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<p>An ultrabroadband near-infrared region supercontinuum generation (SCG) is numerically illustrated using a 2&#xa0;cm-long novel astroid-like-shaped As<sub>2</sub>S<sub>3</sub> core and a Scott N-BK7 background material photonic crystal fiber (PCF). The PCF has a high nonlinear coefficient, γ = 21,917 W<sup>−1</sup>&#xa0;km<sup>−1</sup>, at the pumping wavelength of 1.3&#xa0;µm. The air holes of PCF are arranged in a hexagonal lattice structure. The generalized nonlinear Schrodinger equation is numerically solved using the interaction picture and local error methods to analyze the SCG. The pump wavelength of 1.3&#xa0;µm is chosen to operate in the anomalous dispersion regime near the zero-dispersion wavelength of 1.2878&#xa0;µm. A 65 W, 50&#xa0;fs laser pulse produced a broad SCG spanning 0.91–2.46&#xa0;µm, with an intensity of -70&#xa0;dB. SCG intensity of approximately -30&#xa0;dB is found in the 1.09–1.48&#xa0;µm wavelength range. The coherence evolution of the SCG spectrum is analyzed using the Gaussian spectrum phase-diffusion model. It was found that coherence gradually became disturbed with increasing pulse width. The SCG demonstrated in this paper, with the astroid-like shaped core, has potential for spectroscopy, metrology, and biosensing applications.</p>

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Numerical analysis of supercontinuum generation with ultra-low peak power input pulse in astroid-like shaped As2S3 core photonic crystal fiber

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • S Lalkrishna,
  • Jinesh Mathew,
  • Atul Kumar

摘要

An ultrabroadband near-infrared region supercontinuum generation (SCG) is numerically illustrated using a 2 cm-long novel astroid-like-shaped As2S3 core and a Scott N-BK7 background material photonic crystal fiber (PCF). The PCF has a high nonlinear coefficient, γ = 21,917 W−1 km−1, at the pumping wavelength of 1.3 µm. The air holes of PCF are arranged in a hexagonal lattice structure. The generalized nonlinear Schrodinger equation is numerically solved using the interaction picture and local error methods to analyze the SCG. The pump wavelength of 1.3 µm is chosen to operate in the anomalous dispersion regime near the zero-dispersion wavelength of 1.2878 µm. A 65 W, 50 fs laser pulse produced a broad SCG spanning 0.91–2.46 µm, with an intensity of -70 dB. SCG intensity of approximately -30 dB is found in the 1.09–1.48 µm wavelength range. The coherence evolution of the SCG spectrum is analyzed using the Gaussian spectrum phase-diffusion model. It was found that coherence gradually became disturbed with increasing pulse width. The SCG demonstrated in this paper, with the astroid-like shaped core, has potential for spectroscopy, metrology, and biosensing applications.