Natural SciencesPhysicsOpticsPhotonicsPropagationElectromagnetic WavesNonlinear Optical MaterialsNonlinear OpticsPhysical OpticsWave OpticsWave PropagationKerr NonlinearityNonlinear Light-tissue InteractionsNonlinear Optical PropagationNonlinear PropagationNonlinear Wave OpticsNonlinear Wave PropagationSelf-focusing