Mohammad Amin Eftekhar

TL;DR: Efficient supercontinuum generation that extends into the visible spectral range by pumping a low differential mode group delay graded index multimode fiber in the normal dispersion regime is observed and could pave the way for high brightness, high power, and compact, multi-octave continuum sources.

TL;DR: In this article, accelerated nonlinear intermodal interactions in core-diameter decreasing multimode fibers have been studied and shown to lead to relatively blue-shifted multimode solitons and blue-drifting dispersive wave combs, while in the normal domain, a notably flat and uniform supercontinuum, extending over 2.5 octaves.

TL;DR: It is theoretically demonstrated that the pump's spatial profile can provide a degree of freedom in tailoring at will the nonlinear dynamics and the ensuing spectral content of supercontinuum generation in highly multimoded optical fibers.

TL;DR: It is shown that germanium-doped graded-index multimode silica fibers can exhibit relatively high conversion efficiencies for second-harmonic generation when excited at 1064 nm, and this frequency-doubling behavior is found to be accompanied by an effective downconversion.

TL;DR: In this article, the authors investigated the scattering response of parity-time symmetric structures and showed that such structures can deflect light in unusual ways, as a function of the gain/loss contrast.