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Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin

Cost-efficient, robust, and stable pulse laser systems are vital for a wide range of applications ranging from optical communication to sensing. This thesis aims to construct practical Q-switched and mode-locked Zirconia-Yttria Erbium-Doped Fiber Laser (Z-EDFL) operating in 1550 nm region using the...

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Main Author: Raja Zaimas Rosdin , Raja Rosdin
Format: Thesis
Published: 2023
Subjects:
TK Electrical engineering. Electronics Nuclear engineering
Online Access:http://studentsrepo.um.edu.my/15056/1/Raja_Zaimas_Rosdin.pdf
http://studentsrepo.um.edu.my/15056/2/Raja_Zaimas_Rosdin.pdf
http://studentsrepo.um.edu.my/15056/
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spelling my.um.stud.150562024-11-13T23:31:55Z Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin Raja Zaimas Rosdin , Raja Rosdin TK Electrical engineering. Electronics Nuclear engineering Cost-efficient, robust, and stable pulse laser systems are vital for a wide range of applications ranging from optical communication to sensing. This thesis aims to construct practical Q-switched and mode-locked Zirconia-Yttria Erbium-Doped Fiber Laser (Z-EDFL) operating in 1550 nm region using the new saturable absorbers (SAs). Five new SA devices were successfully explored in this work: gold nanoparticles (GNP), silver nanoparticles (SNP), Bismuth tellurite (Bi2Te3), Thulium doped fiber (TDF) and Bismuth-doped fiber (BiDF). For instance, GNP was prepared through sodium borohydrate reduction method and incorporated into an EDFL cavity to generate Q-switched pulses at 1566.7 nm. The Q-switched EDFL produced self-started pulse train with a repetition rate that is tuned from 8.1 to 18.2 kHz as the 980 nm pump power is increased from 83.6 mW to 153.5 mW. At maximum pump power, the laser produced a Q-switching pulse train with the minimum pulse duration and the maximum pulse energyof 25.8 μs and 87.9 nJ, respectively. By adding 200 m long SMF into the same cavity, a mode-locked nanosecond pulses train was also obtained. The nanosecond pulses operate at 1561.5 nm with pulse duration of 202 ns and a fundamental repetition rate of 1.0 MHz. The maximum pulses energy of 199 nJ was observed at 147.2 mW pump power. Dark pulse generation was also successfully achieved by using Bi2Te3 or BiDF based SA in highly nonlinear EDFL cavity with Z-EDF gain medium. For instance, the laser generated a dark pulse with multi-wavelength emission, centered at 1592.68 nm by exploiting the effect of saturable absorption of Bi2Te3 and high nonlinearity of Z-EDF. The laser operated at pulse repetition frequency of 1.0 MHz with a pulse width of 215 ns. These results indicate that the developed SAs have a great potential for fiber laser applications. 2023-01 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/15056/1/Raja_Zaimas_Rosdin.pdf application/pdf http://studentsrepo.um.edu.my/15056/2/Raja_Zaimas_Rosdin.pdf Raja Zaimas Rosdin , Raja Rosdin (2023) Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin. PhD thesis, Universiti Malaya. http://studentsrepo.um.edu.my/15056/
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
Raja Zaimas Rosdin , Raja Rosdin
Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin
description Cost-efficient, robust, and stable pulse laser systems are vital for a wide range of applications ranging from optical communication to sensing. This thesis aims to construct practical Q-switched and mode-locked Zirconia-Yttria Erbium-Doped Fiber Laser (Z-EDFL) operating in 1550 nm region using the new saturable absorbers (SAs). Five new SA devices were successfully explored in this work: gold nanoparticles (GNP), silver nanoparticles (SNP), Bismuth tellurite (Bi2Te3), Thulium doped fiber (TDF) and Bismuth-doped fiber (BiDF). For instance, GNP was prepared through sodium borohydrate reduction method and incorporated into an EDFL cavity to generate Q-switched pulses at 1566.7 nm. The Q-switched EDFL produced self-started pulse train with a repetition rate that is tuned from 8.1 to 18.2 kHz as the 980 nm pump power is increased from 83.6 mW to 153.5 mW. At maximum pump power, the laser produced a Q-switching pulse train with the minimum pulse duration and the maximum pulse energyof 25.8 μs and 87.9 nJ, respectively. By adding 200 m long SMF into the same cavity, a mode-locked nanosecond pulses train was also obtained. The nanosecond pulses operate at 1561.5 nm with pulse duration of 202 ns and a fundamental repetition rate of 1.0 MHz. The maximum pulses energy of 199 nJ was observed at 147.2 mW pump power. Dark pulse generation was also successfully achieved by using Bi2Te3 or BiDF based SA in highly nonlinear EDFL cavity with Z-EDF gain medium. For instance, the laser generated a dark pulse with multi-wavelength emission, centered at 1592.68 nm by exploiting the effect of saturable absorption of Bi2Te3 and high nonlinearity of Z-EDF. The laser operated at pulse repetition frequency of 1.0 MHz with a pulse width of 215 ns. These results indicate that the developed SAs have a great potential for fiber laser applications.
format Thesis
author Raja Zaimas Rosdin , Raja Rosdin
author_facet Raja Zaimas Rosdin , Raja Rosdin
author_sort Raja Zaimas Rosdin , Raja Rosdin
title Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin
title_short Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin
title_full Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin
title_fullStr Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin
title_full_unstemmed Passively Q-switched and mode-locked zirconia Yttria erbium-doped fiber laser / Raja Zaimas Rosdin Raja Rosdin
title_sort passively q-switched and mode-locked zirconia yttria erbium-doped fiber laser / raja zaimas rosdin raja rosdin
publishDate 2023
url http://studentsrepo.um.edu.my/15056/1/Raja_Zaimas_Rosdin.pdf
http://studentsrepo.um.edu.my/15056/2/Raja_Zaimas_Rosdin.pdf
http://studentsrepo.um.edu.my/15056/
_version_ 1817842503999553536
score 13.244413

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