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| 1 | 纳米填料混合物对低密度聚乙烯基复合材料树老化形态的影响(英文)显示文摘This paper deals with a digest on electrical treeing degradation in nanocomposite of magnesium oxide(MgO) added to a low-density polyethylene(LDPE).The objective is to elucidate the'visual'aspects of runaway stage of final treeing breakdown mechanisms,and to ensure that the existence of MgO filler itself is responsible for this aspect instead of voltage application changes.The'visual'aspect of treeing breakdown was investigated by applying ac ramp voltage with continuous rising speed of 0.5 kV/s.As soon as tree had been incepted,the voltage was kept constant to observe the tree propagation until breakdown.The tree propagations were also described by their fractal dimension. To ensure the responsibility of MgO filler on the'visual'aspect results,the experiment was repeated using the same rate of ac ramp voltage.However,as soon as tree had been incepted,the voltage was either increased or decreased to a constant value of mean tree inception voltage obtained from the preceding results to observe its propagation to breakdown. As a result,the tree inception voltage was increased with the filler concentration in LDPE.The filler is considered not only acted as a physical obstacle for tree to propagate,but also as a chemical obstacle in which the free electron might be trapped to cause difficulties for electron avalanche occurrence.This consideration could also be valid for tree propagation up to breakdown.During propagation,due to the filler,the tree structure is accompanied by more branches.Since the branches are closely placed each other,the tree tips become relatively uniform field compares to pure LDPE.This would produce the higher local breakdown strength at the tree tips,leads to the suppression of propagation.The'visual'aspect of breakdown could be achieved by applying voltage exactly at the inception level. After bridging the tree would not breakdown until a short period of time lag.Within this period,the tree channel will be eroded by internal flashover(IFO) and become thicker.MgO filler could still restrain the IFO at the small diameter; however there will be a maximum diameter above which the effect of MgO would be very small.Lastly,it is confirmed that the MgO filler itself excels to suppress the tree degradation instead of the voltage application changes.The polymer nanocomposite appears to be more resistive to treeing degradation than their base material. | Rudi Kurnianto Z.Nawawi H.Ahmad N.Hozumi M.Nagao | 2011 | 高电压技术2011，37，11： | 5 |
| 2 | Graphene-based Q-switched pulsed fiber laser in a linear configuration显示文摘A pulsed laser system is realized with graphene employed as a Q-switch.The graphene is exfoliated from its solution using an optical deposition and the optical tweezer effect.A fiber ferrule that already has the graphene deposited on it is inserted into an erbium-ytterbium laser(EYL)system with linear cavity configuration.We successfully demonstrate a pulsed EYL with a pulse duration of approximately 5.9μs and a repetition rate of 20.0 kHz. | Y.K.Yap Richard M.De La Rue C.H.Pua S.W.Harun H.Ahmad | 2012 | Chinese Optics Letters2012，10，4： | 3 |
| 3 | Q-Switched Erbium-Doped Fiber Laser Using Cadmium Selenide Coated onto Side-Polished D-Shape Fiber as Saturable Absorber显示文摘A stable Q-switched erbium doped fiber laser emitting at 1558 nm is demonstrated using a cadmium selenide(CdSe) material coated onto a side-polished D-shape fiber as the saturable absorber(SA). By elevating the input pump power from the threshold of 91 mW to the maximum available power of 136 mW, a pulse train with a maximum repetition rate of 57.44 kHz, minimum pulse width of 3.76 us, maximum average output power of7.99 mW, maximum pulse energy of 0.1391 uJ, and maximum peak power of 36.99 mW are obtained. The signalto-noise ratio of the spectrum is measured to be around 75 dB. This CdSe based SA is simple, robust, and reliable,and thus suitable for making a portable pulse laser source. | M.F.M.Rusdi M.B.H.Mahyuddin A.A.Latiff H.Ahmad S.W.Harun | 2018 | Chinese Physics Letters2018，35，10： | 2 |
| 4 | Enhancement of Gain in L-Band Bismuth-Based Erbium-Doped Fibre Amplifier Using an Un-pumped EDF and Midway Isolator显示文摘A hybrid L-band erbium-doped fibre amplifier (EDFA) with enhanced gain characteristic is demonstrated without a significant noise figure penalty. It uses a backward C-band amplified stimulated emission from both the ends of a bismuth-based EDFA system to pump an unpumped erbium-doped fibre (EDF) for gain enhancing. The maximum gain enhancement of 4.0dB is obtained at wavelength 1604nm with EDF length of 20m. The gain spectrum is reasonably fiat in this amplifier compared with the amplifier without an EDF. The gain varies from 27.4 dB to 30.2 dB at wavelength region 1564-1608 nm with incorporation of 20 m EDF. Noise figure also varies from 6.0 to 7.TdB at this wavelength region. | W.Y.Chong S.W.Harun H.Ahmad | 2004 | Chinese Physics Letters2004，21，12： | 1 |
| 5 | Tunable passively Q-switched ytterbium-doped fiber laser with mechanically exfoliated GaSe saturable absorber显示文摘A tunable passively Q-switched ytterbium-doped fiber laser using few-layer gallium selenide(GaSe) as a saturable absorber(SA) is demonstrated.The few-layer GaSe SA,which is fabricated by the mechanical exfoliation method,is able to generate a Q-switched fiber laser that has a maximum repetition rate of 92.6 kHz and a minimum pulsed width of 2.3 μs.The highest pulse energy exhibited by the generated pulse is 18.8 nJ with a signal to noise ratio of ~40 dB.The tunability of the proposed laser covers from 1042 to 1082 nm,giving a tuning range of 40 nm. | H.Ahmad S.N.Aidit S.I.Ooi Z.C.Tiu | 2018 | Chinese Optics Letters2018，16，2： | 1 |
| 6 | Graphene Oxide-Based Q-Switched Erbium-Doped Fiber Laser显示文摘We demonstrate a pulsed ring erbium-doped fiber laser based on graphene oxide(GO),employing a simplified Hummer's method to synthesize the GO via chemical oxidation of graphite flakes at room temperature.By dipping a fiber ferrule end face onto the GO suspension,GO is successfully coated onto the end face,making it a simple saturable absorption device.A stable Q-switched pulsed fiber laser is achieved with a low pump threshold of 9.5 mW at 980 nm.The pulse repetition rate ranges from 16.0 to 57.0 kHz.The pulse width and the pulse energy are studied and discussed. | Y.K.Yap N.M.Huang S.W.Harun H.Ahmad | 2013 | Chinese Physics Letters2013，30，2： | 1 |
| 7 | Mode-locked 2 μm fiber laser with a multi-walled carbon nanotube as a saturable absorber显示文摘We propose and demonstrate a passively mode-locked fiber laser operating at 1951.8 nm using a commercial thulium-doped fiber(TDF) laser, a homemade double-clad thulium–ytterbium co-doped fiber(TYDF)as the gain media, and a multi-walled carbon nanotube(MWCNT) based saturable absorber(SA). We prepare the MWCNT composite by mixing a homogeneous solution of MWCNTs with a diluted polyvinyl alcohol(PVA) polymer solution and then drying it at room temperature to form a film. The film is placed between two fiber connectors as a SA before it is integrated into a laser ring cavity. The cavity consists of a 2 m long TDF pumped by a 800 nm laser diode and a 15 m long homemade TYDF pumped by a 905 nm multimode laser diode. A stable mode-locking pulse with a repetition rate of 34.6 MHz and a pulse width of 10.79 ps is obtained when the 905 nm multimode pump power reaches 1.8–2.2 W, while the single-mode 800 nm pump power is fixed at 141.5 m W at all times. To the best of our knowledge, this is the first reported mode-locked fiber laser using a MWCNT-based SA. | S.M.Azooz F.Ahmad H.Ahmad S.W.Harun B.A.Hamida S.Khan A.Halder M.C.Paul M.Pal S.K.Bhadra | 2015 | Chinese Optics Letters2015，13，3： | 1 |
| 8 | Transition Metal Dichalcogenides(WS2 and MoS2)Saturable Absorbers for Mode-Locked Erbium-Doped Fiber Lasers显示文摘We demonstrate an ultrafast fiber laser based on transition metal dichalcogenide materials which are tungsten disulfide(WS2) and molybdenum disulfide(MoS_2) as saturable absorber(SA). These materials are fabricated via a simple drop-casting method. By employing WS_2, we obtain a stable harmonic mode-locking at the threshold pump power of 184 mW, and the generated soliton pulse has 3.48 MHz of repetition rate. At the maximum pump power of 250 mW, we also obtain a small value of pulse duration, 2.43 ps with signal-to-noise ratio(SNR) of 57 dB.For MoS_2 SA, the pulse is generated at 105 mW pump power with repetition rate of 1.16 MHz. However, the pulse duration cannot be detected by the autocorrelator device as the pulse duration recorded is 468 ns, with the SNR value of 35 dB. | N.A.A.Kadir E.I.Ismail A.A.Latiff H.Ahmad H.Arof S.W.Harun | 2017 | Chinese Physics Letters2017，34，1： | 1 |
| 9 | All-fiber, wavelength-tunable ultrafast praseodymium fiber laser显示文摘The interest in tunable ultrafast fiber lasers operating in the 1.3 μm region has seen a significant increase due to rising demands for bandwidth as well as the zero-dispersion characteristic of silica fibers in this wavelength region. In this work, a tunable mode-locked praseodymium-doped fluoride fiber(PDFF) laser using single-walled carbon nanotubes as a saturable absorber is demonstrated. The mode-locked pulses are generated at a central wavelength of 1302 nm with a pulse repetition rate of 5.92 MHz and pulse width of 1.13 ps. The tunability of the mode-locked PDFF laser covers a tuning range of 11 nm. | H.Ahmad S.N.Aidit S.I.Ooi Z.C.Tiu | 2018 | Chinese Optics Letters2018，16，12： | 1 |
| 10 | Multiwavelength generation using an add-drop microring resonator integrated with an InGaAsP/InP sampled grating distributed feedback显示文摘A system of an add-drop microring resonator integrated with a sampled grating distributed feedback(SG-DFB) is investigated via modeling and simulation with the time-domain traveling wave(TDTW)method.The proposed microring resonator comprises a SiO_2 waveguide integrated with an In Ga As P/In P SG-DFB,and the SiO_2 waveguide consists of a silicon core having a refractive index of 3.48 and Kerr coefficient of 4.5 × 10^(-18)m^2∕W.The SG-DFB consists of a series of grating bursts that are constructed using a periodic apodization function with a burst spacing in the grating of 45 μm,a burst length of 5 μm,and 10 bursts across the total length of the SG-DBR.Transmission results of the through and drop port of the microring resonator show the significant capacity enhancement of the generated center wavelengths.The Q-factor of the microring resonator system,defined as the center wavelength(λ0) divided by 3dB FWHM,without and with integration with the SG-DFB is calculated as 1.93 × 105 and 2.87 × 10~5,respectively.Analysis of the dispersion of the system reveals that increasing the wavelength results in a decrease of the dispersion.The higher capacity and efficiency are the advantages of integrating the microring resonator and the In Ga As P/In P SG-DFB. | S.E.Alavi I.S.Amiri M.R.K.Soltanian R.Penny A.S.M.Supa'at H.Ahmad | 2016 | Chinese Optics Letters2016，14，2： | 1 |
| 11 | Q-switched ytterbium doped fiber laser using multi-walled carbon nanotubes saturable absorber显示文摘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 a passive saturable absorber(SA).The saturable absorber is prepared by mixing the MWCNTs homogeneous solution into a dilute PEO polymer solution before it is left to dry at room temperature to produce thin film.Then the film is sandwiched between two FC/PC fiber connectors and integrated into the laser cavity for Q-switching pulse generation.The laser generates a stable pulse operating at wavelength of 1060.2 nm with a threshold pump power of 53.43 mW.The YDFL generates a stable pulse train with repetition rates ranging from7.92 to 24.27 kHz by varying 980-nm pump power from 53.42 to 65.72 mW.At 59.55-mW pump power,the lowest pulse width and the highest pulse energy are obtained at 12.18μs and 143.5 nJ,respectively. | N.Kasim A.H.H.Al-Masoodi F.Ahmad Y.Munajat H.Ahmad S.W.Harun | 2014 | Chinese Optics Letters2014，12，3： | 1 |
| 12 | Q-Switched Raman Fiber Laser with Molybdenum Disulfide-Based Passive Saturable Absorber显示文摘We demonstrate a Q-switched Raman fiber laser using molybdenum disulfide(MoS_2) as a saturable absorber(SA).The SA is assembled by depositing a mechanically exfoliated MoS_2 onto a fiber ferrule facet before it is matched with another clean ferrule via a connector.It is inserted in a Raman fiber laser cavity with a total cavity length of about 8 km to generate a Q-switching pulse train operating at 1560.2 nm.A 7.7-km-long dispersion compensating fiber with 584 ps·nm^(-1)km^(-1) of dispersion is used as a nonlinear gain medium.As the pump power is increased from 395 mW to 422 mW,the repetition rate of the Q-switching pulses can be increased from 132.7 to137.4kHz while the pulse width is concurrently decreased from 3.35μs to 3.03μs.The maximum pulse energy of 54.3nJ is obtained at the maximum pump power of 422 mW.These results show that the mechanically exfoliated MoS_2 SA has a great potential to be used for puise generation in Raman fiber laser systems. | N.Hisamuddin U.N.Zakaria M.Z.Zulkifli A.A.Latiff H.Ahmad S.W.Harun | 2016 | Chinese Physics Letters2016，33，7： | 1 |
| 13 | Q-switched fiber laser using carbon platinum saturable absorber on side-polished fiber显示文摘A 1550 nm Q-switched fiber laser using a carbon platinum saturable absorber deposited on side-polished fiber(SPF) is proposed and demonstrated. The SPF is approximately 2 mm with a polarization-dependent loss(PDL)of 0.4 dB and an insertion loss of 2.5 dB. A stable Q-switched output spectrum is obtained at 1559.34 nm with a peak power of ~6 mW, a pulse width of 1.02 μs, pulse energy of 5.8 nJ, average output power of 0.76 mW, and a repetition rate of 131.6 kHz taken at a pump power of 230.0 mW. A signal-to-noise ratio of 49.62 d B indicates that the Q-switched pulse is highly stable. | H.Ahmad H.Hassan R.Safaei K.Thambiratnam I.S.Amiri | 2017 | Chinese Optics Letters2017，15，9： | 1 |
| 14 | Synthesis and characterization of silica mesoporous material produced by hydrothermal continues pH adjusting path way显示文摘Mesoporous silica molecular sieves MCM-41 were synthesized under hydrothermal conditions. For this purpose, a solution with a molar coefficient of water, cetyltri-methyl ammonium bromide surfactants as template and sodium silicate as the source of SiO_2 are used. Phase formation, morphology and gas absorption properties were investigated by XRD and BET analysis, respectively. The results showed that silica mesoporous material has been successfully synthesized. A favorable special surface and porosity volume together with regular arrangement of nano metric-hexagonal porosities were obtained from this synthesis. Thickness of the wall and average diameter of the pores are 0.8 nm and 4 nm, respectively. | A.Salemi Golezani A.Sharifi Fateh H.Ahmad Mehrabi | 2016 | Progress in Natural Science:Materials International2016，26，4： | 1 |
| 15 | A Q-Switched Erbium-Doped Fiber Laser with a Carbon Nanotube Based Saturable Absorber显示文摘We demonstrate a simple,compact and low cost Q-switched erbium-doped fiber laser(EDFL)using single-wall carbon nanotubes(CNTs)as a saturable absorber for possible applications in metrology,sensing,and medical diagnostics.The EDFL operates at around 1560 nm with repetition rates of 16.1 kHz and 6.4 kHz with saturable absorbers SA1 and SA2 at a pump power of 120 mW.The absorbers are constructed by optically driven deposition and normal deposition techniques.It is observed that the optical deposition method produces a Q-switched EDFL with a lower threshold of 70 mW and better Q-switching performance compared to that of the normal deposition method.The EDFL also has pulse energy of 90.3 nJ and pulse width of 11.6μs at 120 mW pump power. | S.W.Harun M.A.Ismail F.Ahmad M.F.Ismail R.M.Nor N.R.Zulkepely H.Ahmad | 2012 | Chinese Physics Letters2012，29，11： | 0 |
| 16 | Sideband-controllable soliton pulse with bismuth-based erbium-doped fiber显示文摘A sideband-controllable soliton mode-locked erbium-doped fiber laser is successfully demonstrated utilizing the nonlinear polarization rotation technique. The sidebands can be produced or suppressed by performing simple polarization light tuning with a polarization controller. It is believed that the elimination of the sidebands is due to the dispersive waves that are filtered out by the polarization-dependent isolator in the resonator. With the elimination of the Kelly sidebands, the obtained 3 d B bandwidth is 10.6 nm and the attainable pulse duration is0.86 ps. In this experiment, it is proven that the existence of Kelly sidebands limits the attainable pulse duration. | S.J.Tan Z.C.Tiu S.W.Harun H.Ahmad | 2015 | Chinese Optics Letters2015，13，11： | 0 |
| 17 | Titanium dioxide-based Q-switched dual wavelength in the 1 micron region显示文摘In this work a passively Q-switched dual-wavelength ytterbium-doped fiber laser using a titanium dioxide-based saturable absorber is proposed and proven. The system also utilizes a side-polished fiber in a ring cavity configuration to obtain the desired pulse train. A stable dual-wavelength pulse output is obtained at 1034.7and 1039.0 nm, with a maximum pulse energy of 2.0 n J, and a shortest pulse width of 3.2 μs. The generated pulse train is stable, and has a pulse repetition rate from 31.2 to 64.5 kHz. | H.Ahmad M.A.M.Salim Z.A.Ali M.F.Ismail K.Thambiratnam A.A.Latif N.Nayan S.W.Harun | 2016 | Chinese Optics Letters2016，14，9： | 0 |
| 18 | Performance Comparison of Mode-Locked Erbium-Doped Fiber Laser with Nonlinear Polarization Rotation and Saturable Absorber Approaches显示文摘A mode-locked erbium-doped fiber laser (EDFL) is demonstrated using a highly concentrated erbium-doped fiber (EDF) as the gain medium in a ring configuration with and without a saturable absorber (SA).Without the SA,the proposed laser generates soliton pulses with a repetition rate of 12 MHz,pulse width of 1.11 ps and energy pulse of 1.6pJ.By incorporating SA in the ring cavity,the optical output of the laser changes from soliton to stretched pulses due to the slight change in the group velocity dispersion.With the SA,a cleaner pulse is obtained with a repetition rate of 11.3 MHz,a pulse width of 0.58ps and a pulse energy of 2.3pJ. | M.A.Ismail S.J.Tan N.S.Shahabuddin S.W.Harun H.Arof H.Ahmad | 2012 | Chinese Physics Letters2012，29，5： | 0 |
| 19 | Passively Q-switched S-band thulium fluoride fiberlaser with multi-walled carbon nanotube显示文摘A stable, passively Q-switched thulium fluoride fiber laser(TFFL) using a multi-walled carbon nanotube(MWCNT)-based saturable absorber(SA) for operation in the S-band region is proposed and demonstrated.The proposed TFFL has a central lasing wavelength of 1486.4 nm and an input power range of 87.1–126.6 m W.The output pulses have a repetition rate and pulse width range of 30.1–40.0 k Hz and 9.0–3.2 μs, respectively,with a maximum pulse energy of 28.9 n J. This is the first time, to the author's knowledge, of the successful demonstration of a passively Q-switched S-band TFFL using an MWCNT-based SA. | H.Ahmad S.A.Reduan | 2018 | Chinese Optics Letters2018，16，1： | 0 |
| 20 | Optically Modulated Tunable O-Band Praseodymium-Doped Fluoride Fiber Laser Utilizing Multi-Walled Carbon Nanotube Saturable Absorber显示文摘A tunable and optically modulated fiber laser utilizing a multi-walled carbon nanotube based saturable absorber is demonstrated for operation in the O-band region.A praseodymium-doped fluoride fiber is used as the gain medium and the system is capable of generating modulated outputs at 1300 nm.Pulsed output is observed at pump powers of 511 mW and above,with repetition rates and pulse widths that can be tuned from 41 kHz and 3.4μs to 48 kHz and 2.4μs,respectively,at the maximum pump power available.A maximum average output power of 100μW with a corresponding single pulse energy of 2.1 nJ is measured,while the tunability of the proposed laser is from 1290 nm to 1308 nm.The output is stable,with peak power fluctuations of^4 dB from the average value. | H.Ahmad M.F.Ismail S.N.Aidit | 2019 | Chinese Physics Letters2019，36，10： | 0 |
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