We overview recent advances in the research on spatiotemporal beam shaping in nonlinear multimode optical fibers. An intense light beam coupled to a graded index (GRIN) highly multimode fiber undergoes a series of complex nonlinear processes when its power grows larger. Among them, the lowest threshold effect is the Kerr-induced beam self-cleaning, that redistributes most of the beam energy into a robust bell-shaped beam close to the fundamental mode. At higher powers a series of spectral sidebands is generated, thanks to the phase matching induced by the long period grating due to the periodic self-imaging of the beam and the Kerr effect. Subsequently a broadband and spectrally flat supercontinuum is generated, extending from the visible to the mid-infrared.
Stefan Wabnitz, Alessandro Tonello, Vincent Couderc, Daniele Modotto, Alain Barthélémy, Guy Millot, and Katarzyna Krupa, "Nonlinear dynamics in multimode optical fibers," Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105402B (Presented at SPIE OPTO: February 01, 2018; Published: 26 January 2018); https://doi.org/10.1117/12.2287874.
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