From Event: SPIE Defense + Commercial Sensing, 2019
We simulate supercontinuum generation for various shapes of a dispersion varying As2S3 waveguides on MgF2 substrate with air cladding. The supercontinuum generation is simulated for pulses of 2000 W peak power and 50 fs pulse width centered at 1.55 μm wavelength. For a uniform waveguide the generated spectrum is considerably narrower than that for a non-uniform waveguide. This is because the non-uniform waveguide allows a continuous phase matching of the generated waves through nonlinear interaction. We have demonstrated that a high coefficient of nonlinear refractive index is necessary for generating supercontinuum with large bandwidths. Larger supercontinuum bandwidth is predicted for waveguides with increasing As2S3 thickness along the propagation direction.
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Lucas Railing, Sunil Thapa, Xiang Zhang, and Niloy Dutta, "Generating supercontinuum in dispersion varying As2S3 waveguides," Proc. SPIE 11000, Fiber Optic Sensors and Applications XVI, 110000A (Presented at SPIE Defense + Commercial Sensing: April 16, 2019; Published: 14 May 2019); https://doi.org/10.1117/12.2518245.