Abstract

We investigate ultrashort-pulse interactions based on cascaded second-harmonic generation and difference-frequency generation and propose their use for frequency-resolved optical gating (FROG) at telecom wavelengths in a waveguide configuration. We show how a ${\chi }^{\left(2\right)}\text{–}{\chi }^{\left(2\right)}$ FROG device could allow the efficient characterization of ultrashort pulses, with time resolutions well beyond the limits normally imposed by walk-off effects on single-step ${\chi }^{\left(2\right)}$ FROG devices.

© 2005 Optical Society of America

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