Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan
In this dissertation, we propose to fabricate a higher mechanical strength, polyvinyl alcohol (PVA), type of host material added to the multiwall carbon nanotubes (MWCNTs) powder to significantly increase the capability of Q-switched cavity to generate high energy pulses. MWCNTs-PVA polymer composit...
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| Format: | Thesis |
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2016
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| Online Access: | http://studentsrepo.um.edu.my/6711/ http://studentsrepo.um.edu.my/6711/4/nadhirah.pdf |
| _version_ | 1848773234730729472 |
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| author | Siti Nadhirah, Mohamed Hassan |
| author_facet | Siti Nadhirah, Mohamed Hassan |
| author_sort | Siti Nadhirah, Mohamed Hassan |
| building | UM Research Repository |
| collection | Online Access |
| description | In this dissertation, we propose to fabricate a higher mechanical strength, polyvinyl alcohol (PVA), type of host material added to the multiwall carbon nanotubes (MWCNTs) powder to significantly increase the capability of Q-switched cavity to generate high energy pulses. MWCNTs-PVA polymer composites based thin film is sandwiched between two fiber ferrules as a saturable absorber. MWCNTs concentration of 1.25 wt.% in PVA shows a good consistency in generating pulsed laser in Q-switched regime with a maximum repetition rate of 34.3 kHz, shortest pulse width of 3.49 μs, maximum peak power of 11.69 mW and maximum pulse energy of 43.23 nJ, respectively. Then, 1.125 wt.% of MWCNT/PVA-based Q-switched erbium-doped fiber laser (EDFL) incorporating in laser cavity with a tunable bandpass filter (TBPF) as the wavelength mechanism to achieve a broadband tuning range is proposed and demonstrated. The tuning range of the generated Q-switched pulses covered a wide wavelength range of 50 nm, which spanned from 1519 nm to 1569 nm and corresponded to the S- and C-band regions. The highest pulse energy of 52.13 nJ was obtained at an output wavelength of 1569 nm, with a corresponding repetition rate of 26.53 kHz and pulse width of 6.10 μs, at the maximum power of 114.8 mW. The proposed system which integrates a MWCNTs-PVA based thin film as passive saturable absorber is economical, easy to fabricate and compatible for integration in laser cavity. |
| first_indexed | 2025-11-14T13:39:10Z |
| format | Thesis |
| id | um-6711 |
| institution | University Malaya |
| institution_category | Local University |
| last_indexed | 2025-11-14T13:39:10Z |
| publishDate | 2016 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | um-67112019-09-23T23:32:50Z Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan Siti Nadhirah, Mohamed Hassan Q Science (General) In this dissertation, we propose to fabricate a higher mechanical strength, polyvinyl alcohol (PVA), type of host material added to the multiwall carbon nanotubes (MWCNTs) powder to significantly increase the capability of Q-switched cavity to generate high energy pulses. MWCNTs-PVA polymer composites based thin film is sandwiched between two fiber ferrules as a saturable absorber. MWCNTs concentration of 1.25 wt.% in PVA shows a good consistency in generating pulsed laser in Q-switched regime with a maximum repetition rate of 34.3 kHz, shortest pulse width of 3.49 μs, maximum peak power of 11.69 mW and maximum pulse energy of 43.23 nJ, respectively. Then, 1.125 wt.% of MWCNT/PVA-based Q-switched erbium-doped fiber laser (EDFL) incorporating in laser cavity with a tunable bandpass filter (TBPF) as the wavelength mechanism to achieve a broadband tuning range is proposed and demonstrated. The tuning range of the generated Q-switched pulses covered a wide wavelength range of 50 nm, which spanned from 1519 nm to 1569 nm and corresponded to the S- and C-band regions. The highest pulse energy of 52.13 nJ was obtained at an output wavelength of 1569 nm, with a corresponding repetition rate of 26.53 kHz and pulse width of 6.10 μs, at the maximum power of 114.8 mW. The proposed system which integrates a MWCNTs-PVA based thin film as passive saturable absorber is economical, easy to fabricate and compatible for integration in laser cavity. 2016-07 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/6711/4/nadhirah.pdf Siti Nadhirah, Mohamed Hassan (2016) Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan. Masters thesis, University of Malaya. http://studentsrepo.um.edu.my/6711/ |
| spellingShingle | Q Science (General) Siti Nadhirah, Mohamed Hassan Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan |
| title | Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan |
| title_full | Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan |
| title_fullStr | Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan |
| title_full_unstemmed | Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan |
| title_short | Multiwall carbon nanotube (MWCNT) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (EDFL) / Siti Nadhirah Mohamed Hassan |
| title_sort | multiwall carbon nanotube (mwcnt) as a saturable absorber for generation of high q-factor in erbium doped fiber laser (edfl) / siti nadhirah mohamed hassan |
| topic | Q Science (General) |
| url | http://studentsrepo.um.edu.my/6711/ http://studentsrepo.um.edu.my/6711/4/nadhirah.pdf |