Seminar series
Date
Thu, 25 Nov 2010
Time
16:00 -
17:30
Location
DH 1st floor SR
Speaker
Andrey Gorbach
Organisation
University of Bath
In my talk I will introduce the concept of spectral discrete solitons
(SDSs): solutions of nonlinear Schroedinger type equations, which are localized on a regular grid in frequency space. In time domain such solitons correspond to periodic trains of pulses. SDSs play important role in cascaded four-wave-mixing processes (frequency comb generation) in optical fibres, where initial excitation by a two-frequency pump leads to the generation of multiple side-bands. When free space diffraction is taken into consideration, a non-trivial generalization of 1D SDSs will be discussed, in which every individual harmonic is an optical vortex with its own topological charge. Such excitations correspond to spatio-temporal helical beams.