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<p>The mid-infrared (MIR) region has attracted much attention because many molecules show distinct absorption bands in this range, making it valuable for applications such as environmental monitoring, medicine, and spectroscopy. However, to efficiently generate and use light in the MIR region, broadband and stable light sources are required. Nonlinear optical fibers provide an excellent solution, as they enable dispersion control and supercontinuum generation (SCG) in the MIR. We introduce a chalcogenide fiber design featuring an As<sub>2</sub>Se<sub>3</sub> core, eight symmetrically positioned As<sub>2</sub>S<sub>5</sub> rods, and an AsSe<sub>2</sub> cladding. The refractive index contrast among these materials provides strong optical confinement and flexible dispersion engineering. By adjusting structural parameters, including the core diameter, rods diameter, and the distance from core to rods, the fiber can operate in the normal-dispersion regime and support broadband SCG. Numerical simulations indicate spectral coverage extending from 2.4 to 13.8&#xa0;μm under various pump conditions. This design suggests potential applicability in mid-infrared supercontinuum sources for spectroscopy and sensing-related studies.</p>

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Two octave supercontinuum generation in chalcogenide all-solid microstructured optical fibers

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Anh Que Nguyen,
  • Thu Thi Minh Tran,
  • Dung Thi My Cao,
  • Anh Thi Tram Tu,
  • Hieu Van Le,
  • Takenobu Suzuki,
  • Yasutake Ohishi,
  • Hoa Phuoc Trung Nguyen

摘要

The mid-infrared (MIR) region has attracted much attention because many molecules show distinct absorption bands in this range, making it valuable for applications such as environmental monitoring, medicine, and spectroscopy. However, to efficiently generate and use light in the MIR region, broadband and stable light sources are required. Nonlinear optical fibers provide an excellent solution, as they enable dispersion control and supercontinuum generation (SCG) in the MIR. We introduce a chalcogenide fiber design featuring an As2Se3 core, eight symmetrically positioned As2S5 rods, and an AsSe2 cladding. The refractive index contrast among these materials provides strong optical confinement and flexible dispersion engineering. By adjusting structural parameters, including the core diameter, rods diameter, and the distance from core to rods, the fiber can operate in the normal-dispersion regime and support broadband SCG. Numerical simulations indicate spectral coverage extending from 2.4 to 13.8 μm under various pump conditions. This design suggests potential applicability in mid-infrared supercontinuum sources for spectroscopy and sensing-related studies.