Frequency-Resolved Spatial Beam Mapping in Multimode Fibers: Application to Mid-Infrared Supercontinuum Generation
arXiv:2106.15837 · doi:10.1364/OL.428623
Abstract
We present a new spatial-spectral mapping technique permitting to measure the beam intensity at the output of a graded-index (GRIN) multimode fiber with sub-nanometric spectral resolution. We apply this method to visualize the fine structure of the beam shape of a sideband generated at 1870 nm by geometric parametric instability (GPI) in a GRIN fiber. After spatial-spectral characterization, we amplify the GPI sideband with a Tm-doped fiber amplifier to obtain a microjoule-scale picosecond pump whose spectrum is finally broadened in a segment of InF3 optical fiber to achieve supercontinuum ranging from 1.7 μm up to 3.4 μm
4 pages, 6 Figures
References in corpus (6)
- Spatiotemporal mode-locking in multimode fiber lasers
- Spatial beam self-cleaning in multimode fiber
- Observation of geometric parametric instability induced by the periodic spatial self-imaging of multimode waves
- Self-organized instability in graded-index multimode fibres
- Mid IR hollow core fiber gas laser emitting at 4.6 um
- Low-noise octave-spanning mid-infrared supercontinuum generation in a multimode chalcogenide fiber