A5083139079- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Advanced Fiber Optic Sensors
- Solid State Laser Technologies
- Analytical Chemistry and Sensors
- Photonic and Optical Devices
- Gas Sensing Nanomaterials and Sensors
- Diamond and Carbon-based Materials Research
- Semiconductor Lasers and Optical Devices
- TiO2 Photocatalysis and Solar Cells
- Advanced Photocatalysis Techniques
- Optical Network Technologies
- Advanced Sensor and Energy Harvesting Materials
- Mechanical and Optical Resonators
- Nonlinear Optical Materials Studies
- Transition Metal Oxide Nanomaterials
- Graphene research and applications
- Antenna Design and Analysis
- Electrochemical sensors and biosensors
- Astrophysics and Star Formation Studies
- Sensor Technology and Measurement Systems
- Laser Applications in Dentistry and Medicine
- Conducting polymers and applications
- Advanced Photonic Communication Systems
University of Technology Malaysia
2015-2024
University of Kuala Lumpur
2015-2024
University of Malaya
2008-2019
Universiti Putra Malaysia
2019
Thomas More Universitas
2017
We demonstrate a simple, compact and low cost Q-switched erbium-doped fiber laser (EDFL) using single-wall carbon nanotubes (CNTs) as saturable absorber for possible applications in metrology, sensing, medical diagnostics. The EDFL operates at around 1560 nm with repetition rates of 16.1 kHz 6.4 absorbers SA1 SA2 pump power 120 mW. are constructed by optically driven deposition normal techniques. It is observed that the optical method produces lower threshold 70 mW better Q-switching...
We demonstrate a simple and low cost mode-locked erbium-doped fiber laser (EDFL) operating in the nanosecond region using single-walled carbon nanotube (SWCNT)-based saturable absorber (SA). A droplet of SWCNT solution is applied on end ferrule, which then mated to another clean connector ferrule construct an SA. Then SA integrated into ring EDFL cavity for pulse generation. The operates at around 1570.4 nm, with soliton-like spectrum small Kelly sidebands, confirms attainment anomalous...
We demonstrate a simple, compact and low cost Q-switched erbium-doped fiber laser (EDFL) exploiting graphene saturable absorber (GSA) for possible applications in metrology, sensing medical diagnostics. The EDFL operates at 1560 nm with repetition rates of 31.3 kHz 25 GSA1 GSA2, respectively, pump power 120 mW. rate is smaller lower power. It has pulse width 7.5 μs energy 43.7 nJ GSA2 mW also observed that thicker layer produces threshold higher output energy, but width.
A simple tapered plastic optical fiber (POF) sensor is proposed and demonstrated for the detection of uric acid concentrations in deionized water. The uses a POF probe coated with different graphene polymer composite. fabricated using an etching method has waist diameter 0.45 mm tapering length 10 mm. coating improves sensitivity as it changes effective refractive index cladding allows more lights to be transmitted from fiber. immersed solution senses relative concentration intensity...
The incoming 5G technology requires antennas with a greater capacity, wider wireless spectrum utilisation, high gain, and steer-ability. This is due to the cramped utilisation in previous generation. As matter of fact, conventional are unable serve new frequency limitations fabrication installation mainly for smaller sizes. use graphene material promises sizes thinner dimensions, yet capable emitting higher frequencies. Hence, were studied at 15 GHz both single array elements. high-frequency...
In this work, a Q-switched fiber laser is demonstrated using quantum dots (QDs) cadmium sulfide (CdS) as saturable absorber (SA) in an erbium-doped (EDFL) system. The QD CdS synthesized via the microwave hydrothermal assisted method and embedded into polyvinyl alcohol (PVA). CdS/PVA matrix film sandwiched between two ferrules by adapter. generation of having repetition rate, pulse width, peak-to-peak duration 75.19 kHz, 1.27 μs, 13.32 respectively. maximum output power 3.82 mW energy 50.8 nJ...
Abstract This paper demonstrates and characterizes a tunable wavelength ultrafast erbium-doped fiber laser (EDFL), enabled by bandpass filter (TBF) mode-locked with graphene thin film as the saturable absorber. The laser’s can be continuously tuned from 1507.5 nm to 1571.3 nm, covering broad range of 63.8 nm. Fourteen distinct wavelengths, spaced at 5 intervals, are recorded. variation in bandwidth pulse width across these wavelengths reveals values ranging 0.5 0.8 3.9 ps 6.6 ps,...
A Q-switched ytterbium-doped fiber laser (YDFL) is proposed and demonstrated using a newly developed multi-walled carbon nanotubes polyethylene oxide (MWCNTs-PEO) film as passive saturable absorber (SA).The prepared by mixing the MWCNTs homogeneous solution into dilute PEO polymer before it left to dry at room temperature produce thin film.Then sandwiched between two FC/PC connectors integrated cavity for Q-switching pulse generation.The generates stable operating wavelength of 1060.2 nm...
An optical fiber humidity sensor was fabricated using a hydrophilic gel (agarose) deposited on the tapered plastic (POF). The sensing element, agarose, can absorb and exude moisture from/to ambience, thereby altering its refractive index changing ability to modulate intensity of light that propagates through fiber. Thus, operating principle is based modulation technique, which utilizes POF probe coated with agarose sensitive humidity. POF, an etching method, has waist diameter 0.45 mm...
This study investigated the different thicknesses of TiO2 photoanode films and effect surface plasmon resonance (SPR) Ag-TiO2 nanocomposites on current-voltage (I-V) performance dye-sensitized solar cells (DSSC). The layer was deposited using doctor blade technique thickness controlled by a number Scotch tape layers. silver nanoparticles (AgNP) were synthesised chemical reduction method concentration sodium citrate as reducing agent varied from 4 to 12 mM ion size nanoparticles. nanopowder...
This study investigated the generation of Q-switched pulse in fibre laser operation at 1550 nm wavelength region using silver nanoparticles (Ag NPs) as passive saturable absorber (SA). The Ag NP SA was prepared through electron beam evaporation method with a thickness 10 on pure polyvinyl alcohol (PVA) film. average size NPs around 50 and existence element had been by energy dispersive spectroscopy (EDS) technique. modulation depth developed silver-based 19% saturation intensity 170.26...
A simple humidity sensor is proposed and demonstrated using a tapered plastic optical fiber (POF) as probe. Its operation based on intensity modulation technique POF probe coated with polymer blend of hydroxyethylcellulose/polyvinylidenefluoride (HEC/PVDF) composite that acts the sensitive cladding. The fabricated an etching method has waist diameter 0.45 mm tapering length 10 mm. As relative varies from 50% to 85%, output voltage increases linearly 0.32 1.25 mV. HEC/PVDF composite-coated...
We report a ring cavity passively harmonic mode-locked thulium-doped fiber laser (TDFL) using newly developed single-wall carbon nanotube-based saturable absorber. The TDFL generates the 25th stretched pulse train with high repetition rate of 213 MHz and duration 710 fs. operates at 1901.6 nm an average power 1.89 mW, which corresponds to energy 0.008 nJ, 1552 pump 719 mW. peak-to-background ratio is measured be 60 dB, indicates stability laser.
The Q-switched pulse regime is demonstrated by integrating conductive graphene as passive saturable absorber producing relatively high instantaneous peak power and energy. fabricated investigated using Raman spectroscopy. single wavelength Q-switching operates at 1558.28 nm maximum input pump of 151.47 mW. As the increased from threshold 51.6 mW to mW, train repetition rate increases proportionally 47.94 kHz 67.8 while width reduced 9.58 μs 6.02 μs. generated stable produced energy 32 206...