Seminar Announcement: Francesco De Lucia
Data pubblicazione: 17-ott-2021
Tuesday, 19 October 2021, 15:00
Sala Grande Palazzina B via alla Cascata 56/C
"Functionalised optical fiber devices for Nonlinear Photonics: from high harmonics generation to Frequency Combs"
Prof. Francesco De Lucia
Université libre de Bruxelles, Service OPERA-photonique,
1050 Ixelles, Belgium
Most quadratic nonlinear devices are based on the “standard scheme” of the interaction between intense light waves and materials characterized by intrinsic second order susceptibility. This approach is however affected by thermal instabilities of nonlinear crystals, short interaction lengths, high costs, low damage thresholds, coupling losses etc. For these reasons the implementation of nonlinear all-fiber devices still represents a worthwhile effort. The possibility of creating an effective second order nonlinearity via the thermal poling process in materials naturally lacking any second order susceptibility is known since the early 1990s. Since then, the technique has been transferred from bulk glasses to optical fibers and explored in many aspects, from the electrode’s configurations to the type of electrodes used, etc. More recently, it has been demonstrated the possibility of merging the effects of the thermal poling with the intrinsic nonlinear properties of some 2D materials, with the scope of increasing the nonlinearity of these all-fiber devices. In this talk an historical excursus through the various steps along the thermal poling history is presented. The most recent results are also shown, including some interesting applications of periodically poled fibers, such as the generation of high harmonics or the generation of Frequency Combs when exploited in a cavity configuration.