The real world embraces nonlinearity and disorder and works with their mutual interplay. All the natural and artificial bodies are nonlinear and disordered, especially in the interaction with strong fields, the pivotal topic of this thesis. Here, we will explore several features of this interplay: we will discuss new intriguing phenomena (like the use of nonlinearity to control the stability of light localizations, the emission through two-levels laser action, the first observation of competitive laser spectra by granular media, etc.), that open up novel avenues for research in several fields, from medical imaging to nonlinear optics. In this preface, we give an overview about these two mechanisms, with special emphasis on localization phenomena.
KeywordsSolitary Wave Random Laser Resonant Medium Light Localization Artificial Body
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