Article
Biochemistry & Molecular Biology
Ping Hu, Jiajia Mao, Hongkun Nie, Ruihua Wang, Baitao Zhang, Tao Li, Jingliang He, Kejian Yang
Summary: A saturable absorber (SA) based on niobium diselenide (NbSe2) was fabricated using optically driven deposition method, showing excellent nonlinear optical properties and successfully applied in a stable passively Q-switched erbium-doped all-fiber laser, achieving the shortest pulse duration and highest pulse energy ever reported for an NbSe2 SA in a Q-switched fiber laser.
Article
Engineering, Electrical & Electronic
Congcong Liu, Qiaoqiao Xu, Zhuo Li, Jiangyong He, Pan Wang, Yi Huang, Yange Liu, Zhi Wang
Summary: This study presents a Q-switched Er-doped all-fiber laser utilizing a Ti3C2Tx saturable absorber, which demonstrates stable operation with excellent modulation depth, repetition frequency, and output power stability.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Optics
Zengrun Wen, Kaile Wang, Shuangcheng Chen, Haowei Chen, Xinyuan Qi, Baole Lu, Jintao Bai
Summary: In this study, a narrow spectral bandwidth EDF Q-switched laser is proposed, integrating saturable absorption and spectral filtering effects using SDIG. The spectral width of the Q-switched emissions is determined by the length of SDIG and pump power. The method provides a simple way to obtain Q-switched pulses with narrow bandwidths for various applications.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
Lei Liang, Kexin Yao, Nan Liu, Yingle Shi, Yipeng Zheng, Kaili Ren, Qiyi Zhao, Lu Li, Dongdong Han
Summary: In this study, GaSb is used as a saturable absorber (SA) material in an Er-doped fiber (EDF) laser. The GaSb-based SA is prepared through magnetron sputtering deposition technology. Under the Q-switching working state, the repetition frequency is tuned and the pulse duration is changed, yielding stable laser pulses.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
H. Ahmad, M. F. M. Azri, S. N. Aidit, N. Yusoff, A. K. Zamzuri, M. Z. Samion, S. Wang, Y. Wang, J. K. Sahu
Summary: A novel tunable passively Q-switched fiber laser operating at a wavelength of 1.3 μm was demonstrated, utilizing BDF and Nb2C technology, achieving frequency adjustment in the desired wavelength region.
Article
Optics
Dalin Sun, Xintong Xu, Jiaqi Chen, Wentao Shi, Lang Sun, Shaowen Chu, Shuangchen Ruan
Summary: Researchers successfully utilized single-walled carbon nanotubes as a saturable absorber to achieve an all-fiber passively Q-switched ytterbium-doped fiber laser. By doping Zn2+ metal cations, the filling density and quality of the single-walled carbon nanotubes were improved. A stable Q-switched pulse train was successfully obtained at a wavelength of 1039.4 nm with a repetition rate of 54.28 kHz.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Y. R. Yuzaile, Z. Zakaria, N. A. Awang, N. U. H. H. Zalkepali
Summary: This study investigates the influence of different plasma sputtering times on the performance of platinum saturable absorbers in Q-switched erbium-doped fiber lasers. The best performance was achieved with 50 seconds of sputtering time, resulting in optimal bandwidth and pulse duration.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Aseel A. Shakaty, Jassim K. Hmood, Bushra R. Mahdi, R. Mahdi, Alabbas A. Al-Azzawi
Summary: This paper investigates the use of nanodiamond particles as a saturable absorber in Erbium-doped fiber lasers to generate stable Q-switched pulses, demonstrating the promising potential of 10% nanodiamond as a material for various photonic applications. The results showed that the fabricated nanodiamond saturable absorber could produce stable laser pulses, with the Q-switched fiber laser achieving a self-start of stable Q-switch pulses at a specific pump power. The study highlights the stable performance and potential applications of nanodiamond-based saturable absorbers in fiber laser technology.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Liying Zhang, Fang Wang
Summary: In this study, passively Q-switched erbium-doped fiber lasers based on SnO2 saturable absorber (SA) were constructed and experimentally verified. It was found that SnO2 can serve as a Q-switch for near-infrared fiber lasers, achieving stable Q-switching operations. By comparing the performance of the SnO2 film and SnO2-DF SA, it was observed that the SnO2-DF SA exhibited significantly improved Q-switched pulses at 1530 nm. These findings have important implications for the progress of nonlinear optics and pulsed fiber lasers.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Optics
Zhe Kang, Mingyi Liu, Zhixu Jia, Weiping Qin, Guanshi Qin
Summary: In this study, Cu1.8S nanocrystals were used as a saturable absorber to achieve a Q-switched fiber laser at a wavelength of 1 μm. The laser cavity was pumped by a 980 nm laser diode, and stable passive Q-switching at 1038 nm was obtained with a threshold pump power of 63 mW. By increasing the pump power, the repetition rate of the Q-switched laser increased from 25.7 kHz to 54.5 kHz, while the pulse duration decreased from 6.7 μs to 2.33 μs. The results demonstrated that Cu1.8S nanocrystals are effective for constructing pulsed lasers with a broadband operating wavelength.
LASER PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Rawan S. M. Soboh, Ahmed H. H. Al-Masoodi, Fuad N. A. Erman, Ab H. H. Al-Masoodi, B. Nizamani, H. Arof, M. Yasin, S. W. Harun
Summary: In this paper, lawsone is proposed and demonstrated as a saturable absorber for passive Q-switching in an Erbium-doped fiber laser cavity. Stable Q-switched pulse operation was achieved with narrow pulse width, indicating the potential of lawsone as a suitable SA for Q-switched pulse laser in the 1.5-micron region.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
A. W. Al-Alimi, N. A. Cholan, M. T. Alresheedi, A. F. Abas, Z. A. Talib, N. Mohd Yusoff, M. A. Mahdi
Summary: This study investigates the use of polarization-maintaining thulium-doped fiber as a saturable absorber in an erbium-ytterbium-doped fiber laser. The experimental results show that stable pulse laser output can be achieved with the proposed fiber laser architecture.
RESULTS IN PHYSICS
(2022)
Article
Instruments & Instrumentation
Mingjie Xu, Hongwei Chu, Han Pan, Shengzhi Zhao, Dechun Li
Summary: This work demonstrates a stable and compact passively Q-switched erbium-doped fiber laser (EDFL) using zeolitic imidazolate framework-67 (ZIF-67) membrane as the saturable absorber (SA) for the first time. The laser achieves a high repetition frequency, short pulse width, and high signal-to-noise ratio, while maintaining good thermal stability. The results support the potential of ZIF-67 nanomaterial for generating high-energy pulses in the near-infrared region.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Optics
Rui Zhao, Nannan Xu, Xinxin Shang, Lin Zhao, Huanian Zhang, Dengwang Li
Summary: In this study, stable Q-switched-mode-locked (QML) operations were achieved in an Er-doped fiber laser using a dispersion compensating fiber (DCF) saturable absorber. The addition of DCFs of different lengths allowed for the optimization of the cavity, resulting in QML operations with higher energy and shorter pulse width compared to the dissipative soliton mode-locked operation. These results demonstrate the excellent performance of DCF in obtaining QML operations.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Xueyao Liu, Yanfeng Yu, Nannan Xu, Xinxin Shang, Pu Huang, Daizhou Zhang, Jianwei Jiang, Xing Wang, Hua Lu, Huanian Zhang, Dengwang Li
Summary: This study reports the preparation and characterization of CGT nanosheets using the liquid-phase exfoliation method. The application of CGT nanosheets in fiber lasers allows for passive Q-switching and modelocking operations. The results show that CGT nanosheets have the potential to be used in future high-performance photonic devices.
JOURNAL OF LUMINESCENCE
(2022)
Article
Engineering, Electrical & Electronic
H. Ahmad, M. U. M. Ithnahaini, M. Z. Samion, M. F. Ismail, M. K. A. Zaini, S. A. Reduan
Summary: This research demonstrated a multiwavelength erbium-ytterbium co-doped double-clad fiber laser using two-mode and four-mode fibers as comb filters. The laser generated stable lasing lines with different spacings and high output powers. The long-term stability test showed small wavelength drifts and power fluctuations for both lasers. This work proposes a stable high-power multiwavelength fiber laser with improved output power and efficiency.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
H. Ahmad, M. K. A. Zaini, M. Z. Samion
Summary: Polymer-coated FePS3 arc-shaped fiber was used for four-wave mixing (FWM) as a nonlinear device with high conversion efficiency and large wavelength tuning range. The device's performance was enhanced by overlaying low refractive index polymer on the arc-shaped fiber, making it suitable for integration in optical network applications.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ahmed Shakir Al-Hiti, Hiba Hassan, M. Yasin, S. W. Harun
Summary: We have successfully demonstrated a reliable and simple passively Q-switched Thulium-doped fiber laser (TDFL) utilizing tungsten oxide (WO3) as a saturable absorber (SA). The Q-switched TDFL pulses operate at a central wavelength 1960.2 nm with narrow bandwidth, short pulse duration, high repetition rate, output power, and pulse energy.
OPTICAL FIBER TECHNOLOGY
(2023)
Correction
Engineering, Electrical & Electronic
Alabbas A. Al-Azzawi, Aya A. Almukhtar, P. H. Reddy, S. Das, A. Dhar, M. C. Paul, H. Arof, H. Ahmad, S. W. Harun
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
H. Ahmad, B. Nizamani, M. Z. Samion, A. D. Azam, N. Yusoff
Summary: Metal phosphates are cost-effective inorganic materials with potential applications in energy storage and optoelectronic devices. This study demonstrates the synthesis of zinc phosphate and its use as a saturable absorber for a wavelength-tunable mode-locked laser at 1.9 μm. The mode-locked laser achieved soliton pulses with center wavelength tunability from 1893 to 1898.4 nm and pulse durations ranging from 1.12 to 1.4 ps.
Article
Physics, Multidisciplinary
Harith Ahmad, Kirubhashni Loganathan, Norazriena Yusoff
Summary: This study used a Graphene/Zinc Oxide (G/ZnO) nanocomposite to generate mode-locked pulses in Thulium/Holmium-doped fiber (THDF). The sol-gel method was used to synthesize ZnO particles decorated with graphene sheets. The G/ZnO nanocomposite solution was deposited onto an arc-shaped fiber acting as the saturable absorber (SA) device. By incorporating the fabricated SA into the THDF laser cavity, stable mode-locked pulses were produced at a threshold pump power of 274.3 mW with a center wavelength of 1895.11 nm, fundamental frequency of 11.82 MHz, and a pulse duration of 1.7 ps.
Article
Optics
Muhammad Syamil Mohd Sa'ad, Harith Ahmad, Mohamad Ashraff Alias, Muhammad Khairol Annuar Zaini, Muhamad Zharif Samion, Kenneth T. V. Grattan, B. M. Azizur Rahman, Gilberto Brambilla, Lim Kok Sing, Sulaiman Wadi Harun, Leonard Bayang, Siti Aisyah Reduan, Kavintheran Thambiratnam, Mohd Zamani Zulkifli, Mohammad Faizal Ismail
Summary: This paper presents the design and fabrication of an optical-based pressure sensor that utilizes a fiber Bragg grating (FBG) as the pressure sensing mechanism. The sensor can convert the pressure applied to its surface into a wavelength shift. Laboratory testing shows a high sensitivity, and field testing confirms its effectiveness in soil monitoring applications.
OPTICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Harith Ahmad, Kirubhashni Loganathan, Norazriena Yusoff, Muhamad Zharif Samion, Mohd Zamani Bin Zulkifli
Summary: This study investigated the potential of CuFe2O4@rFGO nanocomposite as a saturable absorber material in a mode-locked thulium/holmium doped fiber laser. The nanocomposite was synthesized using a hydrothermal method, and two different concentrations were prepared. By interacting with the evanescent field of light, the CuFe2O4@rFGO nanocomposite enabled the generation of stable mode-locked pulses in the laser system. This finding opens up new possibilities for CuFe2O4@rFGO research in photonics applications.
Article
Optics
Nima Naderi, Harith Ahmad
Summary: The study evaluates the role of the graphene capping layer on the optoelectronic performance of ZnO/Si solar cells at different temperatures. The results show that the graphene capping layer can improve the optical behavior of ZnO nanostructures and enhance the photovoltaic stability of ZnO-based solar cells.
OPTICS COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Seong Hong Chang, Sin Jin Tan, Abdulkadir Mukhtar Diblawe, Zian Cheak Tiu, Xiau San Cheng, Fauzan Ahmad, Sulaiman Wadi Harun
Summary: Dark pulse mode-locked Erbium doped fiber laser was achieved by coating side polished fiber with Ti3AlC2 solution. The fabricated coated structure improved the birefringence and nonlinearity, generating stable dark pulses.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Optics
Huda A. Zain, Malathy Batumalay, Hazli R. A. Rahim, Sulaiman Wadi Harun
Summary: This paper analyzes the sensitivity of the Kretschmann surface plasmon resonance (SPR) sensor and proposes a configuration that includes graphene layers to enhance sensitivity and act as a bio-compatibility agent, which can be used for biochemical sensors.
OPTOELECTRONICS LETTERS
(2023)
Article
Optics
Cheong-Weng Ooi, Kok-Sing Lim, Kuan-Huei Ng, Wu-Yi Chong, Soon-Xin Gan, Boon-Tong Goh, Harith Ahmad
Summary: This article presents the spectral properties of a Ge2Sb2Se4Te1 (GSST)-coated tilted fiber Bragg grating in response to changes in the surrounding refractive index (SRI). The variations of cladding mode resonance amplitudes and wavelengths under two orthogonal polarization modes are analyzed and validated with simulation results. The introduction of a high index coating induces non-degeneracy in the cladding modes, which gradually diminishes as SRI increases. The SRI sensitivities of s-polarized modes are substantially reduced and become 20 times lower than p-polarized modes. The findings also establish the relationship between cladding resonance amplitudes, the imaginary part of effective refractive indices, and evanescent field intensity distributions.
Article
Engineering, Electrical & Electronic
Muhammad Syamil Mohd Sa'ad, Harith Ahmad, Muhamad Zharif Samion, Mohamad Ashraff Alias, Muhammad Khairol Annuar Zaini, Lim Kok Sing, Kenneth T. V. Grattan, B. M. Azizur Rahman, Gilberto Brambilla, Sulaiman Wadi Harun, Mohammad Faizal Ismail
Summary: A fiber Bragg grating-based inclinometer probe with enhanced sensitivity has been developed for slope or ground movement monitoring. The probe is fabricated using a 3D printer and has a similar size to the conventional probe, with better resolution and sensitivity.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Mustafa Mohammed Najm, B. Nizamani, Alabbas A. Al-Azzawi, Jassim K. Hmood, Mohammed Najm Abdullah, S. W. Harun
Summary: In this study, dual-wavelength laser pulses were successfully generated from a Q-switched erbium-doped fiber laser using Mo2Ti2AlC3-SA film. The fabricated film exhibited favorable optical and physical properties, and stable pulses were achieved.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Sameer Salam, Bilal Nizamani, Huda Adnan Zain, Afiq Arif Aminuddin Jafry, Ahmad Haziq Aiman Rosol, Abdulkadir Mukhtar Diblawe, Moh Yasin, Sulaiman Wadi Harun
Summary: In this study, we developed an ultrafast fiber laser using Mo2Ti2AlC3 as a saturable absorber (SA), which successfully generated a soliton pulse train with a high signal-background noise ratio. This paper demonstrates the novel application of Mo2Ti2AlC3 as a promising SA for the first time.
OPTICAL FIBER TECHNOLOGY
(2023)
