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mode-Locked Erbium-Doped Fiber Laser Using Vanadium Oxide as saturable Absorber

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Chinese Physics Letters 2018年第4期35卷 46-48页

作者： A.Nady m.F.Baharom A.A.latiff s.W.Harun Physics Department Faculty of Science Beni Suef University Photonics Engineering Laboratory Department of Electrical Engineering University of Malaya Center for Telecommunication Research & Innovation Universiti Teknikal Malaysia Melaka

A mode-locked erbium doped fiber laser（EDFL） is demonstrated using the vanadium oxide（V2O5） material as a saturable absorber（sA）. The V2O5 based sA is hosted into poly ethylene oxide film and attached on fiber ferule in the laser cavity. It shows 7% modulation depth with 71 mW/cm2 saturation intensity. By incorporating the sA inside the EDFL cavity with managed intra-cavity dispersion, ultrashort soliton pulses are successfully generated with a full width at half maximum of 3.14 ps. The laser operated at central wavelength of 1559.25 nm and repetition frequency of 1 mHz.

关键词： EDF sA mode-Locked Erbium-Doped Fiber Laser Using Vanadium Oxide as saturable Absorber

Q-switched Erbium-Doped Fiber Laser Using Cadmium selenide Coated onto side-Polished D-shape Fiber as saturable Absorber

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Chinese Physics Letters 2018年第10期35卷 27-30页

作者： m.F.m.Rusdi m.B.H.mahyuddin A.A.latiff H.Ahmad s.W.Harun Photonics Engineering Laboratory Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka Photonic Research Center University of Malaya Department of Physics Faculty of Science and Technology Airlangga University

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.

关键词： sA Q-switched Erbium-Doped Fiber Laser Using Cadmium selenide Coated onto side-Polished D-shape Fiber as saturable Absorber

Zinc Oxide-Based Q-switched Erbium-Doped Fiber Laser

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Chinese Physics Letters 2017年第4期34卷 43-45页

作者： N.A.Aziz A.A.latiff m.Q.Lokman E.Hanafi s.W.Harun Department of Electrical Engineering Faculty of Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Centre University of Malaya Kuala Lumpur 50603 Malaysia

We demonstrate a Q-switched erbium-doped fiber laser （EDFL） using a newly developed zinc oxide- （ZnO） based saturable absorber （sA）. The sA is fabricated by embedding a prepared ZnO powder into a poly（vinyl alcohol） film. A small piece of the film is then sandwiched between two fiber ferrules and is incorporated in an EDFL cavity for generating a stable Q-switching pulse train. The EDFL operates at 1560.4nm with a pump power threshold of 11.8mW, a pulse repetition rate tunable from 22.79 to 61.43kHz, and the smallest pulse width of 7.00 μs. The Q-switching pulse shows no spectral modulation with a peak-to-pedestal ratio of 62 dB indicating the high stability of the laser. These results show that the ZnO powder has a great potential to be used for pulsed laser applications.

关键词： Zinc Oxide-Based Q-switched Erbium-Doped Fiber Laser sA ZnO

Dual-Wavelength Holmium-Doped Fiber Laser Pumped by Thulium-Ytterbium Co-Doped Fiber Laser

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Chinese Physics Letters 2016年第5期33卷 39-42页

作者： A.A.latiff A.Dhar s.W.Harun I.m.Babar s.Das m.C.Paul H.Ahmad Photonics Research Center University of Malaya Faculty of Electronics & Computer Engineering Universiti Teknikal Malaysia Melaka CsIR-Central Glass and Ceramic Research Institute Department of Electrical Engineering University of Malaya

We present an all-fiber dual-wavelength holmium-doped veloped holmium-doped fiber （HDF） as a gain medium fiber laser operating in 2 #m region using a newly de- The proposed fiber laser is constructed by using a hybrid gain medium, i.e., a thulium ytterbium co-doped fiber （TYDF） and an HDF in conjunction with a simple half-opened linear cavity, which is formed by a broadband mirror and an output coupler reflector. Without the HDF, the TYDF laser operates at wavelengths of 1991 and 1999nm with a signal-to-noise ratio of more than 34dB and the slope efficiency of 26.16 %. With the HDF, dual-wavelength output lines are obtained at 2075 and 2083nm with signal-to-noise ratios of more than difference between the two peaks of less than 1 dB at 17dB, 3dB bandwidth of less than 0.2nm and the power the TYDF laser pump power of 320roW.

关键词： by in is as nm of Dual-Wavelength Holmium-Doped Fiber Laser Pumped by Thulium-Ytterbium Co-Doped Fiber Laser HDF

Q-switched Ytterbium-Doped Fiber Laser Using Black Phosphorus as saturable Absorber

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Chinese Physics Letters 2016年第5期33卷 54-57页

作者： A.H.H.Al-masoodi m.H.m.Ahmed A.A.latiff H.Arof s.W.Harun Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya Photonics Research Center University of Malaya

We demonstrate a Q-switched ytterbium-doped fiber laser （YDFL） using a newly developed multi-layer black phosphorous （BP） saturable absorber （sA）. The BP sA is prepared by mechanically exfoliating a BP crystal and sticking the acquired BP flakes onto a scotch tape. A small piece of the tape is then placed between two ferrules and incorporated in a YDFL cavity to achieve a stable Q-switched operation in a 1.0 μm region. The laser has a pump threshold of 55.1 mW, a pulse repetition rate that is tunable from 8.2 to 32.9 kHz, and the narrowest pulse width of 10.8 μs. The highest pulse energy of 328 nJ is achieved at the pump power of 97.6 mW. Our results show that multi-layer BP is a promising sA for Q-switching laser operation.

关键词： of sA Q-switched Ytterbium-Doped Fiber Laser Using Black Phosphorus as saturable Absorber in is for BP that Figure kHz mode

Q-switched Raman Fiber Laser with molybdenum Disulfide-Based Passive saturable Absorber

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Chinese Physics Letters 2016年第7期33卷 98-101页

作者： N.Hisamuddin U.N.Zakaria m.Z.Zulkifli A.A.latiff H.Ahmad s.W.Harun Photonics Research Center University of Malaya Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya Aston Institute of Photonics Technologies Aston University

We demonstrate a Q-switched Raman fiber laser using molybdenum disulfide （mos2） as a saturable absorber （sA）. The sA is assembled by depositing a mechanically exfoliated mos2 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 8kin to generate a Q-switching pulse train operating at 1560.2nm. A 7.7-kin-long dispersion compensating fiber with 584 ***-i km-1 of dispersion is used as a nonlinear gain medium. As the pump power is increased from 395 m W to 422 m W, the repetition rate of the Q-switching pulses can be increased from 132.7 to 137.4 kHz while the pulse width is concurrently decreased from 3.35μs to 3.03μs. The maximum pulse energy of 54.3 nJ is obtained at the maximum pump power of 422 roW. These results show that the mechanically exfoliated mos2 sA has a great potential to be used for pulse generation in Raman fiber laser systems.

关键词： of with sA Q-switched Raman Fiber Laser with molybdenum Disulfide-Based Passive saturable Absorber is in for been that

molybdenum Disulphide Tape saturable Absorber for mode-Locked Double-Clad Ytterbium-Doped All-Fiber Laser Generation

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Chinese Physics Letters 2016年第11期33卷 43-46页

作者： m.F.m.Rusdi A.A.latiff E.Hanafi m.B.H.mahyuddin H.shamsudin K.Dimyati s.W.Harun Department of Electrical Engineering Faculty of EngineeringUniversity of Malaya Photonics Research Center University of Malaya

We demonstrate the generation of passive mode-locked double-clad ytterbium-doped fiber laser operating in a 1-micron region. We prepare the saturable absorber from commercial crystal of molybdenum disulphide （mos2 ）. Without chemical procedure, the mos2 is mechanically exfoliated by using a clear scotch tape. A few layers of mos2 flakes are obtained on the tape. Then, a piece of 1× 1 mm tape containing mos2 thin flakes is inserted between two fiber ferrules and is integrated in the ring cavity. stable mode-locking operation is attained at 1090nm with a repetition rate of l3.2 mHz. Our mode-locked laser has a maximum output power of 2OmW with 1.48nJ pulse energy. These results validate that the mos2 has a broad operating wavelength which covers the 1-micron region, and it is also able to work in a high-power cavity.

关键词： mode of in is for

Holmium Oxide Film as a saturable Absorber for 2μm Q-switched Fiber Laser

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Chinese Physics Letters 2017年第5期34卷 48-51页

作者： m.F.A.Rahman m.F.m.Rusdi m.Q.Lokman m.B.H.mahyuddin A.A.latiff A.H.A.Rosol K.Dimyati s.W.Harun Department of Electrical Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Centre University of Malaya Kuala Lumpur 50603 Malaysia Faculty of Electrical Engineering University Teknologi Mara Shah Alam 40450 Malaysia

This work reports on the use of the holmium oxide （Ho2O3） polymer film as a saturable absorber （sA） for generating stable Q-switching pulses operating in a 2μm region in a thulium-doped fiber laser cavity. The sA is prepared by diluting a commercial Ho3O2 powder and then mixing it with polyvinyI alcohol （PVA） solution to form a Ho2O3-PVA film. A tiny part of the film about 1mm×1 mm in size is sandwiched between two fiber ferrules with the help of index matching gel. When incorporated in a laser cavity driven by a 1552-nm pump, stable Q-switching pulses are observed at 1955nm within the pump power range of 363 491 roW. As the pmnp power increases within this range, the repetition rate rises from 26 kHz to 39 kHz, as the pulse width drops from 4.22μs to 2.57μs. The laser operates with a signal-to-noise ratio of 47dB, and the maximum output power and the pulse energy obtained are 2.67mW and 69ng, respectively. Our results successfully demonstrate that the Ho2O3 film can be used as a passive sA to generate a 2μm pulse laser.

关键词： m Q-switched Fiber Laser sA FEsEm

Erbium-Doped Zirconia-Alumina silica Glass-Based Fiber as a saturable Absorber for High Repetition Rate Q-switched All-Fiber Laser Generation

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Chinese Physics Letters 2017年第8期34卷 63-66页

作者： P. Harshavardhan Reddy N. A. A. Kadir m. C. Paul s, Das A. Dhar E. I. Ismail A. A. latiff s. W. Harun Fiber Optics and Photonics Division CSIR-Central Glass and Ceramic Research Institute Kolkata 700032 India Academy of scientific and Innovative Research CSIR-CGCRI Campus Kolkata 700032 India Department of Electrical Engineering Faculty of Engineering University of Malaya Kuala Lumpur 50603 Malaysia Photonics Research Centre University of Malaya Kuala Lumpur 50603 Malaysia Faculty of Electronic and Computer Engineering (FKEKK) Universiti Teknikal Malaysia Melaka Melaka 76100 Malaysia

We propose and demonstrate a Q-switched erbium-doped fiber laser （EDFL） using an erbium-doped zirconia-alumina silica glass-based fiber （Zr-EDF） as a saturable absorber. As a 16-cm-long Zr-EDF is incorporated into a ring EDFL cavity, a stable Q-switching pulse train operating at 1565？nm wavelength is successfully obtained. The repetition rate is tunable from 33.97？kHz to 71.23？kHz by increasing the pump power from the threshold of 26？mW to the maximum of 74？mW. The highest pulse energy of 26.67？nJ is obtained at the maximum pump power.

关键词： EDF Zr Erbium-Doped Zirconia-Alumina silica Glass-Based Fiber as a saturable Absorber for High Repetition Rate Q-switched All-Fiber Laser Generation kHz As