Study of supercontinuum generation in etch-coated tellurium based chalcogenide waveguide

Abstract

This study introduces a novel design of an optical waveguide for enhancing supercontinuum (SC) generation spectra in mid-infrared region. This research contains two types of tellurium-based chalcogenide waveguides. The core and cladding materials are composed of Ge₂₀As₂₀Se₁₅Te₄₅ and Ge_11.5As₂₄S_64.5 respectively. By employing the hyperbolic secant laser pulses with 50 femtosecond full-width half-maxima (FWHM), the structure results broad SC. The type-C waveguide produces SC ranging from 3 to 7.2 µm, 2.8 to 8.7 µm and 2.7 to 10.5 µm while pumped by lasers with a central wavelength of 4.5µm and produces 3.5 to 8µm, 3.1 to 9.2 µm and 2.8 to 11.1 µm, with central wavelength 5.1 µm and pulse peak powers of 0.5 kW, 1 kW and 2 kW, respectively. These findings highlight the potential of these waveguides in producing broad spectra within SC sources, showcasing their utility in advanced light generation applications.