Experimental validation and mathematical simulation of multi-pulse evolution and mid-infrared supercontinuum generation in fibers cascaded system

Abstract

We present a demonstration on mid-infrared supercontinuum (MIR-SC) generation in a multi-pulse pumped and multi-fiber cascaded system in simulation and experimental research ways. Finding that the effect of pulse fission in fiber amplifiers can greatly affect the nonlinear process in the follow-up fibers. Besides, with the aid of high-power laser and low-loss fusion splicing technology of soft-glass fibers, we obtained a 2.8 W, 1.9–4.8 μm MIR-SC in a 12 m-long InF3 fiber, spectral fluctuation in 2.26–4.16 μm less than 0.1 dB, shows ultra-high flatness. Continue to inject this laser into a 3 m-long As2S3 fiber, the spectrum long wavelength is extended to 6.45 μm, and power is decayed to 1.06 W. By combining the statistical approach that we have ever proposed with the precise theoretical model built in this work, we achieved a good agreement of the simulated and experimental curves. This will lay a solid foundation for broadband and high-power MIR-SC generation.