Cross-correlation frequency-resolved optical gating by molecular vibration for ultrashort pulse

The frequency-resolved optical gating (FROG) technique is one of the most popular and robust methods for ultrashort laser pulse characterization, which involves an experimental apparatus to create a spectrogram of a target pulse resulting from its convolution with a gate function and a retrieval algorithm. This paper propose cross-correlation frequency-resolved optical gating (XFROG) technology based on molecular vibration, which is not limited by the wavelengths, and also has high sensitivity for the measurement of the weak pulse. It was demonstrated that molecular-vibration-gated XFROG is a powerful technique for the measurement of ultrashort pulses and ultrafast molecular vibration. Since the molecular vibrational coherence time is from fs to ps, we can expect to measure different ultrashort pulse durations by choosing different Raman modes.