Nabil S Abdel-Moneim

Learn More
We select a chalcogenide core glass, AsSe, and cladding glass, GeAsSe, for their disparate refractive indices yet sufficient thermalcompatibility for fabricating step index fiber (SIF) for mid-infrared supercontinuum generation (MIR-SCG). The refractive index dispersion of both bulk glasses is measured over the 0.4 μm–33 μm wavelength-range, probing the(More)
A series of xAs40Se60·(100 - x)As40S60 glasses, where x = 0, 25, 33, 50, 67, 75 and 100 mol% As40Se60, has been studied using neutron and X-ray total scattering, Raman spectroscopy and (77)Se MAS-NMR. The results are presented with measurements of non-linear refractive indices, n2, and densities. There is no evidence for the formation of homopolar bonds in(More)
Fundamental mechanisms of the intensity-dependent refractivity in optical glasses have been less understood than those in two-level atoms and crystalline semiconductors. In the work, the concept based on the strong dependence of nonlinear refractive index on the bandgap energy is developed. Spectral dependence of the nonlinear refractive index near the(More)
In this paper, the temporal dynamics of the non-linear response of chalcogenide glass samples of the system As-S-Se have been studied near the bandgap frequencies of the samples by using the interferometric pump-probe method. The pumping laser frequency was located in the spectral range of the Urbach tail or weak-absorption tail at the edge of the(More)
  • 1