Flat mid-infrared supercontinuum generation in tapered fiber with thin coating of highly nonlinear glass

Abstract

The enhancement of nonlinear characteristics of a tapered fiber, which is covered with a thin layer of highly nonlinear glass, is theoretically studied in this work. The generation of a flat, octave spanning supercontinuum extending from 750 nm to 2750nm (at -20dB) has been numerically presented by considering the coupling of the proposed structure with a typical Yb laser able to emit ultrashort pulses. The physical processes behind the SC formation are described in the anomalous dispersion regions.