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

Amphon Lukboon^a,b, Panatcha Anusasananan^a, Mongkol Wannaprapa^c, Suksan Suwanarat^a,*

 
ABSTRACT:     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 demonstrateMid-IRSCgenerationinall-anomalousdispersionAsSe2-As2 S5 chalcogenide(ChG)hybridmicrostructured optical fibers (HMOFs). To achieve Mid-IR SC spectra extending beyond 10 ?m, As2 S5 and AsSe2 ChG materials were considered, owing to their high transparency in this spectral range. The optimized fiber, consisting of an AsSe2 core (radius r = 1.9 ?m) and an As2 S5 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 from?3.2 ?m 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 AsSe2-As2 S5 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.

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* Corresponding author, E-mail: suksan@ru.ac.th

Received 19 Nov 2024, Accepted 0 0000