A high-power infrared pump beam can either improve or degrade the spatial quality of a co-propagating weak second-harmonic beam in a multimode fiber, and this power/coupling-controlled reshaping can also switch a visible Raman cascade on or off.
Induced focusing and spatial wave breaking from cross-phase modulation in a self-defocusing medium,
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Spatio-spectral light-by-light moulding in multimode fibre
A high-power infrared pump beam can either improve or degrade the spatial quality of a co-propagating weak second-harmonic beam in a multimode fiber, and this power/coupling-controlled reshaping can also switch a visible Raman cascade on or off.