Investigation of enhanced second harmonic generation in laser-induced air plasma
SY Fu, KJG Francis, MLP Chong, XC Zhang - arXiv preprint arXiv …, 2023 - arxiv.org
SY Fu, KJG Francis, MLP Chong, XC Zhang
arXiv preprint arXiv:2304.13264, 2023•arxiv.orgWe report a systematic investigation into the processes behind a near hundredfold
enhanced second harmonic wave generated from a laser-induced air plasma, by examining
the temporal dynamics of the frequency conversion processes, and the polarization of the
emitted second harmonic beam. Contrary to typical nonlinear optical processes, the
enhanced second harmonic generation efficiency is only observed within a sub-picosecond
time window and found to be nearly constant across fundamental pulse durations spanning …
enhanced second harmonic wave generated from a laser-induced air plasma, by examining
the temporal dynamics of the frequency conversion processes, and the polarization of the
emitted second harmonic beam. Contrary to typical nonlinear optical processes, the
enhanced second harmonic generation efficiency is only observed within a sub-picosecond
time window and found to be nearly constant across fundamental pulse durations spanning …
We report a systematic investigation into the processes behind a near hundredfold enhanced second harmonic wave generated from a laser-induced air plasma, by examining the temporal dynamics of the frequency conversion processes, and the polarization of the emitted second harmonic beam. Contrary to typical nonlinear optical processes, the enhanced second harmonic generation efficiency is only observed within a sub-picosecond time window and found to be nearly constant across fundamental pulse durations spanning from 0.1 ps to over 2 ps. We further demonstrate that with the adopted orthogonal pump-probe configuration, the polarization of second harmonic field exhibits a complex dependence on the polarization of both input fundamental beams, contrasting with most of the previous experiments with a single-beam geometry.
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