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.

scholarly journals 1.34 µm Q-Switched Nd:YVO4 Laser with a Reflective WS2 Saturable Absorber

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1200 ◽  
Author(s):  
Taijin Wang ◽  
Yonggang Wang ◽  
Jiang Wang ◽  
Jing Bai ◽  
Guangying Li ◽  
...  
Keyword(s):  
Solid State ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Maximum Output Power ◽  
Laser Pulses ◽  
Solid State Laser ◽  
Maximum Output ◽  
Langmuir Blodgett ◽  
Short Laser Pulses ◽  
First Time

In this work, a Tungsten disulfide (WS2) reflective saturable absorber (SA) fabricated using the Langmuir–Blodgett technique was used in a solid state Nd:YVO4 laser operating at 1.34 µm. A Q-switched laser was constructed. The shortest pulse width was 409 ns with the repetition rate of 159 kHz, and the maximum output power was 338 mW. To the best of our knowledge, it is the first time that short laser pulses have been generated in a solid state laser at 1.34 µm using a reflective WS2 SA fabricated by the Langmuir–Blodgett method.

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 β-Ga2O3 Used as a Saturable Sbsorber to Realize Passively Q-Switched Laser Output

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1501
Author(s):  
Baizhong Li ◽  
Qiudi Chen ◽  
Peixiong Zhang ◽  
Ruifeng Tian ◽  
Lu Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Peak Power ◽  
Maximum Output Power ◽  
Output Coupling ◽  
Maximum Output ◽  
Floating Zone ◽  
Center Wavelength ◽  
Maximum Pulse Energy ◽  
First Time ◽  
State 1

β-Ga2O3 crystals have attracted great attention in the fields of photonics and photoelectronics because of their ultrawide band gap and high thermal conductivity. Here, a pure β-Ga2O3 crystal was successfully grown by the optical floating zone (OFZ) method, and was used as a saturable absorber to realize a passively Q-switched all-solid-state 1 μm laser for the first time. By placing the as-grown β-Ga2O3 crystal into the resonator of the Nd:GYAP solid-state laser, Q-switched pulses at the center wavelength of 1080.4 nm are generated under a output coupling of 10%. The maximum output power is 191.5 mW, while the shortest pulse width is 606.54 ns, and the maximum repetition frequency is 344.06 kHz. The maximum pulse energy and peak power are 0.567 μJ and 0.93 W, respectively. Our experimental results show that the β-Ga2O3 crystal has great potential in the development of an all-solid-state 1 μm pulsed laser.

Passively Q-switched Nd:YVO4 laser with few-layered MoSe2 saturable absorber

2020 ◽  
pp. 2150043
Author(s):  
Shang Gao ◽  
Wei Wang
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Saturable Absorber ◽  
Pulse Width ◽  
Maximum Output Power ◽  
Solid Base ◽  
Maximum Output ◽  
Absorption Properties ◽  
Ultrasonic Assisted ◽  
Liquid Phase Exfoliation

We fabricated few-layered MoSe2 nanosheets via the simple ultrasonic-assisted liquid phase exfoliation (UALPE) method. Typical characterizations and testing were exploited to confirm the nonlinear absorption properties of MoSe2 nanoflakes. A passively Q-switched Nd:YVO4 laser emitting 1 [Formula: see text]m wavelength was demonstrated with the as-prepared MoSe2 saturable absorber (SA). The stable pulses were generated with a maximum output power of 215 mW and a shortest pulse width of 192 ns. The experimental data provided a solid base for the photonics applications of MoSe2 nanomaterials.

scholarly journals Metallic 2H-Tantalum Selenide Nanomaterials as Saturable Absorber for Dual-Wavelength Q-Switched Fiber Laser

Sensors ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 239
Author(s):  
Lingling Yang ◽  
Ruwei Zhao ◽  
Duanduan Wu ◽  
Tianxiang Xu ◽  
Xiaobiao Liu ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Saturable Absorber ◽  
Peak Power ◽  
Dual Wavelength ◽  
Transition Metal Dichalcogenide ◽  
Promising Candidate ◽  
Laser Applications ◽  
Maximum Pulse Energy ◽  
Structure Simulation ◽  
Tantalum Selenide

A novel 2H-phase transition metal dichalcogenide (TMD)–tantalum selenide (TaSe2) with metallic bandgap structure is a potential photoelectric material. A band structure simulation of TaSe2 via ab initio method indicated its metallic property. An effective multilayered TaSe2 saturable absorber (SA) was fabricated using liquid-phase exfoliation and optically driven deposition. The prepared 2H–TaSe2 SA was successfully used for a dual-wavelength Q-switched fiber laser with the minimum pulse width of 2.95 μs and the maximum peak power of 64 W. The repetition rate of the maximum pulse energy of 89.9 kHz was at the level of 188.9 nJ. The metallic 2H–TaSe2 with satisfactory saturable absorbing capability is a promising candidate for pulsed laser applications.

scholarly journals Graphene slurry based passive Q-switcher in erbium doped fiber laser

2019 ◽  
Vol 8 (4) ◽  
Author(s):  
Siti Nur Fatin Zuikafly ◽  
Nor Farhah Razak ◽  
Rizuan Mohd Rosnan ◽  
Sulaiman Wadi Harun ◽  
Fauzan Ahmad
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Pulse Width ◽  
Peak Power ◽  
Signal To Noise Ratio ◽  
Pulsed Laser ◽  
Laser Cavity ◽  
Signal To Noise ◽  
Maximum Pulse Energy ◽  
Erbium Doped

In this work, a Graphene slurry based passive Q-switcher fabricated from Graphene-Polylactic acid (PLA) filament which is used for 3D printing. To produce the Graphene slurry, the diameter of the filament was reduced and Tetrahydrofuran (THF) was used to dissolve the PLA. The Graphene-THF suspension was drop cast to the end of a fiber ferrule and the THF then evaporated to develop Graphene slurry based SA which is integrated in fiber laser cavity. At threshold input pump power of 30.45 mW, a Q-switched Erbium-doped fiber laser (EDFL) can be observed with the wavelength centered at 1531.01 nm and this remained stable up to a pump power of 179.5 mW. As the pump power was increased gradually, an increase in the repetition rates was recorded from 42 kHz to 125 kHz, while the pulse width was reduced to 2.58 μs from 6.74 μs. The Q-switched laser yielded a maximum pulse energy and peak power of 11.68 nJ and 4.16 mW, respectively. The proposed Graphene slurry based saturable absorber also produced a signal-to-noise ratio of 44 dB indicating a stable Q-switched pulsed laser.

scholarly journals Preparation and Study of Sulfonated Co-Polynaphthoyleneimide Proton-Exchange Membrane for a H2/Air Fuel Cell

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5297
Author(s):  
Ulyana M. Zavorotnaya ◽  
Igor I. Ponomarev ◽  
Yulia A. Volkova ◽  
Alexander D. Modestov ◽  
Vladimir N. Andreev ◽  
...  
Keyword(s):  
Diffusion Coefficient ◽  
Proton Exchange Membrane ◽  
Maximum Output Power ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Molar Ratio ◽  
Disulfonic Acid ◽  
Membrane Electrode ◽  
Maximum Output ◽  
Practical Applications

The sulfonated polynaphthoyleneimide polymer (co-PNIS70/30) was prepared by copolymerization of 4,4′-diaminodiphenyl ether-2,2′-disulfonic acid (ODAS) and 4,4’-methylenebisanthranilic acid (MDAC) with ODAS/MDAC molar ratio 0.7/0.3. High molecular weight co-PNIS70/30 polymers were synthesized either in phenol or in DMSO by catalytic polyheterocyclization in the presence of benzoic acid and triethylamine. The titration reveals the ion-exchange capacity of the polymer equal to 2.13 meq/g. The membrane films were prepared by casting polymer solution. Conductivities of the polymer films were determined using both in- and through-plane geometries and reached ~96 and ~60 mS/cm, respectively. The anisotropy of the conductivity is ascribed to high hydration of the surface layer compared to the bulk. SFG NMR diffusometry shows that, in the temperature range from 213 to 353 K, the 1H self-diffusion coefficient of the co-PNIS70/30 membrane is about one third of the diffusion coefficient of Nafion® at the same humidity. However, temperature dependences of proton conductivities of Nafion® and of co-PNIS70/30 membranes are nearly identical. Membrane–electrode assemblies (MEAs) based on co-PNIS70/30 were fabricated by different procedures. The optimal MEAs with co-PNIS70/30 membranes are characterized by maximum output power of ~370 mW/cm2 at 80 °C. It allows considering sulfonated co-PNIS70/30 polynaphthoyleneimides membrane attractive for practical applications.

scholarly journals β-Ga2O3 Used as a Saturable Absorber to Realize Passively Q-Switched Laser Output

2021 ◽  
Author(s):  
Baizhong Li ◽  
Qiudi Chen ◽  
Peixiong Zhang ◽  
Ruifeng Tian ◽  
Lu Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Maximum Output Power ◽  
Wide Band ◽  
Output Coupling ◽  
Maximum Output ◽  
Wide Band Gap ◽  
Saturable Absorbers ◽  
Maximum Pulse Energy ◽  
First Time ◽  
State 1

β-Ga2O3 crystal have attracted great attentions in the fields of photonics and photoelectronics because of its ultra wide-band gap and high thermal conductivity. Here, pure β-Ga2O3 crystal was successfully grown by optical floating zone (OFZ) method, and used as saturable absorbers to realize a passively Q-switched all-solid-state 1μm laser for the first time. By placing the as-grown β-Ga2O3 crystal into the resonator of Nd:GYAP solid-state laser, a Q-switched pulses at the center wavelength of 1080.4 nm are generated under a output coupling of 10%. The maximum output power is 191.5 mW while the shortest pulse width is 606.54 ns, and the maximum repetition frequency is 344.06 kHz. The maximum pulse energy and peak power are 0.567 μJ and 0.93 W, respectively. Our experimental results show that β-Ga2O3 crystal has great potential in the development of all-solid-state 1μm pulsed laser.

scholarly journals COPPER-BASED 3D PRINTER FILAMENT AS PASSIVE Q-SWITCHER

2021 ◽  
Vol 2075 (1) ◽  
pp. 012003
Author(s):  
N. N. A. A. N Zain ◽  
N. A. H. Jasni ◽  
W. M. F. W Nawawi ◽  
F. Ahmad
Keyword(s):  
Pulse Energy ◽  
Repetition Rate ◽  
Pulse Width ◽  
Peak Power ◽  
Fibre Laser ◽  
3D Printer ◽  
High Pulse Energy ◽  
Erbium Doped ◽  
High Pulse ◽  
Host Polymer

Abstract Using a copper-based saturable absorber (SA) and chitin as a biocompatible host polymer, this research effectively demonstrated the production of passive Q-switched in an erbium-doped fibre laser (EDFL). A Q-switched lasing was generated with a 100 kHz repetition rate and a pulse width of 4.60 µs. High pulse energy of 17.19 nJ was generated, with a respective instantaneous peak power of 3.51 mW.

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