Optical Metrology of Ultrashort Pulses Based on Self-Phase Modulated Spectra Measurements

We demonstrate a simple fiber-implemented technique for retrieval of intensity profile and phase of ultrashort laser pulses based on processing only pulse spectrum and two self-phase modulated spectra measured after a short piece of optical fiber with Kerr nonlinearity. A Gerchberg-Saxton-like algorithm is used for processing the experimental data. The results obtained by the developed method of optical metrology are confirmed by independent FROG-measurements.