University of Twente Student Theses


Modelling and material characterization of Er-doped waveguide amplifiers in polycrystalline Al2O3

Szybisty, Zuzanna (2023) Modelling and material characterization of Er-doped waveguide amplifiers in polycrystalline Al2O3.

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Abstract:This paper focuses on modelling and material characterization of Er - doped waveguide amplifiers in a novel polycrystalline Al2O3 platform. The simulations are developed based on a rate equation model and compared with measured data. Simulated data shows peak gain in accordance with measurements of γ-Al2O3 : Er3+ devices. Minor disparities occurred at lower pump powers, most likely due to insufficient accuracy of the spectroscopic parameters. Based on the model close to no quenching is expected and a relatively high energy transfer upconversion compared to the amorphous phase. The α-Al2O3 is evaluated as a similarly promising material. The emission spectrum of the polycrystalline γ-Al2O3 : Er3+ has been measured and used to calculate emission and absorption cross-section spectra using the reciprocity method. The material characterisation was done through X-ray diffraction and transmission electron microscopy measurements and confirmed the existence of polycrystalline γ-Al2O3 after 550C annealing. Increase in crystallinity with annealing temperature has been observed, which is expected to increase emission intensity and decrease propagation losses as has been seen in the annealed waveguide amplifiers. Crystalitte grains with average size below 6 nm and no Er clustering were found, which substantiates the claim of extremely low quenching.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:33 physics, 51 materials science, 53 electrotechnology
Programme:Electrical Engineering BSc (56953)
Awards:Best scientific work of a BSc thesis in Electrical Engineering of the academic year 2022/2023
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