Abstract

We extend the technique of frequency-resolved optical gating^1,2 (FROG) to include the use of noninstantaneously responding optical nonlinearities. Most pulse-characterization schemes, such as second-harmonic- generation autocorrelation, rely on the use of a nonlinearity that responds on a much faster time scale than the pulse temporal width. Because slowly responding nonlinearities are generally stronger than quasi-instantaneous ones, the use of a more-slowly-responding nonlinearity would permit the measurement of weaker-intensity pulses.

© 1995 Optical Society of America