title: Second harmonic generation in thin optical fibers via cladding modes.
abstract: Since silica goes under the category of amorphous materials, it is difficult to investigate important processes such as second harmonic generation (SHG) in silica-based fibers. In this paper, we proposed a method for SHG relaying on cladding modes as pump modes. Cladding modes are introduced in optical fibers through tilted long period grating (T-LPG), where power of core mode is transferred into cladding modes. By functionalizing T-LPG with nonlinear coating, the interaction occurs between cladding modes and the coating material, consequently second harmonic signal (SHS) is generated with efficiency up to 0.14%.
authors.forename: Eman A
authors.initials: EA
authors.lastname: Elzahaby
authors.forename: Ishac
authors.initials: I
authors.lastname: Kandas
authors.forename: Moustafa H
authors.initials: MH
authors.lastname: Aly