Mid-infrared broadband supercontinuum generation in a highly nonlinear rectangular core chalcogenide photonic crystal fiber

Abstract

Abstract We report the numerical modeling of a highly nonlinear rectangular core Ga-Sb-S chalcogenide photonic crystal fiber for supercontinuum generation in the mid-infrared region. Numerical investigation of linear and nonlinear optical processes has been performed. A finite element method has been employed to study the optical characteristics of confined fundamental mode. Optimization of geometrical parameters i.e., pitch, the diameter of bigger and smaller air-holes has been done in order to achieve small and normal dispersion at the pump wavelength. The proposed design is capable of generating supercontinuum spanning 1–14 µm using a 9 mm long fiber pumped with 90 fs secant hyperbolic pulse of the peak power of 8.19 kW. Such photonic crystal fiber structure in Ga-Sb-S chalcogenide glass is reported the first time and can be proven effective for nonlinear applications of photonic devices.