Cherrie Lee , Sue Jing (2018) ZNO nanoparticles as saturable absorber for passively Q-switched fiber laser in C-and S-band / Cherrie Lee Sue Jing. Masters thesis, Universiti Malaya.
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Abstract
This work investigates the characteristics of pulses generated via passive Q-switching in S- and C-band using zinc oxide nanoparticles as saturable absorber. Unlike active Q switching, passive Q-switching is a cheaper and simpler alternative to obtain pulses with repetition rates in the range of kilohertz and pulse width of mircoseconds. There are several techniques to obtain passively Q-switched laser such as the employment of nonlinear polarization rotation (NPR), semiconductor saturable absorber (SESAM), carbon-based saturable absorber (single-walled carbon nanotubes (SWCNT), graphene and graphene oxide) and transition metal-dichalcogenides saturable absorber (molybdenum disulfide, molybdenum diselenide, tungsten disulfide and tungsten diselenide). Nanomaterials such as zinc oxide nanoparticles have distinctive optical, electronic and mechanical properties which made them a suitable candidate as a saturable absorber (SA) for passively Q-switched laser. Erbium-doped fiber (EDF) is used as the gain medium in the laser cavity to obtain Q-switched pulses in C-band. C-band is the most commonly used wavelength in optical communications. Due to increasing data traffic, there is a demand to expand the optical network to other bands to reduce network congestion. One of the bands being considered to accommodate this expansion is S-band. Depressed-cladding erbium-doped fiber (DC-EDF) is used as the gain medium in the laser cavity to obtain Q-switched pulses in S-band. The tuning range of these pulses in C-band and S-band are also investigated. The results obtained from this work is instrumental as Q-switched lasers are widely used in many applications such as aesthetic treatment, biomedical diagnostic, remote-sensing and telecommunications.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | Dissertation (M.A.) – Institute of Graduate Studies, Universiti Malaya, 2018. |
| Uncontrolled Keywords: | Q-switching; Fiber laser; Tunable laser; Nanomaterials; Zinc oxide |
| Subjects: | Q Science > Q Science (General) Q Science > QC Physics |
| Divisions: | Institute of Graduate Studies |
| Depositing User: | Mr Mohd Safri Tahir |
| Date Deposited: | 01 Nov 2021 08:11 |
| Last Modified: | 01 Nov 2021 08:11 |
| URI: | http://studentsrepo.um.edu.my/id/eprint/12489 |
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