Full Characterization of the 10 Fs NIR Pulses by a Dispersion Scan Measurement (IMAGE)
Caption
Hereby first the spectral phase of the pulses is varied (chirping) by inserting glass with gradually increasing thickness into the beam. Then in a thin nonlinear crystal the second harmonic of the chirped pulses is generated and its spectrum is recorded at the series of different glass insertions. In this way a two-dimensional trace is recorded (shown on the top left panel) from which the missing phase information can be extracted by using an iterative numerical algorithm. The simulated trace given by the phase-retrieval algorithm is shown in the top right panel exhibiting a striking similarity with the measured trace. The measured spectrum of the pulse together with the retrieved phase are shown in the bottom left panel, while their Fourier transform giving the pulse shape (red curve) is displayed bottom right. The black curve in this panel corresponds to the shortest possible pulse for the measured spectrum.
Credit
MBI
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