Single-mode Condition and Bending Loss Analysis of Ultrafast Laser-inscribed Mid-infrared Waveguides in GeAsSe Chalcogenide Glass

In this study, single-mode conditions and bending losses of optical waveguides based on Ge33As12Se55 chalcogenide glass, commercially known as IG2, for astrophotonic devices in the mid-infrared spectral range are numerically analyzed. The scalar finite-element method was used to analyze single-mode conditions. For the bending-loss analysis, equivalent straight waveguides of bent waveguides were analyzed using the two-dimensional finite-difference beam-propagation method. The results revealed design rules for astrophotonic optical integrated circuits in the mid-infrared spectral range.