonance frequency reaches its maximum shift at −0.2 ps and quickly returns to its unswitched value. The model matches the experiment well. The inset shows no switch when the pump frequency is at for comparison. (Lower panel) Transient reflectivity vs pump-probe delay at the cold cavity resonance frequency. The transient reflectivity shows similar reversible behavior as the resonance.
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