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C Svelto - One of the best experts on this subject based on the ideXlab platform.
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widely tunable single frequency erbium ytterbium phosphate glass laser
Applied Physics Letters, 1996Co-Authors: S Taccheo, P Laporta, C SveltoAbstract:A tunable, single‐frequency, diode‐Pumped miniature Er:Yb:glass laser of high Power is described. The laser exhibits two intervals of continuous tuning, from 1549 to 1563 nm (Δλ=14 nm) and from 1531 to 1540 nm (Δλ=9 nm), respectively. For an Input Pump Power of 140 mW, a single frequency output Power of 20 mW at 1563 nm has been obtained. The tuning characteristics are found to be strictly related to the gain–loss balance of the laser cavity.
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Widely tunable single‐frequency erbium–ytterbium phosphate glass laser
Applied Physics Letters, 1996Co-Authors: Stefano Taccheo, P Laporta, C SveltoAbstract:A tunable, single‐frequency, diode‐Pumped miniature Er:Yb:glass laser of high Power is described. The laser exhibits two intervals of continuous tuning, from 1549 to 1563 nm (Δλ=14 nm) and from 1531 to 1540 nm (Δλ=9 nm), respectively. For an Input Pump Power of 140 mW, a single frequency output Power of 20 mW at 1563 nm has been obtained. The tuning characteristics are found to be strictly related to the gain–loss balance of the laser cavity.
S Taccheo - One of the best experts on this subject based on the ideXlab platform.
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widely tunable single frequency erbium ytterbium phosphate glass laser
Applied Physics Letters, 1996Co-Authors: S Taccheo, P Laporta, C SveltoAbstract:A tunable, single‐frequency, diode‐Pumped miniature Er:Yb:glass laser of high Power is described. The laser exhibits two intervals of continuous tuning, from 1549 to 1563 nm (Δλ=14 nm) and from 1531 to 1540 nm (Δλ=9 nm), respectively. For an Input Pump Power of 140 mW, a single frequency output Power of 20 mW at 1563 nm has been obtained. The tuning characteristics are found to be strictly related to the gain–loss balance of the laser cavity.
P Laporta - One of the best experts on this subject based on the ideXlab platform.
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widely tunable single frequency erbium ytterbium phosphate glass laser
Applied Physics Letters, 1996Co-Authors: S Taccheo, P Laporta, C SveltoAbstract:A tunable, single‐frequency, diode‐Pumped miniature Er:Yb:glass laser of high Power is described. The laser exhibits two intervals of continuous tuning, from 1549 to 1563 nm (Δλ=14 nm) and from 1531 to 1540 nm (Δλ=9 nm), respectively. For an Input Pump Power of 140 mW, a single frequency output Power of 20 mW at 1563 nm has been obtained. The tuning characteristics are found to be strictly related to the gain–loss balance of the laser cavity.
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Widely tunable single‐frequency erbium–ytterbium phosphate glass laser
Applied Physics Letters, 1996Co-Authors: Stefano Taccheo, P Laporta, C SveltoAbstract:A tunable, single‐frequency, diode‐Pumped miniature Er:Yb:glass laser of high Power is described. The laser exhibits two intervals of continuous tuning, from 1549 to 1563 nm (Δλ=14 nm) and from 1531 to 1540 nm (Δλ=9 nm), respectively. For an Input Pump Power of 140 mW, a single frequency output Power of 20 mW at 1563 nm has been obtained. The tuning characteristics are found to be strictly related to the gain–loss balance of the laser cavity.
M A Mahdi - One of the best experts on this subject based on the ideXlab platform.
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analytical study of nonlinear phase shift through stimulated brillouin scattering in single mode fiber with the Pump Power recycling technique
Journal of Optics, 2011Co-Authors: Hamid Ali Abed Alasadi, F Mahamd R Adikan, Ahmad Ashrif A Bakar, M A MahdiAbstract:We present a theoretical study of nonlinear phase shift through stimulated Brillouin scattering in single mode optical fiber. Analytical expressions describing the nonlinear phase shift for the Pump and Stokes waves in the Pump Power recycling technique have been derived. The dependence of the nonlinear phase shift on the optical fiber length, the reflectivity of the optical mirror and the frequency detuning coefficient have been analyzed for different Input Pump Power values. We found that with the recycling Pump technique, the nonlinear phase shift due to stimulated Brillouin scattering reduced to less than 0.1 rad for 5 km optical fiber length and 0.65 reflectivity of the optical mirror, respectively, at an Input Pump Power equal to 30 mW.
Sulaiman Wadi Harun - One of the best experts on this subject based on the ideXlab platform.
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Zinc oxide nanoparticles based passive saturable absorber for pulse generation in fiber laser
TELKOMNIKA Telecommunication Computing Electronics and Control, 2019Co-Authors: Nurul Alina Afifi Norizan, Fauzan Ahmad, Muhammad Quisar Lokman, Sulaiman Wadi HarunAbstract:A stable passive Q-switched pulsed generation in Erbium doped fiber laser by Zinc Oxide nanoparticles embedded in polyvinyl alcohol (ZnONP-PVA)-based saturable absorber is demonstrated in this paper. The surface morphology and thickness profile of the fabricated film were observed using FESEM and 3D measuring laser microscope with the measured thickness of 12 µm. Meanwhile the its optical properties is characterized using Raman spectroscopy. The developed ZnONP-PVA film, has modulation depth of 7.8% and intensity saturation of 88.97 MW/cm2. The threshold Input Pump Power to generate Q-switched pulse is at 45.4 mW and can be tuned until 92.4 mW before the pulse diminished. The operating wavelength of generated pulse is at 1535 nm with 3 dB bandwidth approximately of 2 nm with exclusion of parasitic continuous wave lasing. As the Input Pump Power was tuned from threshold to maximum value, the recorded pulse train of repetition rate is tunable from 73.53 kHz to 103.10 kHz while the pulse width decreases from 6.8 µs to 4.8 µs. The calculated maximum output Power and pulse energy at maximum Input Pump Power was 5.14 mW and 49.85 nJ, respectively. The measured signal to noise ratio was 56 dB indicated that the generated pulse by ZnO NP based passive saturable absorber was stable.
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Q-switched Erbium Doped Fiber Laser Incorporating Zinc Oxide in Polyvinyl Alcohol as Passive Saturable Absorber
Journal of Telecommunication Electronic and Computer Engineering, 2018Co-Authors: Nurul Alina Afifi Norizan, Fauzan Ahmad, Muhammad Quisar Lokman, Siti Nur Fatin Zuikafly, Hafizal Yahaya, Sulaiman Wadi HarunAbstract:The search for the ideal saturable absorber in realizing a better pulsed laser is still on-going. With a wider bandgap, zinc oxide promises better laser performance in terms of higher stability, better temperature durability, and higher Power operation. These properties were clearly demonstrated using a Q-switched Erbium-doped fiber laser residing a newly fabricated Zinc Oxide embedded in polyvinyl alcohol (ZnOPVA) based film as a passive saturable absorber in a ring laser cavity. The surface morphology of the fabricated ZnO-PVA film shows a thoroughly mixed composite with a measured film thickness of 22 µm. The Q-switched laser operates at 1557.6 nm within a tunable Input Pump Power from 23.8 mW to 134.8 mW. At maximum Input Pump Power, the generated pulse produce shortest pulse width, maximum repetition rate, maximum instantaneous peak Power maximum pulse energy of 4.52 s, 71.84 kHz, 6.7 mW and 31.6 nJ, respectively. The first beat note of the measured signal to ratio is around 61 dB, which indicates the stability of the generated pulse. The proposed Q-switched laser can be further improved and can find potential application in metrology, fiber sensor, medical diagnostics and the most commonly known optical communication.
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Demonstration of passive saturable absorber by utilizing MWCNT-ABS filament as starting material
IOP Conference Series: Materials Science and Engineering, 2017Co-Authors: Siti Nur Fatin Zuikafly, Mohd Haniff Ibrahim, Faridahanim Ahmad, Amirah Abdul Latif, Sulaiman Wadi HarunAbstract:This work demonstrated a stable passively Q-switched laser with the employment MWCNTs dispersed in acrylonitrile butadiene styrene (ABS) resin (MWCNTs-ABS) based filament as passive saturable absorber. The simple fabrication process of the SA is further explained, started from the process of extruding the filament through a 3D printer nozzle at 210 °C to reduce the diameter from 1.75 mm to 200 μm. It is then weighed to about 25 mg and mixed with 1 ml acetone before sonicated for 5 minutes to dissolve the ABS. The resultant MWCNTs-acetone suspension is dropped on a glass slide to be characterized using Field-Emission Scanning Electron Microscope (FESEM) and Raman spectroscopy. It is also drop-casted on the end of a fiber ferrule to be integrated in the laser cavity. The proposed work revealed that the laser oscillated at about 1558 nm with threshold Input Pump Power of 22.54 mW and maximum Input Pump Power of 108.8 mW. The increase in Pump Power resulted in the increase in repetition rate where the pulse train increases from 8.96 kHz to 39.34 kHz while the pulse width decreases from 33.58 μs to 5.14 μs. The generated pulsed laser yields a maximum of 1.01 mW and 5.53 nJ of peak Power and pulse energy respectively. The signal-to-noise ratio of 40 dB indicates that the generated pulse is stable.
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Graphene Nanoplatelets (GnP)-PVA Based Passive Saturable Absorber
TELKOMNIKA Telecommunication Computing Electronics and Control, 2017Co-Authors: Nabihah Hussin, Mohd Haniff Ibrahim, Fauzan Ahmad, Hafizal Yahaya, Sulaiman Wadi HarunAbstract:A passive Q-switched pulsed laser at 1.5 m region incorporating graphene nanoplatelets (GnPs) embedded in Polyvinyl Alcohol (PVA) is demonstrated. A surfactant is used to aid the dispersion of the GnPs before it is mixed with PVA to develop a GnPs-PVA film based SA. The SA is integrated into the laser cavity by attaching a cut of the GnPs-PVA film in between two fiber ferrule of the laser ring cavity.The proposed GnPs-PVA film based passive Q–switched laser was able to operate as the Input Pump Power was increased from 39 mW up to a maximum of 148 mW before diminishing. The laser obtained operated with a central wavelength of 1530.76 nm. Repetition rates were obtained at 33 kHz to 91.5 kHz, throughout the tunable Input Pump Power with the shortest pulse width of 2.42 s. Maximum attainable peak Power and pulse energy of 1.2 mW and 5.9 nJ, respectively, was recorded, accompanied by a signal to noise ratio (SNR) of 28 dB.
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Dual-wavelength passively Q-switched erbium-doped fiber laser with MWCNTs slurry as a saturable absorber
Photonics Letters of Poland, 2016Co-Authors: Siti Nur Fatin Zuikafly, Fauzan Ahmad, Mohd Haniff Ibrahim, Anas Abdul Latiff, Sulaiman Wadi HarunAbstract:In this work, a compact, stable dual-wavelength Q-switched laser has been demonstrated, with a multi-walled carbon nanotubes (MWCNTs) slurry as a saturable absorber (SA) which is independent of any host polymer. The MWCNTs slurry is fabricated and the peak shift is investigated using Raman spectroscopy.The passively Q-switched erbium-doped fiber laser (EDFL) oscillated simultaneously at 1532.32nm and 1556.97nm with 24.67nm peak separation, at threshold and maximum Input Power of 26mW and 74mW, respectively. By increasing the Input Pump Power from 36mW to 74mW, the pulse train repetition rate increases from 25kHz to 78kHz, while the pulse width is reduced from 17.84μs to 5.24μs. The generated pulse produced maximum pulse energy and maximum peak Power of 11.97nJ and 2.05mW, respectively at maximum Input Pump Power. The recorded signal to noise ratio is about 62dB and shows that the proposed MWCNTs slurry based SA is able to generate dual wavelength Q-switched pulse laser with a high stability pulse.