Third-order nonlinear wavelength conversion in chalcogenide glass waveguides towards mid-infrared photonics

The increasing demand in spectroscopy and sensing calls for infrared (mid-IR) light sources. Here, we theoretically investigate nonlinear wavelength conversion of Ge₂₈Sb₁₂Se₆₀ chalcogenide glass waveguide in the mid-IR spectral regime. With waveguide dispersion engineering, we predict generation of over an octave wavelength (2.8 μm–5.9 μm) tuning range Raman soliton self-frequency shift, over 2.5 octaves wavelength cover range supercontinuum (1.2 μm–8.0 μm), as well as single soliton Kerr comb generated in suspended Ge₂₈Sb₁₂Se₆₀ waveguide. Our findings evidenced that Ge₂₈Sb₁₂Se₆₀ chalcogenide glass waveguides can simultaneously satisfy the generation of Raman soliton self-frequency shift, supercontinuum spectrum, and Kerr frequency comb generation through dispersion engineering towards mid-IR on chip.