High-performance mid-infrared supercontinuum generation in all-anomalous-dispersion AsSe2-As2 S5 chalcogenide hybrid microstructured optical fibers

Mid-infrared (Mid-IR) supercontinuum (SC) generation with a large optical bandwidth and an easily fabricated device is poised to become an enabling technology for Mid-IR SC devices.In this work, we numerically demonstrate Mid-IR SC generation in all-anomalous dispersion AsSe 2 -As 2 S 5 chalcogenide (ChG) hybrid microstructured optical fibers (HMOFs).To achieve Mid-IR SC spectra extending beyond 10 m, As 2 S 5 and AsSe 2 ChG materials were considered, owing to their high transparency in this spectral range.The optimized fiber, consisting of an AsSe 2 core (radius r = 1.9 m) and an As 2 S 5 cladding (radius R = 4.4 m), exhibits all-anomalous dispersion with small magnitudes ranging from +4.08 ps/nm/km to +49.78 ps/nm/km over the wavelength range from3.2m to 10 m and supports a well-confined fundamental TE mode (horizontally polarized), using a two-dimensional finite-difference eigenmode solver.Numerical simulations performed using the split-step Fourier method show that, when pumped with 200-fs pulses and a peak power of 3000 W at a wavelength 3.4 m, the 4.0-mm-long AsSe 2 -As 2 S 5 HMOFs can generate SC spectra spanning from 1.7 m to 9.3 m (-40 dB bandwidth of 7600 nm).By increasing the pulse duration to 300 fs and using the same pump source, the 5.8-mm-long fiber achieves an even broader spectrum, covering 1.7 m to 10.2 m.The nonlinear broadening mechanisms are dominated by self-phase modulation and four-wave mixing.The demonstrated high-performance Mid-IR SC generation-combining ultra-broadband operation, compact structure, and low-energy (< 1 pJ) pulse requirements-shows strong potential for enabling novel on-chip Mid-IR SC device architectures.