Measurement of the group-delay dispersion of a pulse stretcher-compressor system with two-dimensional spectral interferometry

In this work, we present a two-dimensional extension of the stationary phase point (SPP) method which is suitable for measuring the group-delay dispersion (GDD) of a stretcher or a compressor. The light path in the chirped-pulse amplification (CPA) laser is completed to form a Mach-Zehnder type interferometer, and only the stretcher is placed in the sample arm. The recombined pulses from the interferometer are sent to the entrance slit of an imaging spectrograph. The group delay as a function of wavelength can be determined from the position of the center of the spectrally resolved interference (SRI) fringes.