Abstract
Three distinct configuration of As2S3 chalcogenide photonic crystal fibers were designed to investigate supercontinuum generation (SCG). The optical properties of PCFs with the circular lattice (CL), square lattice (SL), and hexagonal lattice (HL) were comprehensive analyzed to choose the optimal fiber for SCG. This investigation facilitated the identification of three superior structures, specifically designated as #CF, #SF, and #HF, respectively. These structures are unified by their operation within an all-normal dispersion regime, each presenting a lattice constant of 1.0 µm and a filling factor of 0.35. These fibers were subjected to a pump energyof 1.08 nJ and a pulse duration of 270 fs, culminating in an expansive supercontinuum range. Notably, the SC range extended from 2.0 µm to 6.5 µm for #CF, from 2.0 µm to 8.3 µm for #SF, and from 1.9 µm to 6.6 µm for #HF. The square lattice PCF exhibited the broadest supercontinuum, attributed to its protracted flat dispersion band. Furthermore, compared to previously reported all-normal dispersion PCFs, the spectral range facilitated by this pump energy was significantly augmented. This innovative structure concept offers potential applications in low pump energy all-fiber optical systems, heralding advancements in photonic technology.