Comparison of frequency-resolved optical polarization gating induced by molecular alignment and Kerr effects

Abstract

We experimentally demonstrated that both the electronic Kerr effect and the molecular alignment in gaseous molecules could be applied as transient gates to diagnose 400 nm target pulses. Their birefringence dissimilarity was clearly visualized by the measured spectrogram and retrieved gate function. In the atomic gas argon, a relatively weak and instantaneous cross phase modulation within the pulse duration was observed, while in the molecular gas N(2), the delayed rotational Raman excitation played a dominative role.

Femtosecond filamentation induced fluorescence technique for atmospheric sensing*

“…Nonlinear interaction of multiple infrared femtosecond filaments could generate plasma gratings [63][64][65][66][67][68][69][70][71][72][73][74][75] that may tolerate higher laser intensities beyond the clamped intensity limit. In this sense, new spectral lines might be generated due to the high-intensity-induced multiphoton absorption.…”