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Ultrafast transmission changes after excitation by one pump pulse and by a pair of pump pulses separated by 1.0 and 2.5 ps. We can observe that for two pumps the baseline is higher than for only one, but the peak highness is the same in both cases. The chopper modulates the pump beam at 580 Hz.
Transient transmission signal without (continuous line) and with (closed circle) cw excitation.
(a) Baseline as a function of the chopper frequency. A linear fit adjusts very well the whole data. The pump beam power is 20 mW; (b) baseline as a function of pump pulse power. At high frequencies the baseline is zero independently of the pump power.
Ultrafast transmission changes after excitation by one pump pulse and by a pair of pump pulses separated by 500 fs, 1 ps, and 2.5 ps in a system free of thermal effects. Chopper frequency is 3.1 kHz.
Nonlinear refractive index, , response time, and figure of merit for different semiconductors quantum dots in doped glass.
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