Molybdenum disulfide saturable absorber for eye-safe mode-locked fiber laser generation

2018 ◽  
Vol 27 (01) ◽  
pp. 1850010 ◽  
Author(s):  
A. A. Latiff ◽  
X. S. Cheng ◽  
M. F. M. Rusdi ◽  
M. C. Paul ◽  
S. W. Harun ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Molybdenum Disulfide ◽  
Saturable Absorber ◽  
Signal To Noise Ratio ◽  
Maximum Output Power ◽  
Gain Medium ◽  
Laser Generation ◽  
Maximum Output ◽  
Saturation Intensity ◽  
Co Doped

We demonstrated an all-fiber mode-locked Thulium–Holmium co-doped fiber laser (THDFL) based on molybdenum disulfide (MoS2) tape saturable absorber. The THDFL generates a mode-locked pulse in anomalous regime at 1,979[Formula: see text]nm using 5[Formula: see text]m long Thulium–Holmium co-doped (THDF) as a gain medium. Through mechanical exfoliation method, the MoS2 was mechanically extracted from a commercial MoS2 crystal by using a clear scotch tape. Through balanced twin-detector measurement, the obtained MoS2 tape has a nonlinear absorption of 10% with 100[Formula: see text]MW/cm2 saturation intensity. Under 775[Formula: see text]mW to 852[Formula: see text]mW pump power, a stable pulse train was obtained at 9.12[Formula: see text]MHz repetition rate with a signal-to-noise ratio (SNR) of 45[Formula: see text]dB. The maximum output power and pulse energy were measured about 20[Formula: see text]mW and 2.2[Formula: see text]nJ, respectively. With a 3-dB spectral bandwidth of 2.1[Formula: see text]nm, the minimum possible pulse width was determined as 1.97[Formula: see text]ps.

scholarly journals 1.3 µm dissipative soliton resonance generation in Bismuth doped fiber laser

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
H. Ahmad ◽  
S. N. Aidit ◽  
S. I. Ooi ◽  
M. Z. Samion ◽  
S. Wang ◽  
...  
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Pulse Energy ◽  
Signal To Noise Ratio ◽  
Maximum Output Power ◽  
High Energy ◽  
Gain Medium ◽  
Dissipative Soliton ◽  
Maximum Output ◽  
Soliton Resonance

AbstractIn this work, a Figure-9 (F9) bismuth-doped fiber laser (BiDFL) operating in the dissipative soliton resonance (DSR) regime is presented. The 1338 nm laser used a BiDF as the active gain medium, while a nonlinear amplifying loop mirror (NALM) in an F9 configuration was employed to obtain high energy mode-locked pulses. The wave breaking-free rectangular pulse widened significantly in the time domain with the increase of the pump power while maintaining an almost constant peak power of 0.6 W. At the maximum pump power, the mode-locked laser delivered a rectangular-shaped pulse with a duration of 48 ns, repetition rate of 362 kHz and a radio-frequency signal-to-noise ratio of more than 60 dB. The maximum output power was recorded at around 11 mW with a corresponding pulse energy of 30 nJ. This is, to the best of the author’s knowledge, the highest mode-locked pulse energy obtained at 1.3 μm as well as the demonstration of an NALM BiDFL in a F9 configuration.

scholarly journals Investigation on extreme frequency shift in silica fiber-based high-power Raman fiber laser

2018 ◽  
Vol 6 ◽  
Author(s):  
Jiaxin Song ◽  
Hanshuo Wu ◽  
Jun Ye ◽  
Hanwei Zhang ◽  
Jiangming Xu ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Fiber Laser ◽  
High Power ◽  
High Efficiency ◽  
Maximum Output Power ◽  
Gain Medium ◽  
Maximum Output ◽  
Optical Efficiency ◽  
Central Wavelength ◽  
Raman Fiber Laser

In this paper, we experimentally investigated the extreme frequency shift in high-power Raman fiber laser (RFL). The RFL was developed by using a pair of fiber Bragg gratings with fixed and matched central wavelength (1120 nm) combined with a piece of 31-m-long polarization maintaining (PM) passive fiber adopted as Raman gain medium. The pump source was a homemade high-power, linearly polarized (LP) wavelength-tunable master oscillator power amplifier (MOPA) source with ${\sim}25~\text{nm}$ tunable working range (1055–1080 nm). High-power and high-efficiency RFL with extreme frequency shift between the pump and Stokes light was explored. It is found that frequency shift located within 10.6 THz and 15.2 THz can ensure efficient Raman lasing, where the conversion efficiency is more than 95% of the maximal value, 71.3%. In addition, a maximum output power of 147.1 W was obtained with an optical efficiency of 71.3%, which is the highest power ever reported in LP RFLs to the best of our knowledge.

scholarly journals Two-micron all-fiberized passively mode-locked fiber lasers with high-energy nanosecond pulse

2020 ◽  
Vol 8 ◽  
Author(s):  
Meng Wang ◽  
Yijian Huang ◽  
Zongpeng Song ◽  
Jincheng Wei ◽  
Jihong Pei ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Pulse Duration ◽  
Output Power ◽  
Saturable Absorber ◽  
Pulse Energy ◽  
Fiber Lasers ◽  
Maximum Output Power ◽  
High Energy ◽  
Maximum Output ◽  
Stable Mode

We report on mode-locked thulium-doped fiber lasers with high-energy nanosecond pulses, relying on the transmission in a semiconductor saturable absorber (SESA) and a carbon nanotube (CNTs-PVA) film separately. A section of an SMF–MMF–SMF structure multimode interferometer with a transmission peak wavelength of ∼2003 nm was used as a wavelength selector to fix the laser wavelength. When the SESA acted as a saturable absorber (SA), the mode-locked fiber laser had a maximum output power of ∼461 mW with a pulse energy of ∼0.14 μJ and a pulse duration of ∼9.14 ns. In a CNT-film-based mode-locked fiber laser, stable mode-locked pulses with the maximum output power of ∼46 mW, pulse energy of ∼26.8 nJ and pulse duration of ∼9.3 ns were obtained. To the best of our knowledge, our experiments demonstrated the first 2 μm region ‘real’ SA-based dissipative soliton resonance with the highest mode-locked pulse energy from a ‘real’ SA-based all-fiberized resonator.

scholarly journals Observation of dark and bright pulses in q-switched erbium doped fiber laser using graphene nano-platelets as saturable absorber

2019 ◽  
Vol 8 (4) ◽  
Author(s):  
Nur Hidayah Muhamad Apandi ◽  
Siti Nur Fatin Zuikafly ◽  
Nabilah Kasim ◽  
Mohd Ambri Mohamed ◽  
Sulaiman Wadi Harun ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Signal To Noise Ratio ◽  
Ring Cavity ◽  
Laser Cavity ◽  
Laser Generation ◽  
Output Peak Power ◽  
Erbium Doped ◽  
Cavity Configuration

In this paper, a passively Q-switched Erbium doped fiber laser (EDFL) by residing Graphene nanoplatelets (GnPs) embedded in polyvinyl alcohol (PVA) based saturable absorber (SA) is demonstrated. To aid the dispersion of GNPs, a surfactant is used and then it is mixed with polyvinyl alcohol (PVA) as host polymer to develop GnPs-PVA film based passive SA. The GnPs-PVA based film then integrated in laser cavity in ring cavity configuration for pulse laser generation. The experimental works show that the proposed passive SA operates at input pump power range from 77 mW to 128 mW with a tunable repetition rate from 78.4 kHz to 114.8 kHz and a shortest pulse width of 3.69 µs. The laser produces maximum instantaneous output peak power and pulse energy of 7.3 mW and 30.46 nJ, respectively and accompanied by signal to noise ratio (SNR) of 64 dB.

scholarly journals Graphite Saturable Absorber for Q-Switched Fiber Laser

2018 ◽  
Vol 7 (4.30) ◽  
pp. 334
Author(s):  
Yushazlina R. Yuzaile ◽  
Noor A. Awang ◽  
Zahariah Zakaria ◽  
Noor U.H.H Zalkepali ◽  
Amirah A. Latif ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Modulation Depth ◽  
Signal To Noise Ratio ◽  
Optical Signal ◽  
Signal To Noise ◽  
Saturation Intensity ◽  
Maximum Pulse Energy ◽  
Optical Fiber Applications

This paper reported a successful demonstration on Q-switched fiber laser by using graphite as saturable absorber (SA). The graphite is deposited on the fiber ferrule through a simple mechanical exfoliation method. The modulation depth of the graphite SA is 19.2% with a saturation intensity of 85 MW/cm². The maximum achievable pulse repetition rates and pulse width are 42.41 kHz and 3.40 μs respectively. Meanwhile, its optical signal-to-noise ratio is about 50.81 dB. The Q-switched pulses have the maximum pulse energy of 5.84 nJ. These outcomes demonstrated that a stable output of passively Q-switched fiber laser is produced and can be applied for various optical fiber applications.

scholarly journals Q-switched Erbium Doped Fiber Laser Incorporating Antimony (III) Telluride in Polyvinyl Alcohol as Saturable Absorber

2018 ◽  
Vol 10 (2) ◽  
pp. 409
Author(s):  
Ezzatul Irradah Ismail ◽  
S Muhammad Ashraf Zolkopli ◽  
Muhammad Quisar Lokman ◽  
Hafizal Yahaya ◽  
Sulaiman Wadi Harun ◽  
...  
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Signal To Noise Ratio ◽  
Laser Generation ◽  
High Signal ◽  
Signal To Noise ◽  
Center Wavelength ◽  
Erbium Doped

<span lang="EN-US">In this paper, we demonstrated a Q-switched erbium doped fiber laser (EDFL) incorporating Antimony (III) Telluride (Sb<sub>2</sub>Te<sub>3</sub>) in polyvinyl alchohol (PVA) as passive saturable absorber.  The saturable absorber were fabricated by dissolving Antimony (III) Telluride powder into PVA solution and dry in the ambient temperature for 48 hours. Then, 1 mm<sup>2</sup> x 1 mm<sup>2</sup> Sb<sub>2</sub>Te<sub>3</sub>-PVA film based saturable absorber were sandwiched in between FC/PC ferrule for Q-switched laser generation. The stable and self-started Q-switched laser operates at center wavelength 1560 nm with 3 dB bandwidth of 0.23 nm. The laser operates at pump power of 29.3 mW until 84.9 mW with repetition rate of 20.99 kHz to 89.29 kHz and pulse width of 13.95 µs to 5.10 µs. At maximum pump power, the laser able to achieve pulse energy of 62.72 nJ and high signal to noise ratio of 71.4</span>

scholarly journals Investigation of output power in ring CW fiber laser using graphene saturable absorber

2019 ◽  
Vol 8 (3) ◽  
pp. 1022-1027
Author(s):  
Belal Ahmed Hamida ◽  
Tawfig Eltaif ◽  
Farhan Daniel Bin Mohd Noh ◽  
Sheroz Khan
Keyword(s):  
Fiber Laser ◽  
Output Power ◽  
Saturable Absorber ◽  
Continuous Wave ◽  
Ring Cavity ◽  
Maximum Output Power ◽  
Specific Area ◽  
Maximum Output ◽  
Coupling Ratio ◽  
Graphene Saturable Absorber

This paper reported the effect of different coupling ratio in continuous wave fiber laser in a ring cavity configuration. Different coupling ratios of 10/90 and 50/50 were tested. Where the output power may vary depending on the ratio and it can be applied to specific area that requires either high or low output power. In addition, generation of passive Q-switched erbium doped fiber laser (EDFL) using graphene based saturable absorber in ring cavity using different coupling ratio was experimentally investigated. As a result, wavelength centered at 1566.62nm is obtain from EDFL cavity. Moreover, the cavity using coupler of 50/50 is capable to achieve Q-switched pulses as compared to the cavity using coupler of 10/90. Where the maximum output power recorded is 336mW with pulse repetition rate of 23.74 kHz. In addition, the pulse width is 3.84µs, and pulse energy is 14.15nJ.

scholarly journals Q-switched Ytterbium-doped fibre laser using an 8 cm long Hafnium bismuth erbium co-doped fibre saturable absorber

2021 ◽  
Vol 2075 (1) ◽  
pp. 012020
Author(s):  
M F A Rahman ◽  
P H Reddy ◽  
A Ahmad ◽  
A A Latiff ◽  
M F Baharom ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Peak Power ◽  
Maximum Output Power ◽  
Fibre Laser ◽  
Maximum Output ◽  
Practical Applications ◽  
Maximum Pulse Energy ◽  
Co Doped

Abstract In this paper, we present a Q-switched fibre laser at 1069 nm which is induced by an 8 cm long Hafnium bismuth erbium co-doped fibre (HBEDF) saturable absorber (SA). The pulsating laser has a maximum repetition rate of 67 kHz at 175 mW pump power. We obtained the narrowest pulse width of 3.48 μs, the maximum pulse energy of 70.2 nJ, the maximum output power of 4.7 mW and the maximum peak power of 20.1 mW. The Q-switched laser is simple and may found practical applications in medicine and remote sensing.

Dual-Wavelength Thulium Ytterbium Co-Doped Fiber Laser

2017 ◽  
Vol 8 (2) ◽  
pp. 457
Author(s):  
Hazlihan Haris ◽  
Ahmad Razif Muhammad ◽  
Norazlina Saidin ◽  
Mohd Shahnan Zainal Abidin ◽  
Hamzah Arof ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Signal To Noise Ratio ◽  
Ring Cavity ◽  
Gain Medium ◽  
Optical Signal ◽  
Dual Wavelength ◽  
Mode Competition ◽  
Multimode Laser ◽  
Dual Wavelength Laser ◽  
Co Doped

<p>We report on the generation of dual-wavelength fiber laser peaking at 1990.64 and 1998.92 nm with a simple ring cavity setup. The lasers are demonstrated using a fabricated silica-based nano-engineered octagonal shaped double-clad Thulium-Ytterbium co-doped fiber (TYDF) as a gain medium in a simple all-fiber ring configuration. By using 980 nm multimode laser, a stable dual-wavelength laser is generated at a threshold pump power of 1500 mW due to the non-polarization rotation (NPR) effect occurred in the cavity. The effect has been self-controlled by a suppression of mode competition in the gain medium. The result shows that the slope efficiency of the generated dual–wavelength laser is measured to be 27.23%. This dual-wavelength TYDF laser operated steadily at room temperature with a 34 dB optical signal-to-noise ratio.</p><p> </p><strong><em>Keywords</em></strong><em>: Dual-wavelength fiber laser, nano-engineered glass, silica-based TYDF, NPR effect.</em>

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