Abstract

Broadband supercontinuum sources are of interest for various applications. The near-infrared region (1-3 μm) is specifically useful for biomedical diagnostics. One of the promising media for supercontinuum generation in the infrared region is the strongly guiding nonlinear waveguide with an arsenic trisulfide core (As₂S₃) and a fused silica cladding. The geometrical and chemical properties of such a waveguide allow to finely tune the dispersion landscape and nonlinearity through the core diameter variations. Here we report the generation of octave-spanning supercontinuum in As₂S₃-silica hybrid nanospike waveguides pumped by a thulium-doped all-fiber femtosecond laser and amplifier system at 1.9 μm wavelength. The widest supercontinuum was obtained in the wavelength range from 1.1 to 2.5 μm (full width at −10 dB) in the waveguide with a core diameter of 1.7 μm. Generation of significant dispersive waves, as well as third harmonics component, is observed. Numerical simulation shows that the generated supercontinua are coherent in the entire spectral range and can be exploited to create a self-referenced laser comb.

Coherent octave-spanning mid-infrared supercontinuum generated in As₂S₃-silica double-nanospike waveguide pumped by femtosecond Cr:ZnS laser

Shangran Xie, Nikolai Tolstik, John C. Travers, Evgeni Sorokin, Celine Caillaud, Johann Troles, Philip St.J. Russell, and Irina T. Sorokina
Opt. Express 24(11) 12406-12413 (2016)

Octave-spanning supercontinuum generation in in situ tapered As₂S₃ fiber pumped by a thulium-doped fiber laser

Charles W. Rudy, Alireza Marandi, Konstantin L. Vodopyanov, and Robert L. Byer
Opt. Lett. 38(15) 2865-2868 (2013)

As₂S₃–silica double-nanospike waveguide for mid-infrared supercontinuum generation

Shangran Xie, Francesco Tani, John C. Travers, Patrick Uebel, Celine Caillaud, Johann Troles, Markus A. Schmidt, and Philip St.J. Russell
Opt. Lett. 39(17) 5216-5219 (2014)

Broadband mid-infrared supercontinuum generation in dispersion-engineered As₂S₃-silica nanospike waveguides pumped by 2.8  μm femtosecond laser

Pan Wang, Jiapeng Huang, Shangran Xie, Johann Troles, and Philip St.J. Russell
Photon. Res. 9(4) 630-636 (2021)

Mid-infrared supercontinuum generation based on cascaded Raman scattering in a few-mode As₂S₃ fiber pumped by a thulium-doped fiber laser

Jinmei Yao, Bin Zhang, Ke Yin, Linyong Yang, Jing Hou, and Qisheng Lu
Opt. Express 24(13) 14717-14724 (2016)