Measurement of ultrashort laser pulses using the Second-Harmonic Generation Frequency-Resolved Optical-Gating: Characterization of an ultrashort laser pulse

Communication technologies are continuosly evolving since were invented the telegraph. Nowadays, one of the most interesting and relatively youngest field of telecommunications are the optical communications. The search of the shortest event ever created to measure very fast/short events is now possible because of the Light Amplification by Stimulated Emission of Radiation, longer known as laser.So well, we need to find the shortest event but we need to know how to measure it, since it is supposed that there is not a shorter event. So we need the pulse to measure itself, and its sound as we need to do a kind of autocorrelation.In order to measure a pulse, we need to get its intensity and phase in either the time or frequency domains. And, before the Frequency-Resolved Optical-Gating appearance, it was done with autocorrelation (time-domain) and spectrum (frequency-domain)