The astonishing non linear optical properties of solutions of polyisoprene and polybutadiene in various organic solvents are reviewed: When irradiated with mild laser light, the non absorbing solutions respond by a change of the local polymer concentration inducing a local variation of the refractive index that alters the light propagation. Observed formations include optical spatial soliton‐like filaments, multi‐filaments arrays resulting from modulational instabilities, multi‐filament holographic gratings or even more complex structures.

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