Patent ID: 6734976
Filing Date: 2004-05-11
Classification: G01J

Abstract:
A method for measuring an ultrashort optical pulse, comprising:generating a third-harmonic-generation (THG) signal with three fundamental frequency photon contributed from three different split pulses of the ultrashort optical pulse having time delays &tgr;1 and &tgr;2 in between; detecting the intensity of the THG signal while varying the time delays &tgr;1 and &tgr;2 between the split pulses to obtain a triple correlation of the ultrashort optical pulse; obtaining the magnitude |&Itilde;(&ngr;)| of the ultrashort optical pulse intensity in the frequency domain using the Fourier transform of the triple correlation; obtaining the phase &agr;(&ngr;) of the ultrashort optical pulse in the frequency domain using the triple correlation; and determining the intensity of the ultrashort optical pulse in the time domain I(t) using the magnitude |&Itilde;(&ngr;)| and the phase &agr;(&ngr;).