Dispersion Elimination Research On Ultrashort Pulse Measurement Based On The Method Of Grenouille

Ultrashort pulses with high peak intensity and temporal resolution are widely employed in science research,such as Medicine,Chemistry and Biology.In some fields,it is necessary to learn waveform and phase information of ultrashort pulses.So it is important to measure ultrashort pulses.Currently,there are disadvantages,such as high cost and difficult align,existing in measurement methods.GRENOUILLE measurement system which is simplified from FROG system can only measure sub-100 fs pulses due to existence of dispersive elements.In this dissertation,the propagation of pulse in GRENOUILLE system is studied and the effects of dispersive elements is eliminated by inversion of propagation of pulse.The work include the following aspects.Theory of GRENOUILLE and inversion algorithm are introduced.Secondly,the system parameters of GRENOUILLE are calculated and built the system.And then,the optical system for producing double pulses is built.GRENOUILLE system is celebrated by the developed method,which is independent on absolute time delay.The effect of different time sampling rates is investigated.The results show that the trace which has a shape of circular is benefit to inverse pulses.At last,based on Collins diffraction integration of time domain,the inversion Collins integration is derived.And a program for numeric calculation pulse inversion propagation based on Fast Fourier Transformation is designed.This program can eliminate the effect of dispersion.The effect of filtering parameter on reconstruction pulses is investigated.When the filtering parameter is equal to five,the constructed spectra is consistent with the measured spectra.In this study,effects of dispersive elements are eliminated from software without changing the advantage of GRENOUILLE.This study is benefit to ultrashort measurement.