Mid-infrared supercontinuum generation in an AsSe2-As2S5 hybrid microstructured optical fiber

A four-hole AsSe₂-As₂S₅ hybrid microstructured optical fiber (HMOF) with a large refractive index difference is fabricated by the rod-in-tube drawing technique. The core and the cladding are made from the AsSe₂ glass and As₂S₅ glass, respectively. The propagation loss is ~1.2 dB/m and the nonlinear coefficient is ~4.937×10⁴ km^-1W^-1 at ~3000 nm. Zero dispersion wavelength (ZDW) of the HMOF is ~3380 nm. Supercontinuum (SC) generation in the HMOF is investigated by pumping a 2 cm-long AsSe₂-As₂S₅ HMOF with the wavelengths of ~3062, 3241 and 3389 nm from a tunable optical parametric oscillator (OPO) system. Broadband mid-infrared SC generation with the spectrum from ~1256 to 6385 nm is obtained with the peak power of ~1337 kW at the wavelength of ~3389 nm.