D. Cheskis

Raman-induced localization in Kerr waveguide arrays.

We show that during the spatiotemporal compression in a periodic Kerr waveguide array, stimulated Raman scattering can effectively balance the effects of self-phase modulation, diffraction, and group-velocity dispersion, eliminating collapse and breakup over a wide range of input powers and leading to stable propagation in a single site.

Spatio-temporal Effects in Nonlinear Discrete Media

In this paper, we will introduce the concept of discrete solitons and we will discuss some of their spatio-temporal dynamics, which leads to interesting consequences in both the fundamental and the applied domain

Self-focusing and trapping of Raman-shifted pulses in periodic nonlinear waveguides

We present experimental studies and numerical simulations of pulse propagation in continuous and periodically-modulated nonlinear waveguides, in the anomalous dispersion regime. These reveal the complex dynamics ofthe beam trapping process in periodic structures.

Self-focusing, breakup, and trapping of Raman-shifted femtosecond pulses in homogeneous slab and weakly coupled arrays of nonlinear glass silica waveguides

We present experimental and numerical studies of pulse propagation in continuous and periodically modulated nonlinear waveguides, made of Silica glass. When intense femtosecond pulses are passed through this χ3 material, a positive Kerr nonlinearity is formed. The unique characteristic of glass is accessibility to all domains of possible temporal dispersion (normal, zero and anomalous) in the spectral range of currently available femtosecond pulse sources. In particular, the anomalous dispersion regime enables simultaneous self-focusing in space (X) and time (T), yielding complex dynamics of the beam involving several mechanisms that couple between the X and T dimensions. We show that under certain circumstances, the combination of these mechanisms can lead to simultaneous spatial and spectral filtering in the continuous sample as well as steering of the point of break-up, and beam trapping in the periodic sample, using near-field microscopy and conventional spectroscopy.

Near-field imaging of short pulse dynamics in nonlinear planar silica waveguides

Imaging by a simplified near-field scanning optical microscope and numerical simulations reveal the complex spatiotemporal dynamics during the propagation of 60-fs pulses in nonlinear planar silica waveguides, in the anomalous dispersion regime.

Quasi-stable propagation of short laser pulses in silica waveguide arrays in the anomalous dispersion regime

A sharp transition to strong spatial localization, observed (as function of laser power) for short pulses in waveguide arrays with anomalous dispersion, suggests a broad regime of quasi-stable propagation. Numerical simulations support this interpretation.