Highly efficient few-mode spatial beam self-cleaning at 15µm
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Leventoux Y., Parriaux A., Sidelnikov O., Granger G., Jossent M., Lavoute L., Gaponov D., Fabert M., Tonello A., Krupa K., Desfarges-Berthelemot A., Kermene V., Millot G., Février S., Wabnitz S., Couderc V.
DOI: 10.1364/OE.392081
ISSN: 1094-4087
We experimentally demonstrate that spatial beam self-cleaning can be highly efficient when obtained with a few-mode excitation in graded-index multimode optical fibers. By using 160 ps long, highly chirped (6 nm bandwidth at -3dB) optical pulses at 1562 nm, we demonstrate a one-decade reduction of the power threshold for spatial beam self-cleaning, with respect to previous experiments using pulses with laser wavelengths at 1030-1064 nm. Self-cleaned beams remain spatio-temporally stable for more than a decade of their peak power variation. The impact of input pulse temporal duration is also studied.