Giant saturable absorption in thin Sb2Te3 layers: development and characterization

Richard-Nicolas Verrone; Andrea Campos; Martiane Cabié; Carine Perrin-Pellegrino; Julien Lumeau; Jean-Yves Natoli; Konstantinos Iliopoulos

doi:10.1117/12.2597345

12 September 2021 Giant saturable absorption in thin Sb₂Te₃ layers: development and characterization

Richard-Nicolas Verrone, Andrea Campos, Martiane Cabié, Carine Perrin-Pellegrino, Julien Lumeau, Jean-Yves Natoli, Konstantinos Iliopoulos

Author Affiliations +

Proceedings Volume 11872, Advances in Optical Thin Films VII; 118720C (2021) https://doi.org/10.1117/12.2597345
Event: SPIE Optical Systems Design, 2021, Online Only

Abstract

With the increase of the laser powers and the decrease of the pulse durations, materials with very large optical nonlinearities are of great interest for the laser community. Indeed, depending on the type of the nonlinearities, they can be used for several applications including frequency conversion and self-focusing. In particular, saturable absorbers are widely studied, as they allow mode-locking of laser systems or super-resolved laser writing. In this work, we have studied the saturable absorption efficiency of Sb₂Te₃ thin layers. Layers with thicknesses ranging from 2.5 to 30 nm have been deposited using electron beam deposition (Bühler SYRUSpro 710). These films were then annealed in a temperature-controlled furnace at 250°C during 1h to ensure that the layers are completely crystallized. These layers were then thoroughly inspected with X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Backscattered electron detector (BSD) and Transmission Electron Microscopy (TEM). The nonlinear optical properties under nanosecond and femtosecond pulse duration were also studied for each layer using the Z-Scan technique. These studies allowed the determination of the nonlinear absorption and the nonlinear refraction of the samples under two different wavelengths at each pulse duration regime. In this paper we present a correlation between the structure of the Sb₂Te₃ thin films and the observed nonlinearities.

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Richard-Nicolas Verrone, Andrea Campos, Martiane Cabié, Carine Perrin-Pellegrino, Julien Lumeau, Jean-Yves Natoli, and Konstantinos Iliopoulos "Giant saturable absorption in thin Sb₂Te₃ layers: development and characterization", Proc. SPIE 11872, Advances in Optical Thin Films VII, 118720C (12 September 2021); https://doi.org/10.1117/12.2597345

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