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Generation of Q-Switched Mode-Locked Erbium-Doped Fiber Laser Operating in Dark Regime

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Chinese Physics Letters 2016年第3期33卷 32-35页

作者： Zian Cheak Tiu Arman Zarei Harith Ahmad sulaiman wadi harun Photonics Research Center University of Malaya Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya

We demonstrate a stable Q-switched mode-locked erbium-doped fiber laser （EDFL） operating in dark regime based on the nonlinear polarization rotation technique. The EDFL produces a pulse train where the Q-switching envelope is formed by multiple dark pulses. The repetition rate of the Q-switched envelope can be increased from 0.96kHz to 3.26kHz, whereas the pulse width reduces from 211 #s to 86#s. The highest pulse of 479nJ is obtained at the pump power of 55 mW. It is also observed that the dark pulses inside the Q-switching envelope consist of two parts： square and trailing dark pulses. The shortest pulse width of the dark square pulse is obtained at 40.5μs when the pump power is fixed at 145mW. The repetition rate of trailing dark pulses can be increased from 27.62kHz to 50kHz as the pump power increases from 55mW to 145mW.

关键词： of on is as Generation of Q-Switched Mode-Locked Erbium-Doped Fiber Laser Operating in Dark Regime in

Q-Switching Pulse Generation with Thulium-Doped Fiber Saturable Absorber

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Chinese Physics Letters 2014年第12期31卷 56-58页

作者： Zian Cheak Tiui Arman Zarei Sin Jin Tan Harith Ahmad sulaiman wadi harun Department of Electrical Engineering Faculty of Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Center University of Malaya Kuala Lumpur 50603 Malaysia School of Engineering KDU University College SS22/41 Damansara Jaya PetMing Jaya 47400 Selangor Darul Ehsan Malaysia

Q-switched pulsed laser systems operating in the eye-safe wavelength region （λ〉 1.4 μm） are promis- ing for applications such as light detection and ranging （lidar）, differential absorption lidar, optical communi- cation, sensor and instrumentations. Fiber lasers are particularly attractive for such applications due to the fact that the beam quality can be independent of output power and they can be robustly engineered. There is an increasing interest in Q-switched erbium- doped fiber lasers （EDFLs）, which can be generated by using either active or passive techniques. Com- pared with the actively Q-switched ones, passively Q- switched EDFLs have attracted much attention for their advantages of compactness, low cost, flexibility and simplicity of design. Different kinds of saturable absorbers, such as the transition metal-doped crys- tals and semiconductor quantum-well structures, have been applied to realize Q-switched ***- ever, when they are used in the laser cavity, additional alignment devices, such as lens, mirrors or U-bench units, have to be applied. This may increase the in- sertion loss and the complexity of the laser cavity.

关键词： Q-switching THULIUM DOPED semiconductors FIBER lasers ABSORPTION LASER pumping

Nonlinear Polarization Rotation-Based Mode-Locked Erbium-Doped Fiber Laser with Three Switchable Operation States

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Chinese Physics Letters 2014年第9期31卷 76-78页

作者： Zian Cheak Tiu Sin Jin Tan Arman Zarei Harith Ahmad sulaiman wadi harun Department of Electrical Engineering Faculty of Engineering University of Malaya Kuala Lumpur 0603 Malaysia Photonics Research Center University of Malaya Kuala Lumpur 50603 Malaysia School of Engineering KDu University Collegel Petaling Jaya 47400 Malaysia

A simple mode-locked erbium-doped fiber laser （EDFL） with three switchable operation states is proposed and demonstrated based on nonlinear polarization rotation. The EDFL generates a stable square pulse at a third harmonic pulse repetition rate of 87kHz as the 1480 nm pump power increases from the threshold of 17.5 m W to 34.3mW. The square pulse duration increases from 105 ns to 245ns as the pump power increases within this region. The pulse operation switches to the second operation state as the pump power is varied from 48.2mW to *** W. The laser operates at a fundamental repetition rate of 29 kHz with a fixed pulse width of 8.5 μs within the pump power region. At a pump power of ***, the average output power is 3.84mW, which corresponds to the pulse energy of 131.5 ng. When the pump power continues to increase, the pulse train experiences unstable oscillation before it reaches the third stable operation state within a pump power region of 138.9 m W to 145.0 m W. Within this region, the EDFL produces a fixed pulse width of 2.8 μs and a harmonic pulse repetition rate of 58 kHz.

关键词： NONLINEAR theories RESEARCH POLARIZATION (Nuclear physics) FIBER lasers HARMONICS (Electric waves) ERBIUM

Harmonic Dark Pulse Emission in Erbium-Doped Fiber Laser

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Chinese Physics Letters 2015年第3期32卷 49-51页

作者： Zian Cheak Tiu Arman Zarei Sin Jin Tan Harith Ahmad sulaiman wadi harun Department of ElectricM Engineering Faculty of Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Center University of Malaya Kuala Lumpur 50603 Malaysia School Of Engineering KDU University College Petaling Jaya 47400 Malaysia

A harmonic dark pulse generation in an erbium-doped fiber laser is demonstrated based on a figure-of-eight configuration. It is found that the harmonic dark pulse can be shifted from the fundamental to the 5th order harmonic by increasing the pump power with an appropriate polarization controller orientation. The fundamental repetition rate of 2O kHz is obtained at the pump power of 29 m W. The highest pulse energy of 42.6 n3 is obtained at the fundamental repetition rate. The operating frequency of the dark pulse trains shifts to 2nd, 3rd, 4th and 5th harmonic as the pump powers are increased to 34mW, 50mW, 59mW and 137mW, respectively.

关键词： Harmonic Dark Pulse Emission in Erbium-Doped Fiber Laser EDF DSF kHz

Numerical analysis of a Kretschmann surface plasmon resonance sensor with silver/TiO_(2)/BaTiO_(3)/silver/graphene for refractive index sensing

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Optoelectronics Letters 2023年第10期19卷 583-586页

作者： Huda A.Zain Malathy Batumalay Hazli R.A.Rahim sulaiman wadi harun Department of Electrical Engineering University of MalayaKuala Lumpur50603Malaysia Faculty of Data Science&IT INTI International UniversityNilaiNegeri Sembilan71800Malaysia Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia MelakaMelakaMalaysia

The sensitivity of a Kretschmann surface plasmon resonance(SPR)sensor was *** Kretschmann setup had multiple layers,a BK7 prism,silver,barium titanate(BaTiO_(3)),titanium dioxide(TiO_(2)),and *** BaTiO_(3)and TiO_(2)coatings were sandwiched between two silver *** sensitivity of 260°/RIU has been *** graphene layers are added to the configuration to improve sensitivity and as a bio-compatibility *** configuration can be used for biochemical sensors.

关键词： silver surface resonance

Ring microfiber coupler erbium-doped fiber laser analysis

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Chinese Optics Letters 2014年第2期12卷 42-45页

作者： Azlan sulaiman sulaiman wadi harun Harith Ahmad Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya Photonic Research Center Department of PhysicsUniversity Malaya

A non-adiabatic microfiber coupler is fabricated by flame brushing technique and then theoretically and experimentally *** effective length of the microfiber coupler is determined by simulation,and a low-noise laser is demonstrated using various lengths of erbium-doped fiber（EDF） when incorporated in a laser *** 18.6-mW input pump power,the maximum output power of 20 μW and the lowest lasing threshold of 3.8 mW are obtained with a 90-cm-long EDF.

关键词： length EDF MFC Ring microfiber coupler erbium-doped fiber laser analysis mode

Agarose coated micro-bottle sensor for relative humidity detection

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Optoelectronics Letters 2021年第6期17卷 328-333页

作者： Huda Adnan Zain Malathy Batumalay Md Ashadi Md Johari Kaharudin Dimyati sulaiman wadi harun Department of Electrical Physics University of MalayaKuala Lumpur 50603Malaysia Faculty of Information Technology INTI International UniversityNilai 71800Malaysia Faculty of Electrical and Electronic Engineering Technology Universiti Teknikal Malaysia MelakaMelaka 76100Malaysia Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

The whispering gallery mode(WGM)based micro-bottle resonator(MBR)sensor has been proposed and demonstrated for relative humidity measurement by using an agarose gel as a *** was fabricated by using a soften-and-compress method to form a 190μm bulge *** micro-bottle was optically excited by a 3μm tapered fiber and it exhibits a resonance with a Q factor in an order of 10^(5).The agarose coated MBR produces a good sensing response towards humidity with the sensitivity of 0.107 d B/%RH and linearity of 99.614%.The agarose hydrophilic nature and its changing porosity and refractive index with increasing relative humidity made the coated MBR structure to be more sensitive than the uncoated *** humidity sensor has a simple fabrication and is showing good sensitivity,linearity,resolution,response time and operational in a wide humidity range.

关键词： structure. humidity bottle

Single-walled carbon nanotubes coated D-shaped fiber for aqueous ethanol detection

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Optoelectronics Letters 2022年第7期18卷 430-433页

作者： Huda Adnan Zain Malathy Batumalay Hazli Rafis Abdul Rahim Moh Yasin sulaiman wadi harun Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Faculty of Information Technology INTI International UniversityNilai 71800Malaysia Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia MelakaMelakaMalaysia Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

In this letter,single-walled carbon nanotubes(SWCNT)coating was used on the D-shaped silica fiber for ethanol sensing in aqueous *** performance of this structure as an ethanol sensor was studied here by monitoring output power variation and wavelength shift with changing ethanol *** the concentration range of 5%—50%of ethanol,the SWCNT coated structure showed an improved sensitivity compared to the uncoated *** sensitivity is improved from 0.0135 dB/%to 0.0409 dB/%with the *** SWCNT coated sample also showed a peak wavelength shift of 0.1 nm with the change of ethanol concentration in the same range.

关键词： shaped fiber walled

Gold nanoparticles film for Q-switched pulse generation in thulium doped fiber laser cavity

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Optoelectronics Letters 2021年第8期17卷 449-453页

作者： Ahmad H.A.Rosol Afiq A.A.Jafry Norrima Mokhtar Moh Yasin sulaiman wadi harun Department of Electrical Engineering University of MalayaKuala Lumpur 50603Malaysia Department of Physics Faculty of ScienceUniversiti Teknologi MalaysiaSkudai 81310Malaysia Department of Physics Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

Passively Q-switched thulium doped fiber laser(TDFL)has been successfully demonstrated using gold nanoparticles(GNPs),which were embedded into polyvinyl alcohol as saturable absorber(SA).The stable self-starting Q-switched laser was generated to operate at 1891 nm when a tiny piece of the prepared film was slot in between two fiber ferrules and incorporated into the laser *** repetition rate can be adjusted from 48.54 kHz to 49.64 kHz while the pulse width decreased from 3.52μs to 2.38μs with the increase of 1550 nm pump power from 840 m W to 930 m *** corresponding pump power output power linearly increased from 3.62 m W to 6.3 m W with a slope efficiency of 2.53%.The maximum peak power and pulse energy were recorded at about 39 m W and 0.12μJ,respectively at pump power of 930 m *** Q-switching operation was caused by the surface plasmon resonance absorption of GNPs.

关键词： switched fiber pump