Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber

Pulsed fiber laser has tremendous application in laser processing and laser sensor. The key element to produce a passively Q-switched fiber laser is by using a saturable absorber (SA). Passively Q-switched fiber laser is the most desirable pulse in laser technology due to its ability to generate...

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Main Author:	Nik Mahmud, Nik Noor Haryatul Eleena
Format:	Thesis
Language:	English English English
Published:	2020
Subjects:	QC350-467 Optics Light
Online Access:	http://eprints.uthm.edu.my/405/1/24p%20NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD.pdf http://eprints.uthm.edu.my/405/2/NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD%20WATERMARK.pdf http://eprints.uthm.edu.my/405/3/NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD%20COPYRIGHT%20DECLARATION.pdf
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spelling	my-uthm-ep.4052021-07-25T02:27:54Z Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber 2020-02 Nik Mahmud, Nik Noor Haryatul Eleena QC350-467 Optics. Light Pulsed fiber laser has tremendous application in laser processing and laser sensor. The key element to produce a passively Q-switched fiber laser is by using a saturable absorber (SA). Passively Q-switched fiber laser is the most desirable pulse in laser technology due to its ability to generate optical pulses in microsecond and nanosecond. The aim of this study is to construct a single ring erbium-doped fiber (EDF) laser based on graphite flakes SA to produce short pulse laser. Graphite flakes SA were prepared by mechanical exfoliation techniques and was transferred onto a fiber ferrule tip. The saturable absorption property of the graphite was measured using twin detector method which resulted in a modulation depth of 23.82% with a saturation intensity of 0.031 MW/cm2. Surface morphology, elemental analysis and absorbance characteristics of the graphite flakes were analyzed by the field emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX) and ultraviolet visible spectroscopy (UV-VIS). The result showed that the carbon element on the SA has a very strong peak intensity. The two different EDF coefficient of 6.43 dB/m and 18.93 dB/m (EDF M-5 and EDF I-12) showed a repetition rate of 41.62 kHz and 60.00 kHz with a pulse width of 6.45 μs and 3.38 μs, respectively at a pump power of 268.8 mW. The wavelength tunability of passively Q-switched fiber laser for EDF M-5 and EDF I-12 were optimized at fixed pump power where the tuning range of EDF M-5 occurred between 1544 nm to 1560 nm and 1552 nm to 1570 nm for EDF I-12. The passively Q-switched fiber laser with different EDF coefficients were successfully constructed in a single ring configuration with more selection of wavelength that is up to L band by using higher EDF coefficient. 2020-02 Thesis http://eprints.uthm.edu.my/405/ http://eprints.uthm.edu.my/405/1/24p%20NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD.pdf text en public http://eprints.uthm.edu.my/405/2/NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD%20WATERMARK.pdf text en validuser http://eprints.uthm.edu.my/405/3/NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD%20COPYRIGHT%20DECLARATION.pdf text en staffonly mphil masters Universiti Tun Hussein Onn Malaysia Fakulti Sains Gunaan dan Teknologi
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	QC350-467 Optics Light
spellingShingle	QC350-467 Optics Light Nik Mahmud, Nik Noor Haryatul Eleena Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
description	Pulsed fiber laser has tremendous application in laser processing and laser sensor. The key element to produce a passively Q-switched fiber laser is by using a saturable absorber (SA). Passively Q-switched fiber laser is the most desirable pulse in laser technology due to its ability to generate optical pulses in microsecond and nanosecond. The aim of this study is to construct a single ring erbium-doped fiber (EDF) laser based on graphite flakes SA to produce short pulse laser. Graphite flakes SA were prepared by mechanical exfoliation techniques and was transferred onto a fiber ferrule tip. The saturable absorption property of the graphite was measured using twin detector method which resulted in a modulation depth of 23.82% with a saturation intensity of 0.031 MW/cm2. Surface morphology, elemental analysis and absorbance characteristics of the graphite flakes were analyzed by the field emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX) and ultraviolet visible spectroscopy (UV-VIS). The result showed that the carbon element on the SA has a very strong peak intensity. The two different EDF coefficient of 6.43 dB/m and 18.93 dB/m (EDF M-5 and EDF I-12) showed a repetition rate of 41.62 kHz and 60.00 kHz with a pulse width of 6.45 μs and 3.38 μs, respectively at a pump power of 268.8 mW. The wavelength tunability of passively Q-switched fiber laser for EDF M-5 and EDF I-12 were optimized at fixed pump power where the tuning range of EDF M-5 occurred between 1544 nm to 1560 nm and 1552 nm to 1570 nm for EDF I-12. The passively Q-switched fiber laser with different EDF coefficients were successfully constructed in a single ring configuration with more selection of wavelength that is up to L band by using higher EDF coefficient.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Nik Mahmud, Nik Noor Haryatul Eleena
author_facet	Nik Mahmud, Nik Noor Haryatul Eleena
author_sort	Nik Mahmud, Nik Noor Haryatul Eleena
title	Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
title_short	Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
title_full	Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
title_fullStr	Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
title_full_unstemmed	Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
title_sort	generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Sains Gunaan dan Teknologi
publishDate	2020
url	http://eprints.uthm.edu.my/405/1/24p%20NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD.pdf http://eprints.uthm.edu.my/405/2/NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD%20WATERMARK.pdf http://eprints.uthm.edu.my/405/3/NIK%20NOOR%20HARYATUL%20ELEENA%20NIK%20MAHMUD%20COPYRIGHT%20DECLARATION.pdf
_version_	1747830602079404032

Generation of tunable q-switched erbium-doped fiber laser based on graphite flakes saturable absorber

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