Staff View: Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman

Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman

Short-pulsed fibre lasers have received growing attention in the recent years owing to their usefulness in various scientific and industrial applications. In the early years, various saturable absorbers (SAs), mostly thin film SAs have been widely demonstrated. While these film SAs provide low cost...

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Main Author:	Mohd Fauzi , Ab Rahman
Format:	Thesis
Published:	2019
Subjects:	TK Electrical engineering. Electronics Nuclear engineering
Online Access:	http://studentsrepo.um.edu.my/11609/1/Mohd_Fauzi.pdf http://studentsrepo.um.edu.my/11609/2/Mohd_Fauzi.pdf http://studentsrepo.um.edu.my/11609/
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spelling	my.um.stud.116092020-08-18T23:44:24Z Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman Mohd Fauzi , Ab Rahman TK Electrical engineering. Electronics Nuclear engineering Short-pulsed fibre lasers have received growing attention in the recent years owing to their usefulness in various scientific and industrial applications. In the early years, various saturable absorbers (SAs), mostly thin film SAs have been widely demonstrated. While these film SAs provide low cost fabrication and simple preparation, they have low thermal damage threshold, which limits their ability as portable and robust laser source designs. In comparison, fibre SAs, are much robust, stable and have relatively good thermal handling. In this research work, a compact and stable passively all fibre Q-switched or mode-locked Ytterbium-doped fibre laser (YDFL), Erbium-doped fibre laser (EDFL) as well as Thulium-doped fibre laser (TDFL) were demonstrated by incorporating several short segments of fibre SAs in a forwarded pump ring cavity configuration. These fibre SAs, possess an absorption profile which partly overlaps with the gain medium emission profile, suggesting a possible realization of optical pulses generation. Particularly, in the 1 μm region, several fibre SAs including an 8 cm long Hafnium bismuth erbium co-doped fibre (HBEDF), a 12 cm long Ytterbium-doped fibre (YDF), an 11 cm long Titanium dioxide-doped fibre (TiO2DF), and an 11 cm long Thulium-doped fibre (TDF) were verified, viable of generating Q-switched YDFL. Meanwhile, in the 1.55 μm vicinity, an 11 cm long TDF and an 11 cm long Erbium-doped fibre (EDF) were tested, possible of promoting stable Q-switched EDFL; where a 20 cm long TiO2DF was examined feasible of demonstrating both, Q-switched and mode-locked EDFL. Additionally, in the 2 μm region, an 8 cm long Holmium-doped fibre (HDF) was tested, viable of promoting stable Q-switched and mode-locked TDFL. Experimentally, the fibre SAs (TiO2DF and HDF) were verified, possessing comparable laser performances with the thin film SAs; Titanium dioxide film (TiO2F) and Holmium oxide PVA film (HOPF). Such short-pulsed fibre lasers realized by these fibre SAs would have perspective in real applications that require simplicity, mobility and excellent thermal handling for high laser power operations. 2019-08 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/11609/1/Mohd_Fauzi.pdf application/pdf http://studentsrepo.um.edu.my/11609/2/Mohd_Fauzi.pdf Mohd Fauzi , Ab Rahman (2019) Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman. PhD thesis, University of Malaya. http://studentsrepo.um.edu.my/11609/
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Student Repository
url_provider	http://studentsrepo.um.edu.my/
topic	TK Electrical engineering. Electronics Nuclear engineering
spellingShingle	TK Electrical engineering. Electronics Nuclear engineering Mohd Fauzi , Ab Rahman Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman
description	Short-pulsed fibre lasers have received growing attention in the recent years owing to their usefulness in various scientific and industrial applications. In the early years, various saturable absorbers (SAs), mostly thin film SAs have been widely demonstrated. While these film SAs provide low cost fabrication and simple preparation, they have low thermal damage threshold, which limits their ability as portable and robust laser source designs. In comparison, fibre SAs, are much robust, stable and have relatively good thermal handling. In this research work, a compact and stable passively all fibre Q-switched or mode-locked Ytterbium-doped fibre laser (YDFL), Erbium-doped fibre laser (EDFL) as well as Thulium-doped fibre laser (TDFL) were demonstrated by incorporating several short segments of fibre SAs in a forwarded pump ring cavity configuration. These fibre SAs, possess an absorption profile which partly overlaps with the gain medium emission profile, suggesting a possible realization of optical pulses generation. Particularly, in the 1 μm region, several fibre SAs including an 8 cm long Hafnium bismuth erbium co-doped fibre (HBEDF), a 12 cm long Ytterbium-doped fibre (YDF), an 11 cm long Titanium dioxide-doped fibre (TiO2DF), and an 11 cm long Thulium-doped fibre (TDF) were verified, viable of generating Q-switched YDFL. Meanwhile, in the 1.55 μm vicinity, an 11 cm long TDF and an 11 cm long Erbium-doped fibre (EDF) were tested, possible of promoting stable Q-switched EDFL; where a 20 cm long TiO2DF was examined feasible of demonstrating both, Q-switched and mode-locked EDFL. Additionally, in the 2 μm region, an 8 cm long Holmium-doped fibre (HDF) was tested, viable of promoting stable Q-switched and mode-locked TDFL. Experimentally, the fibre SAs (TiO2DF and HDF) were verified, possessing comparable laser performances with the thin film SAs; Titanium dioxide film (TiO2F) and Holmium oxide PVA film (HOPF). Such short-pulsed fibre lasers realized by these fibre SAs would have perspective in real applications that require simplicity, mobility and excellent thermal handling for high laser power operations.
format	Thesis
author	Mohd Fauzi , Ab Rahman
author_facet	Mohd Fauzi , Ab Rahman
author_sort	Mohd Fauzi , Ab Rahman
title	Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman
title_short	Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman
title_full	Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman
title_fullStr	Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman
title_full_unstemmed	Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman
title_sort	fibre-based saturable absorber for generation of short-pulsed fibre lasers / mohd fauzi ab rahman
publishDate	2019
url	http://studentsrepo.um.edu.my/11609/1/Mohd_Fauzi.pdf http://studentsrepo.um.edu.my/11609/2/Mohd_Fauzi.pdf http://studentsrepo.um.edu.my/11609/
_version_	1738506505323282432
score	13.211869

Fibre-based saturable absorber for generation of short-pulsed fibre lasers / Mohd Fauzi Ab Rahman

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