scholarly journals 164 fs mode-locked erbium-doped fiber laser based on tungsten ditelluride

Nanophotonics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 2763-2769
Author(s):  
Mengli Liu ◽  
Wenjun Liu ◽  
Ximei Liu ◽  
Yuyi Ouyang ◽  
Zhiyi Wei
Keyword(s):  
Ultrafast Lasers ◽  
Modulation Depth ◽  
Ring Cavity ◽  
Transition Metal Dichalcogenides ◽  
Ultrashort Pulses ◽  
Saturable Absorption ◽  
Absorption Properties ◽  
Broadband Absorption ◽  
Erbium Doped ◽  
Metal Dichalcogenides

AbstractIn recent years, the diversity of transition metal dichalcogenides (TMDs) has made them occupy the essential status in the exploration of saturable absorbing materials. WTe2, also an important member of TMDs not only exhibits narrower band gap than MoS2 or WS2, but also has fast relaxation time, thus it has advantages in the realization of broadband absorption and ultrashort pulses. In this work, a WTe2 saturable absorber (SA) fabricated by magnetron sputtering technology features nonlinear absorption coefficient of −3.78 × 10−5 cm/W and modulation depth of 37.95%. After integrating this WTe2 SA into the ring cavity, a 164 fs mode-locked laser is achieved at 1557.71 nm. The laser remains stable about 8 h with an output power of 36.7 mW. The results show the favorable saturable absorption properties of WTe2, and further demonstrate the potential of WTe2 in the realization of ultrashort pulses, which indicates that WTe2 can be regarded as a possible candidate for future ultrafast lasers.

scholarly journals Nonlinear Optical Properties of Zirconium Diselenide and Its Ultra-Fast Modulator Application

Nanomaterials ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1419 ◽  
Author(s):  
Wang ◽  
Zheng ◽  
Guo ◽  
Chen ◽  
Zhang ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Modulation Depth ◽  
Ring Cavity ◽  
Maximum Output Power ◽  
Mode Locking ◽  
Saturable Absorption ◽  
Maximum Output ◽  
Transition Metal Dichalcogenide ◽  
Absorption Properties ◽  
Zirconium Diselenide

Recently, two-dimensional (2D) materials have been widely studied by researchers due to their exceptional 2D structure and excellent optical characteristics. As one of the typically-layered 2D transition metal dichalcogenide (TMD) semiconductors from group IVB with a bandgap value of 0.9–1.2 eV (bulk to monolayer), the characteristics of zirconium diselenide (ZrSe2) have already been extensively investigated in many fields. However, the nonlinear absorption properties of ZrSe2 in ultra-fast lasers have not been previously demonstrated. In this work, we measured various parameters in order to investigate the characteristics of the nonlinear saturable absorption of ZrSe2. A ZrSe2–polyvinyl alcohol (PVA) film was successfully prepared, which was employed as a saturable absorber (SA) to demonstrate, for the first time, an erbium (Er)-doped passive mode-locking fiber laser with a ring cavity. The saturation intensity of the ZrSe2–PVA film-type SA is 12.72 MW/cm2, while its modulation depth is 2.3%. The stable soliton state with a maximum output power of 11.37 mW and a narrowest monopulse duration of 12.5 ps at a repetition frequency of 21.22 MHz was detected. The experimental results conclusively proved that ZrSe2, with its suitable bandgap value and excellent nonlinear absorption properties, as well as its high damage threshold, should have extensive potential applications within the field of ultra-fast pulse lasers.

scholarly journals VS2 as saturable absorber for Q-switched pulse generation

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2569-2576 ◽  
Author(s):  
Lu Li ◽  
Lihui Pang ◽  
Qiyi Zhao ◽  
Yao Wang ◽  
Wenjun Liu
Keyword(s):  
Saturable Absorber ◽  
Nonlinear Optical ◽  
Modulation Depth ◽  
Signal To Noise Ratio ◽  
Transition Metal Dichalcogenides ◽  
Laser Cavity ◽  
Pulse Generation ◽  
High Signal ◽  
Power Pulse ◽  
Metal Dichalcogenides

AbstractTransition metal dichalcogenides have been widely utilized as nonlinear optical materials for laser pulse generation applications. Herein, we study the nonlinear optical properties of a VS2-based optical device and its application as a new saturable absorber (SA) for high-power pulse generation. Few-layer VS2 nanosheets are deposited on the tapered region of a microfiber to form an SA device, which shows a modulation depth of 40.52%. After incorporating the microfiber-VS2 SA into an Er-doped fiber laser cavity, passively Q-switched pulse trains could be obtained with repetition rates varying from 95 to 233 kHz. Under the pump power of 890 mW, the largest output power and shortest pulse duration are measured to be 43 mW and 854 ns, respectively. The high signal-to-noise ratio of 60 dB confirms the excellent stability of the Q-switching state. To the best of our knolowdge, this is the first illustration of using VS2 as an SA. Our experimental results demonstrate that VS2 nanomaterials have a large potential for nonlinear optics applications.

scholarly journals Recent progress in photodetectors based on low-dimensional nanomaterials

2018 ◽  
Vol 7 (5) ◽  
pp. 393-411 ◽  
Author(s):  
Zhenhui Li ◽  
Ke Xu ◽  
Fanan Wei
Keyword(s):  
High Performance ◽  
Transition Metal Dichalcogenides ◽  
High Sensitivity ◽  
Chemical Doping ◽  
Future Directions ◽  
Broadband Absorption ◽  
Metal Dichalcogenides ◽  
Ir Detection ◽  
Low Dimensional ◽  
Bohr Exciton Radius

Abstract Photodetectors (PDs) have great potential in applications of imaging, telecommunication, and biological sensing. In this article, state-of-the-art achievements on typical low-dimensional nanostructured PDs and hybrid PDs are reviewed. In the 2D nanostructured PDs part, 2D transition metal dichalcogenides have a natural gap, which promise high sensitivity of photodetection. Graphene and black phosphorus can also stand for 2D nanostructured PDs due to their broadband absorption and tunable direct bandgap, respectively. In the 1D nanostructured PDs part, owing to its high photoconductive characteristic, ZnO nanowire film is a promising material for ultraviolet PDs. Carbon nanotubes show potential in infrared (IR) detection due to its unique physical properties. In the 0D nanostructured PDs part, lead sulfide has a small bandgap and large Bohr exciton radius, which collectively give it a wide spectral tunability in the IR. In the hybrid PDs part, electrical and chemical doping is applied to combine different nanomaterials to realize PDs with high performance. In each part, the present situation and major challenges are overviewed. Then, the evolutions of the methods to overcome these challenges and the tremendous research breakthroughs are demonstrated. At last, future directions that could improve the performance of PDs are discussed.

scholarly journals Synchronized multi-wavelength soliton fiber laser via intracavity group delay modulation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Dong Mao ◽  
Huaqiang Wang ◽  
Heze Zhang ◽  
Chao Zeng ◽  
Yueqing Du ◽  
...  
Keyword(s):  
Ultrafast Lasers ◽  
Group Delay ◽  
Temporal Structure ◽  
Chromatic Dispersion ◽  
Complex Structure ◽  
Ultrashort Pulses ◽  
Saturable Absorption ◽  
Pulse Shaper ◽  
Longitudinal Modes ◽  
Multi Wavelength

AbstractLocking of longitudinal modes in laser cavities is the common path to generate ultrashort pulses. In traditional multi-wavelength mode-locked lasers, the group velocities rely on lasing wavelengths due to the chromatic dispersion, yielding multiple trains of independently evolved pulses. Here, we show that mode-locked solitons at different wavelengths can be synchronized inside the cavity by engineering the intracavity group delay with a programmable pulse shaper. Frequency-resolved measurements fully retrieve the fine temporal structure of pulses, validating the direct generation of synchronized ultrafast lasers from two to five wavelengths with sub-pulse repetition-rate up to ~1.26 THz. Simulation results well reproduce and interpret the key experimental phenomena, and indicate that the saturable absorption effect automatically synchronize multi-wavelength solitons in despite of the small residual group delay difference. These results demonstrate an effective approach to create synchronized complex-structure solitons, and offer an effective platform to study the evolution dynamics of nonlinear wavepackets.

scholarly journals Solution-processed two-dimensional materials for ultrafast fiber lasers (invited)

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2169-2189 ◽  
Author(s):  
Bo Fu ◽  
Jingxuan Sun ◽  
Gang Wang ◽  
Ce Shang ◽  
Yuxuan Ma ◽  
...  
Keyword(s):  
Fiber Lasers ◽  
Modulation Depth ◽  
2D Materials ◽  
Low Cost ◽  
Transition Metal Dichalcogenides ◽  
Solution Processing ◽  
Two Dimensional ◽  
Solution Processed ◽  
Metal Dichalcogenides ◽  
And Performance

AbstractSince graphene was first reported as a saturable absorber to achieve ultrafast pulses in fiber lasers, many other two-dimensional (2D) materials, such as topological insulators, transition metal dichalcogenides, black phosphorus, and MXenes, have been widely investigated in fiber lasers due to their broadband operation, ultrafast recovery time, and controllable modulation depth. Recently, solution-processing methods for the fabrication of 2D materials have attracted considerable interest due to their advantages of low cost, easy fabrication, and scalability. Here, we review the various solution-processed methods for the preparation of different 2D materials. Then, the applications and performance of solution-processing-based 2D materials in fiber lasers are discussed. Finally, a perspective of the solution-processed methods and 2D material-based saturable absorbers are presented.

scholarly journals Broadband Optical Properties of Atomically Thin PtS2 and PtSe2

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3269
Author(s):  
Georgy A. Ermolaev ◽  
Kirill V. Voronin ◽  
Mikhail K. Tatmyshevskiy ◽  
Arslan B. Mazitov ◽  
Aleksandr S. Slavich ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Constants ◽  
Transition Metal Dichalcogenides ◽  
Optoelectronic Device ◽  
High Refractive Index ◽  
Broadband Absorption ◽  
Wide Range ◽  
Out Of Plane ◽  
Metal Dichalcogenides ◽  
Infrared Wavelengths

Noble transition metal dichalcogenides (TMDCs) such as PtS2 and PtSe2 show significant potential in a wide range of optoelectronic and photonic applications. Noble TMDCs, unlike standard TMDCs such as MoS2 and WS2, operate in the ultrawide spectral range from ultraviolet to mid-infrared wavelengths; however, their properties remain largely unexplored. Here, we measured the broadband (245–3300 nm) optical constants of ultrathin PtS2 and PtSe2 films to eliminate this gap and provide a foundation for optoelectronic device simulation. We discovered their broadband absorption and high refractive index both theoretically and experimentally. Based on first-principle calculations, we also predicted their giant out-of-plane optical anisotropy for monocrystals. As a practical illustration of the obtained optical properties, we demonstrated surface plasmon resonance biosensors with PtS2 or PtSe2 functional layers, which dramatically improves sensor sensitivity by 60 and 30%, respectively.

scholarly journals Synthesis of WS1.76Te0.24 alloy through chemical vapor transport and its high-performance saturable absorption

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhengting Du ◽  
Chi Zhang ◽  
Mudong Wang ◽  
Xuejin Zhang ◽  
Jian Ning ◽  
...  
Keyword(s):  
High Performance ◽  
Modulation Depth ◽  
Chemical Properties ◽  
Chemical Vapor ◽  
Vapor Transport ◽  
Chemical Vapor Transport ◽  
Saturable Absorption ◽  
Reasonable Approach ◽  
Metal Dichalcogenides ◽  
Physical And Chemical

AbstractLayered transitional metal dichalcogenides (TMDs) are drawing significant attentions for the applications of optics and optoelectronics. To achieve optimal performances of functional devices, precisely controlled doping engineering of 2D TMDs alloys has provided a reasonable approach to tailor their physical and chemical properties. By the chemical vapor transport (CVT) method and liquid phase exfoliation technique, in this work, we synthesized WS1.76Te0.24 saturable absorber (SA) which exhibited high-performance of nonlinear optics. The nonlinear saturable absorption of the WS1.76Te0.24 SA was also measured by the open aperture Z-scan technique. Compared to that of the binary component WS2 and WTe2, WS1.76Te0.24 SA has shown 4 times deeper modulation depth, 28% lower saturable intensity and a much faster recovery time of 3.8 ps. The passively Q-switched laser based on WS1.76Te0.24 was more efficient, with pulse duration narrowed to 18%, threshold decreased to 28% and output power enlarged by 200%. The promising findings can provide a method to optimize performances of functional devices by doping engineering.

scholarly journals Diode-Pumped Solid-State Q-Switched Laser with Rhenium Diselenide as Saturable Absorber

2018 ◽  
Vol 8 (10) ◽  
pp. 1753 ◽  
Author(s):  
Chun Li ◽  
Yuxin Leng ◽  
Jinjin Huo
Keyword(s):  
Solid State ◽  
Saturable Absorber ◽  
Modulation Depth ◽  
Transition Metal Dichalcogenides ◽  
Solid State Laser ◽  
Saturable Absorption ◽  
Average Output ◽  
Transmission Experiment ◽  
State Laser ◽  
Rhenium Diselenide

We report a solid-state passively Q-switched Nd:YVO4 laser adopting rhenium diselenide (ReSe2) as saturable absorber (SA) materials. ReSe2 belongs to a type of transition metal dichalcogenides (TMDs) materials and it has the weak-layered dependent feature beneficial for the preparation of few-layer materials. The few-layer ReSe2 was prepared by ultrasonic exfoliation method. Using a power-dependent transmission experiment, its modulation depth and saturation intensity were measured to be 1.89% and 6.37 MW/cm2. Pumped by diode laser and based on few-layer ReSe2 SA, the Q-switched Nd:YVO4 laser obtained the shortest Q-switched pulse width of 682 ns with the highest repetition rate of 84.16 kHz. The maximum average output power was 125 mW with the slope efficiency of 17.27%. Our experiment, to the best of our knowledge, is the first demonstration that used ReSe2 as SA materials in an all-solid-state laser. The results show that the few-layer ReSe2 owns the nonlinear saturable absorption properties and it has the capacity to act as SA in an all-solid-state laser.

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