23 February 2018 Ultrafast laser-inscribed waveguides in IG2 chalcogenide glass for mid-infrared photonics applications
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Abstract
We present the first demonstration of ultrafast laser-inscribed waveguides in IG2 chalcogenide glass and their coupling to a mid-infrared quantum cascade laser. The fabrication parameter space has been investigated, resulting in optimized single-mode waveguides that have estimated propagation losses of 1 dB/cm at 7.8 μm. Higher order mode propagation was also observed. The refractive index modification caused by ultrafast laser inscription has been empirically quantified by comparison with modeled waveguide parameters, resulting in Δn = 0.0097–0.0143 over the pulse energy range investigated. We will present these findings, alongside our initial investigation into waveguide bend losses, which prepare the building blocks towards mid-infrared evanescent field coupling and integrated sensing applications.
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Helen L. Butcher, David G. MacLachlan, David Lee, Robert R. Thomson, Damien Weidmann, "Ultrafast laser-inscribed waveguides in IG2 chalcogenide glass for mid-infrared photonics applications", Proc. SPIE 10535, Integrated Optics: Devices, Materials, and Technologies XXII, 1053514 (23 February 2018); doi: 10.1117/12.2288333; https://doi.org/10.1117/12.2288333
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