We report what we believe to be the first octave-spanning supercontinuum generation from all-normal dispersion waveguide on a silicon-based chip in the mid-infrared. Here we use 205 fs pulses at 4 μm coupled to low loss, 5.0 μm x 2.7 μm cross-section, silicon germanium-on-silicon waveguide operating in tha all-normal dispersion regime. Generated supercontinuum spans more than an octave between 2.8 and 5.7 μm. Besides, simulations show a high degree of coherence across the entire -30 dB spectrum. Such supercontinuum provides an ideal light probe for broadband mid-infrared molecular absorption spectroscopy.
We report mid-infrared supercontinuum generation in a silicon germanium-on-silicon waveguide. We show that, by adding a chalcogenide cladding, it is possible to trim a posteriori the waveguide’s dispersion profile which, in turn, governs the properties of the generated supercontinuum. In particular, we experimentally show that a shift from anomalous to normal dispersion takes place when a 1.26 μm thick cladding layer of Ge11.5As24Se64.5 is added. Finally, we show that the group velocity dispersion of the waveguide can be precisely controlled by changing the thickness of the cladding layer.
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