The temporal distribution of the spectral parametric gain was experimentally investigated\nwhen a chirped pump pulse was injected into a photonic crystal fiber. A pump-probe experiment\nwas developed and the important characteristics were measured as the chirp of the pump, the signal\npulse, and the gain of the parametric amplifier. We highlight that the amplified spectrum depends\nstrongly on the instantaneous pump wavelength and that the temporal evolution of the wavelength\nat maximum gain is not monotonic. This behavior is significantly different from the case in which the\nchirped pump has a constant peak power. This measurement will be very important to efficiently\ninclude parametric amplifiers in laser systems delivering ultra-short pulses.
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