Design of composite nanofibers for new all-solid state Raman wavelength converters

¹ Université Paris-Saclay, Institut d’Optique Graduate School, CNRS, Laboratoire Charles Fabry, 91127, Palaiseau, France
² Ecole Militaire Polytechnique, Laboratoire Systèmes Lasers, BP17, 16111, Bordj-El-Bahri, Algiers, Algeria
³ Thales Research and Technology, 91767, Palaiseau Cedex, France
⁴ Institut Femto-ST, CNRS, Université Bourgogne, Franche-Comté, 25030 Besançon, France

^* Corresponding author: sylvie.lebrun@institutoptique.fr

Published online: 31 October 2024

Abstract

We present the design of composite optical nanofibers coated with different nonlinear materials (PMMA and TiO₂) for the realization of new all-solid state Raman wavelength converters. Two coating processes, multilayer dip-coating and atomic layer deposition, have been successfully developed and optimized for the functionalization, inducing only relatively low losses comprised between 0.5 dB and 1.76 dB on 2 cm. Encapsulation has also been demonstrated. The Raman modal gain coefficients have been calculated to lie between 0.3 and 0.4 m^-1W^-1. Based on our previous results obtained with nanofibers immersed in different liquids, Raman threshold in the ns second regime should be obtained with few cm long nanofibers. This work opens the way to a new family of composite nanofibers for different applications in nonlinear optics.