Ultra-broadband mid-infrared supercontinuum generation in square lattice As2S3 chalcogenide photonic crystal fibers

• Published in: Optik (Stuttgart) Vol. 319; p. 172113
• Main Authors: Chu Van, Ben, Dang Van, Trong, Phan Thi, Lan, Chu Van, Lanh
• Format: Journal Article
• Language: English
• Published: Elsevier GmbH 01-12-2024
• Subjects: All-normal dispersion; Anomalous dispersion; Photonic crystal fiber (PCF); Square lattice; Supercontinuum generation; Supercontinuum generation; All-normal dispersion; Photonic crystal fiber (PCF); Square lattice; Anomalous dispersion
• ISSN: 0030-4026
• DOI: 10.1016/j.ijleo.2024.172113

This work presents a numerical model of a photonic crystal fiber made up of chalcogenide glass for highly coherent supercontinuum generation in the mid-infrared spectral region. Numerical simulations based on the finite element method have been performed. An optical dispersion engineering technique has been adopted to minimize the dispersion effect at pump wavelength by alteration of geometrical parameters of designed fiber. We have selected two optimal structures from the simulation results to analyze the nonlinear characteristics and supercontinuum generation. The first fiber, #F1 with a lattice constant of 1.0 μm and a filling factor of 0.3 operates in all-normal dispersion, providing the spectrum SC in the range of 2.4 μm to 8.0 μm with a pump wavelength of 5.0 µm, pulse duration of 90 fs, and peak power of 6 kW. Meanwhile, fiber #F2 has anomalous dispersion regimes. With a peak power of 2 kW, this fiber produces a wide SCG with spectral ranges of 4.4–16 μm. The proposed structures are promising for applications in low-peak power all-fiber optical systems.