100.4 W All-Fiber Visible Supercontinuum Source Based on Graded-Index Multimode Fiber

An all-fiber high-power visible light super-continuum (SC) source based on graded-index multimode fiber (GRIN MMF) is presented. In the experiment, a picosecond pulse laser with a center wavelength of 1062 nm is amplified by a multimode ytterbium-doped double-clad fiber (YDF) with a core/cladding size of 50/400 μm and then injected into a 10 m 50/125 μm GRIN MMF to produce an output power of 100.4 W, covering a spectral range of 480–1700 nm. This work demonstrates for the first time the use of pumping GRIN MMF with large-core-diameter multimode YDF, effectively suppressing nonlinear broadening of the pump light. The approach enables broadband SC generation from the visible to near-infrared regions, offering a new route for high-power all-fiber SC sources.