A 2 micron passively Q-switched bulk state pulsed laser based on WS<sub>2</sub>

Wang, Xihu; Xu, Jinlong; Gao, Shanxing; Liu, Yunyun; You, Zhenyu; Tu, Chaoyang

doi:10.1039/c7ra07627d

Cited by 15 publications

(10 citation statements)

References 26 publications

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“…Note that there is almost no Na related states appearing around the band edge, indicating that the Na atoms only contribute to constructing the structure skeleton of NaNbO 3 , but has negligible effects on the electronic structures near the Fermi level. All these obtained results agree well with the previous experimental values and theoretical results, [20,36,37] implying that the computational methods and parameters adopted here are suitable for examining NaNbO 3 .…”

Section: Pure Nanbosupporting

confidence: 90%

“…E 0 is and E VBM of NaNbO 3 are calculated to be −0.68 and 2.62 eV, respectively, which agrees well with the previous theoretical results. [36,37] Besides, the valence band maximum (VBM) and conduction band minimum (CBM) positions for doped systems can be obtained and aligned with the pure one by referencing to the 3s core levels of the Nb atom farthest from the anionic impurities.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, theoretical investigations from Wang and Modak predicted that Mo-N and W-N codoped NaNbO 3 were promising visiblelight photocatalysts for solar water splitting because they have decreased band gap as well as appropriate band edge positions. [36,37] Besides cation-anion codoping, codoping with two anionic elements has emerged as an effective path for band gap engineering of the perovskite-type photocatalysts, such as SrTiO 3 , Sr 2 Nb 2 O 7 , NaTaO 3 , and KNbO 3 . [38][39][40][41][42] The double-hole-mediated coupling between the anionic dopants creates fully filled delocalized intermediate bands lying above the valence band, thus not only the band gap is reduced significantly but also the overall stability is improved.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

Wang

Teng

et al. 2019

Int J of Quantum Chemistry

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Doping is an effective strategy to improve the photocatalytic performances of semiconductor photocatalyst for water splitting. In this work, we perform extensive hybrid density functional calculations to investigate perovskite NaNbO3 with anionic monodoping with N, C, P, and S dopants as well as with (N + N), (C + S), and (N + P) codoping pairs. Theoretical results clearly reveal that the band structures of NaNbO3 can be effectively tailored by introducing double‐hole‐mediated coupling of anion‐anion pairs. Compared with the monodoping cases, the anion‐anion codoped NaNbO3 systems not only have substantially narrowed band gaps, but also can eliminate the unoccupied localized states appearing above the Fermi level, which are disastrous for photocatalysis as they may trap the photogenerated carriers. Optical absorption curves further convince that the codoped NaNbO3 can effectively harvest visible light. The band edge positions with respect to the redox potentials of water demonstrate that the (N + N) codoped NaNbO3 are desirable for efficient solar water splitting.

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Section: Pure Nanbosupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

Wang

Teng

et al. 2019

Int J of Quantum Chemistry

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“…Q‐switching lasers based on WS 2 SAs also exhibit the excellent performance. [ 240–242 ] For instance, Wang et al. reported that Q‐switching pulsed laser with WS 2 SA had a pulse of 430 ns, a pulse energy of 5.4 µJ, and a repetition rate from 64 to 90 kHz operating at 1.9 µm.…”

Section: Applicationsmentioning

confidence: 99%

2D WS₂: From Vapor Phase Synthesis to Device Applications

Lan

et al. 2020

Adv Elect Materials

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The discovery of graphene has triggered the research on 2D layer structured materials. Among many 2D materials, semiconducting transition metal dichalcogenides (TMDs) are widely considered to be the most promising ones due to their excellent electrical and optoelectronic characteristics. Tungsten disulfide (WS2) is a kind of such TMDs with fascinating properties, such as the high carrier mobility, appropriate band gap, strong light–matter interaction with the large light absorption coefficient, very large exciton binding energy, large spin splitting, and polarized light emission. All these interesting properties can make the 2D WS2 being highly favorable for applications in memristors, light‐emitting devices, optical modulators, and many others. Here, the comprehensive review on the properties, vapor phase synthesis, electronic and optoelectronic applications of 2D WS2 is presented. This review does not only serve as a design guideline to elevate the material quality of 2D WS2 films via enhanced synthesis approaches, but also provides valuable insights to various strategies to improve their device performances. With the fast development of wafer‐scale synthesis methods and novel device structures, 2D WS2 can undoubtedly be a rising star for the next‐generation devices in the near future.

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“…With the development of the laser technology, high‐performance fiber lasers and high‐quality ultrashort laser pulse become more reliable. Since 1990, the SA that made of various materials has been emerging, such as carbon nanotubes (CNTs), black phosphorus, SnS 2 , MoS 2 , and WS 2 . Over the past several years, the metal sulfide, such as PbS NP, has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

PbS Nanoparticles for Ultrashort Pulse Generation in Optical Communication Region

Zhang

Qyyum

et al. 2018

Part & Part Syst Charact

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Lead sulfide (PbS) has attracted great attention due to its unique electronic, optical, and chemical properties. In particular, the narrow bandgap of PbS (≈0.37 eV) makes it very suitable for the ultrafast application in optical communication or even longer wavelength region. In this work, PbS nanoparticles' (NPs) dispersion without any polymer is utilized as saturable absorber (SA) to generate ultrafast pulse in a fiber ring laser for the first time. The characterization and nonlinear properties of PbS NPs are investigated experimentally. PbS NPs are deposited on a flange to compose a nonlinear device. The nonlinear absorption is measured by a power‐dependent method with a modulation depth of 12.2%. Most importantly, PbS NPs can be applied for the ultrafast photonics applications. A compact mode‐locked fiber laser with 1.01 ps pulse duration, 2.93 nm spectral width, and 3.97 MHz repetition rate at 1533 nm is successfully achieved with long time stability. The output laser is detected with a good stability for more than 1 month without any degradation. This work can demonstrate that the PbS NPs' dispersion is indeed a new and excellent photonics material for SA photonics, photoconductive detection, and optical modulator, etc.

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A 2 micron passively Q-switched bulk state pulsed laser based on WS₂

Abstract: We report a 2 micron passively Q-switched bulk state pulsed laser with a pulse of 430 ns based on graphene-like 2D WS2 nanosheets.

Cited by 15 publications

References 26 publications

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

2D WS₂: From Vapor Phase Synthesis to Device Applications

PbS Nanoparticles for Ultrashort Pulse Generation in Optical Communication Region

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A 2 micron passively Q-switched bulk state pulsed laser based on WS2

Abstract: We report a 2 micron passively Q-switched bulk state pulsed laser with a pulse of 430 ns based on graphene-like 2D WS2 nanosheets.

Cited by 15 publications

References 26 publications

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO3 for efficient solar water splitting

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO3 for efficient solar water splitting

2D WS2: From Vapor Phase Synthesis to Device Applications

PbS Nanoparticles for Ultrashort Pulse Generation in Optical Communication Region

Contact Info

Product

Resources

About

A 2 micron passively Q-switched bulk state pulsed laser based on WS₂

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

Double‐hole‐mediated coupling of anionic dopants in perovskite NaNbO₃ for efficient solar water splitting

2D WS₂: From Vapor Phase Synthesis to Device Applications