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Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber

An ultrashort pulse fiber laser has been proposed due to the problem of bulky size and high cost of the Titanium Sapphire laser and other commercial ultrashort pulse fiber lasers. Thus, this study focused on the development of a robust, compact and stable femtosecond mode-locked fiber laser via opti...

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Main Author: Mat Rifin, Siti Norfarha
Format: Thesis
Language:English
Published: 2017
Subjects:
QC Physics
Online Access:http://eprints.utm.my/id/eprint/79530/1/SitiNorfarhaMatRifinPFS2017.pdf
http://eprints.utm.my/id/eprint/79530/
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spelling my.utm.795302018-10-31T12:58:09Z http://eprints.utm.my/id/eprint/79530/ Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber Mat Rifin, Siti Norfarha QC Physics An ultrashort pulse fiber laser has been proposed due to the problem of bulky size and high cost of the Titanium Sapphire laser and other commercial ultrashort pulse fiber lasers. Thus, this study focused on the development of a robust, compact and stable femtosecond mode-locked fiber laser via optical telecommunication components. This laser was designed to have a high repetition rate (80 - 100 MHz) and average output power (30 - 50 mW), and also a narrow pulse width (< 100 fs) which are crucial for a laser source used in all-fiber terahertz time domain spectroscopy system. A short cavity was needed in order to get a high repetition rate while the effect of optical dispersion in the cavity was included in order to produce a narrow pulse width. This design employed a passive mode-locked technique with a carbon nanotube thin film as the saturable absorber. Initially, a diode laser of 980 nm wavelength was used as a pumping source and a 0.4 m long of highly erbium-doped fiber with 110 dB/m peak absorption at wavelength of 1530 nm was utilised as a gain medium. Then, in order to achieve the desired parameters, the pump power was increased to raise the repetition rate of the pulse laser and a supercontinuum generation technique was adopted to compress the pulse width. The preliminary results of the designed laser show a fundamental repetition rate of 67.8 MHz at mode-locking threshold pump power of 63.5 mW. The average output power and pulse width obtained are 0.77 mW and 410 fs respectively. The increment of pump power to 104.2 mW significantly increased the fundamental repetition rate to 193.5 MHz which corresponds to the 3rd order harmonic and compressed the pulse width to 70 fs. The average output power after compressing the pulse width is 4.27 mW. As the conclusion, two of the targeted parameters of the laser have been successfully attained. This design however has not been able to produce the targeted average output power and to operate with the desired parameters simultaneously. 2017 Thesis NonPeerReviewed application/pdf en http://eprints.utm.my/id/eprint/79530/1/SitiNorfarhaMatRifinPFS2017.pdf Mat Rifin, Siti Norfarha (2017) Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber. PhD thesis, Universiti Teknologi Malaysia, Faculty of Science.
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic QC Physics
spellingShingle QC Physics
Mat Rifin, Siti Norfarha
Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber
description An ultrashort pulse fiber laser has been proposed due to the problem of bulky size and high cost of the Titanium Sapphire laser and other commercial ultrashort pulse fiber lasers. Thus, this study focused on the development of a robust, compact and stable femtosecond mode-locked fiber laser via optical telecommunication components. This laser was designed to have a high repetition rate (80 - 100 MHz) and average output power (30 - 50 mW), and also a narrow pulse width (< 100 fs) which are crucial for a laser source used in all-fiber terahertz time domain spectroscopy system. A short cavity was needed in order to get a high repetition rate while the effect of optical dispersion in the cavity was included in order to produce a narrow pulse width. This design employed a passive mode-locked technique with a carbon nanotube thin film as the saturable absorber. Initially, a diode laser of 980 nm wavelength was used as a pumping source and a 0.4 m long of highly erbium-doped fiber with 110 dB/m peak absorption at wavelength of 1530 nm was utilised as a gain medium. Then, in order to achieve the desired parameters, the pump power was increased to raise the repetition rate of the pulse laser and a supercontinuum generation technique was adopted to compress the pulse width. The preliminary results of the designed laser show a fundamental repetition rate of 67.8 MHz at mode-locking threshold pump power of 63.5 mW. The average output power and pulse width obtained are 0.77 mW and 410 fs respectively. The increment of pump power to 104.2 mW significantly increased the fundamental repetition rate to 193.5 MHz which corresponds to the 3rd order harmonic and compressed the pulse width to 70 fs. The average output power after compressing the pulse width is 4.27 mW. As the conclusion, two of the targeted parameters of the laser have been successfully attained. This design however has not been able to produce the targeted average output power and to operate with the desired parameters simultaneously.
format Thesis
author Mat Rifin, Siti Norfarha
author_facet Mat Rifin, Siti Norfarha
author_sort Mat Rifin, Siti Norfarha
title Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber
title_short Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber
title_full Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber
title_fullStr Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber
title_full_unstemmed Harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber
title_sort harmonic femtosecond fiber laser based on supercontinuum generation with carbon nanotubes saturable absorber
publishDate 2017
url http://eprints.utm.my/id/eprint/79530/1/SitiNorfarhaMatRifinPFS2017.pdf
http://eprints.utm.my/id/eprint/79530/
_version_ 1643658221530906624
score 13.211869

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