Spatiotemporal Characterization of Supercontinuum Extending from the   Visible to the Mid-Infrared in Multimode Graded-Index Optical Fiber
  We experimentally demonstrate that pumping a graded-index multimode fiber with sub-ns pulses from a microchip Nd:YAG laser leads to spectrally flat supercontinuum generation with a uniform bell-shaped spatial beam profile extending from the visible to the mid-infrared at 2500\,nm. We study the development of the supercontinuum along the multimode fiber by the cut-back method, which permits us to analyze the competition between the Kerr-induced geometric parametric instability and stimulated Raman scattering. We also performed a spectrally resolved temporal analysis of the supercontinuum emission. 
K. Krupa, C. Louot, V. Couderc, M. Fabert, R. Guenard, B. M. Shalaby,   A. Tonello, A. Barth\'el\'emy, D. Pagnoux, P. Leprou...
physics.optics