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Controlling the output beam of a multimode fiber (MMF) is quite a hot topic currently because it offers several attractive perspectives. Among the various technics used to shape the output beam of a multimode fiber, the adaptive approaches rely on a measurement (objective function) which feeds an algorithm for further command of a spatial modulator for optimization. This approach gives several advantages:...
During the last years, multimode fibers (MMFs) were used as an experimental platform for the observation of complex nonlinear propagation phenomena, thanks to their additional spatiotemporal degrees of freedom with respect to single mode fibers. Multimode solitons [1], geometric parametric instability [2], self-induced beam cleaning (SBC) [3] and supercontinuum generation have been reported [4]. In...
Focused light spots at the output of a multimode fiber amplifier have been shaped by profiling the input signal wavefront using adaptive optimization, despite of mode coupling, mode dependent gain and saturation.
We report on fabrication and preliminary characterization of novel optical switches based on phase transition VO2 thin films. The electrically-induced VO2 phase transition leads to radical changes in material's optical properties, which may be further implemented in fast modulators for short-pulsed lasers applications.
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