Mid-IR supercontinuum generation using a slab with D-shaped/semi-ellipse core waveguide at 4μm

Abstract

In the present article, we designed a D-shaped optical waveguide for supercontinuum generation. The designed waveguide consists of a slab with a D-shape core (or semi-ellipse) made of As2Se3 which is sandwiched between top and bottom claddings made of GeAsS chalcogenide glass. Pulse confinement, transmission loss, and nonlinear parameters are taken to be in consideration while optimizing the waveguide parameters. In this work, we have numerically calculated the effect of waveguide parameters on dispersion. In addition, we have studied the effect of the D-shaped parameter ‘b’ on the supercontinuum spectrum. For b = 1.9 μm, the proposed waveguide achieves a broad-band supercontinuum spanning from 1.9 μm to 24.5 μm by pumping 50 fs pulse duration sech pulses at the central wavelength of 4 μm, with a peak power of 5 kW. Apart from this, we have also evaluated the supercontinuum spectra with 1 kW, and 2 kW peak powers. The designed waveguide in this paper is easy to fabricate because of its semi-ellipse core shape. From the numerical results, it is pointed out that the proposed waveguide should be useful in the generation of supercontinuum sources, telecommunications, and spectroscopy in the mid-infrared region.