Spatiotemporal characterization of supercontinuum extending from the visible to the mid-infrared in a 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.

[1]  Daniel A. Nolan,et al.  Self-organized instability in graded-index multimode fibres , 2016 .

[2]  Logan G. Wright,et al.  Visible supercontinuum generation in a graded index multimode fiber pumped at 1064  nm. , 2016, Optics letters.

[3]  Vincent Couderc,et al.  Observation of Geometric Parametric Instability Induced by the Periodic Spatial Self-Imaging of Multimode Waves. , 2016, Physical review letters.

[4]  Logan G. Wright,et al.  Controllable spatiotemporal nonlinear effects in multimode fibres , 2015, Nature Photonics.

[5]  S. Longhi.  Modulational instability and space-time dynamics in nonlinear parabolic-index optical fibers. , 2003, Optics letters.

[6]  Vincent Couderc,et al.  Observation of Raman optical activity by heterodyne-detected polarization-resolved coherent anti-Stokes Raman scattering. , 2012, Physical review letters.

[7]  Zach DeVito,et al.  Opt , 2017 .

[8]  R. Alfano,et al.  Self-focusing and self-phase modulation in a parabolic graded-index optical fiber. , 1988, Optics letters.

[9]  Andrew G. Glen,et al.  APPL , 2001 .

[10]  Frank W. Wise,et al.  Ultrabroadband dispersive radiation by spatiotemporal oscillation of multimode waves , 2015, 2016 Conference on Lasers and Electro-Optics (CLEO).

[11]  N. Terry,et al.  An explanation of SRS beam cleanup in graded-index fibers and the absence of SRS beam cleanup in step-index fibers. , 2007, Optics express.

[12]  C. Fallnich,et al.  Ultrafast two-color all-optical transverse mode conversion in a graded-index fiber , 2015, 2016 Conference on Lasers and Electro-Optics (CLEO).

[13]  J. Dudley,et al.  Supercontinuum generation in photonic crystal fiber , 2006 .

[14]  G. Millot,et al.  Nonlinear virtues of multimode fibre , 2015, Nature Photonics.

[15]  G. Agrawal,et al.  Stimulated Raman scattering cascade spanning the wavelength range of 523 to 1750 nm using a graded-index multimode optical fiber , 2013, 1301.6203.

[16]  F. Wise,et al.  Optical solitons in graded-index multimode fibres , 2013, Nature Communications.

[17]  V. Couderc,et al.  Spectro-temporal shaping of supercontinuum for subnanosecond time-coded M-CARS spectroscopy. , 2016, Optics letters.

[18]  R. Stephenson.  A and V , 1962, The British journal of ophthalmology.