Ricerc@Sapienza

In this project, the spatiotemporal mode-locking (STML) in multimode fibers will be investigated by a theoretical model and preliminary experimental demonstrations. Compared with conventional mode-locking, the STML system can sustain high power, have high nonlinearity, a high degree to control coherent optical fields in 3D+1 dimension. Different effects leading to the mode-locking will be investigated, such as saturable absorber, Kerr effects, polarization control. Intelligent algorithms, such as machine learning, will be designed in multimode fiber lasers to automatically lock on and switch to any possible operation regime in a fixed laser cavity, such as FML, HML, QS, and QML. Moreover, other solutions also will be investigated, such as transverse mode-locking, spiral fields, conical waves. Preliminary experimental demonstrations will be implemented to verify the model. This work will open new directions in the studies of three-dimensional nonlinear wave propagation in multimode fibers.