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All-Normal-Dispersion Chalcogenide Waveguides for Ultraflat Supercontinuum Generation in the Mid-Infrared Region

Karim, M. R., Ahmad, H. and Rahman, B. M. (2017). All-Normal-Dispersion Chalcogenide Waveguides for Ultraflat Supercontinuum Generation in the Mid-Infrared Region. IEEE Journal of Quantum Electronics, 53(2), 7100106.. doi: 10.1109/JQE.2017.2677380

Abstract

We show numerically, how a chalcogenide planar waveguide designed to exhibit normal dispersion over a wide spectral range around the pump wavelength can produce relatively flat supercontinuum in the mid-infrared regime. A 1-cm-long channel waveguide, made using Ge11.5As24Se64.5 glass and pumped at 1.55 gm using short optical pulses with only 25 W peak power, produced a supercontinuum that was nearly 600 nm wide. Employing the same pump source with a peak power of 100 W, the supercontinuum could be extended to beyond 2.2 gm with a bandwidth of 1000 nm. By shifting the pump wavelength to 3.1 gm and using pulses with peak powers of up to 3 kW, the resulting ultraflat supercontinuum extended from 2 to 5.5 gm. Even a wider spectral range (1.8-6 gm) can be realized if MgF2 glass is used for the lower cladding while maintaining power variations below 5 dB over the entire bandwidth.

Publication Type: Article
Additional Information: © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Publisher Keywords: Numerical analysis and approximation, Nonlinear optics, Dispersion, Chalcogenide, Channel waveguide, Supercontinuum generation
Departments: School of Mathematics, Computer Science & Engineering > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/18499
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