Department of Information Engineering, Electronics and Telecommunications
January 29th, 2021 Experimental and numerical studies of spatiotemporal femtosecond soliton propagation over up to 1 km spans of parabolic graded-index (GRIN) fibers reveal that initial multimode soliton pulses naturally and irreversibly evolve into a singlemode soliton. This is carried Read More …
Spatiotemporal Multimode Complex Optical Systems
Wavefront Shaping System for Nonlinear Fiber-Based Microscopy and Endoscopy
Multiscale Optical Frequency Combs: Advanced Technologies and Applications
Mastering spatiotemporal dissipative solitons
Waveshaping of optical beams for the control of light pulses by multimode fibers
January 13th, 2021 We propose a new semi-analytical model, describing the bandwidth evolution of pulses propagating in dispersion managed (DM) transmission systems using multimodal graded-index fibers (GRIN) with parabolic index. The model also applies to monomodal fiber DM systems, representing Read More …
October 1st, 2020 We demonstrate a new practical approach for generating multicolour spiral-shaped beams. It makes use of a standard silica optical fibre, combined with a titled input laser beam. The resulting breaking of the fibre axial symmetry leads to Read More …
September 25th, 2020 We experimentally demonstrate a previously unforeseen nonlinear effect in optical fibers: up-conversion luminescence generation excited by multiphoton absorption of femtosecond infrared pulses. We directly estimate the average number of photons involved in the up-conversion process, by varying Read More …
July 20th, 2020 We introduce a mechanism of stable spatiotemporal soliton formation in a multimode fiber laser. This is based on spatially graded dissipation, leading to distributed Kerr-lens mode locking. Our analysis involves solutions of a generalized dissipative Gross-Pitaevskii equation. Read More …