A5023390626- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Advanced Fiber Optic Sensors
- Solid State Laser Technologies
- Optical Network Technologies
- Photonic and Optical Devices
- Optical Coherence Tomography Applications
- Semiconductor Lasers and Optical Devices
- Chalcogenide Semiconductor Thin Films
- Nonlinear Photonic Systems
- Orbital Angular Momentum in Optics
- Advanced Thermoelectric Materials and Devices
- Perovskite Materials and Applications
- Random lasers and scattering media
- Advanced Optical Network Technologies
- Topological Materials and Phenomena
- Thermal properties of materials
- Quantum optics and atomic interactions
- 2D Materials and Applications
Ningbo University
2017-2024
National Engineering Research Center of Electromagnetic Radiation Control Materials
2017-2024
Nanyang Technological University
2016-2018
Xiamen University
2011-2017
Xiamen University of Technology
2015-2016
Passive Q-switching or mode-locking by placing a saturable absorber inside the laser cavity is one of most effective and popular techniques for pulse generation. However, current absorbers cannot work well in visible spectral region, which seriously impedes progress passively Q-switched/mode-locked pulsed fibre lasers. Here, we report kind absorber-two-dimensional transition-metal dichalcogenides (TMDs, e.g. WS2, MoS2, MoSe2), successfully demonstrate compact red-light Q-switched...
In this paper, Topological insulator (TI) Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> as a saturable absorber (SA) is exploited to Q-switch fiber lasers at 2 μm wavelength for the first time. Few-layer TI:Bi 2Se 3 nanosheets in CS-HAc solution are prepared by liquid-phase exfoliation method, and thin 2-D structure with thickness of 3-5 layers well characterized. The...
We have demonstrated a high-energy Q-switched double-clad thulium-doped fiber laser (TDFL) using graphene-oxide-deposited tapered (GODTF) device as saturable absorber operating at wavelength of 2 μm for the first time. Because side-interaction graphene-oxide with evanescent field on taper waist, GODTF devices potential offering high damage threshold. Using 788 nm diode pump source, TDFL generated stable single transverse mode pulses pulse energy 6.71 μJ (corresponding to an average power 302...
Gold nanoparticle (GNP) possesses saturable absorption bands in the visible region induced by surface plasmon resonance (SPR). We firstly applied GNP as a absorber (SA) for red Q-switched pulse generation. The GNPs were embedded polyvinyl alcohol (PVA) film-forming and inserted into praseodymium (Pr(3+))-doped fiber laser cavity to achieve 635 nm passive Q-switching. has wide range of pulse-repetition-rate from 285.7 546.4 kHz, narrow width 235 ns well maximum output power 11.1 mW. results...
We experimentally confirm that graphene within fiber laser cavities can generate four-wave-mixing (FWM) by observing the spectral broadening and transition from single-longitudinal-mode oscillation to multiple-longitudinal-mode one. Then, simultaneously exploiting graphene-induced nonlinear FWM its super-broadband saturable absorption, we further achieve for first time best of our knowledge, multiwavelength Q-switched Yb <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We experimentally demonstrated compact orange-light passively Q-switched praseodymium (Pr3+)-doped all-fiber lasers utilizing two-dimensional (2D) transition-metal dichalcogenides (TMDs, WS2 and MoS2) as saturable absorbers (SAs). The filmy TMDs SAs are fabricated by evaporating the composite of nanosheets polyvinyl alcohol (PVA), then inserted into an Pr3+-doped fiber laser cavity, which is designed coating dielectric mirrors on ends. Stable orange at 604 nm successfully achieved. passive...
In this paper, a compact passively Q-switched praseodymium (Pr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> )-doped fiber laser at the wavelength of 635 nm with black phosphorus (BP) saturable absorber (SA) was first investigated. BP nanoflakes were manufactured by liquid-phase-exfoliation method and then embedded into polyvinyl-alcohol (PVA) film for experimental usage pigtail mirror (FPM, coating dielectric onto fiber-end face)...
A high-efficiency and broadband tunable chalcogenide fiber Raman laser with the Fabry–Perot (F–P) cavity formed by Fresnel reflection was established. maximum average power slope efficiency of around 43% a output peak about 2.9 W at 2148 nm were demonstrated using 2 µm nanosecond pump source. The shows broadened pulse width 674 ns tunability central wavelength from 2100 to 2186 nm. constituted endfaces can operate any without aid additional optical feedback element. This will facilitate...
Passive Q-switching of praseodymium (Pr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> )-doped fiber lasers at 635 nm with topological insulators (TIs) saturable absorbers (SAs) was experimentally demonstrated for the first time. TIs (Bi <sub xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , Bi Te ) nanosheets were embedded in polyvinyl alcohol film-forming and incorporated into...
We demonstrate a watt-level mid-infrared supercontinuum source, with the spectrum covering infrared region from 2 to 6.5 µm, in an all-fiber structured laser transmission system. To further improve SC spectral bandwidth, power and system compactness follow-up As S 3 fiber, we theoretically experimentally explored some knotty problems that would potentially result fiber end-facet failure low output during high-power butt-coupling process proposed optimal coupling distance on premise of safety...
A copper-nanowire (CuNWs)-based saturable absorber (SA) is utilized as a new Q-switcher for pulsed operations in visible regions. The plasmon resonance effect of CuNWs contributes to inducing the absorption property. By incorporating CuNWs-based SA into red praseodymium Pr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> -doped ZBLAN fiber laser cavity, light shifts from continuous wave (CW) state stable operation state. When it changes...
We report on the experimental observation of bound states solitons in an erbium-doped mode-locked fiber laser using a microfiber-based WS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> κ saturable absorber (SA). By carefully adjusting polarization state cavity, two with various pulse separations from 5.40 to 75.14 ps and three separation 23.88 are obtained. Single- multiple-pulses emissions also observed by changing pump power...
We demonstrate the passive synchronization of two large-energy Q-switched all-fiber lasers, operating at 1.06 and 1.53 μm, by sharing a common monolayer graphene Q-switcher. The fiber-compatible Q-switcher is constructed transferring CVD nanosheet onto fiber ferrule. By exploiting broadband saturable absorption optimizing cavity designs, both Yb Er/Yb double-clad lasers are successfully synchronized. Q-switching can be realized in broad repetition-rate range 9-20 kHz adjusting pump powers...
We demonstrate the self-mode-locking operation of a thulium (Tm)-doped fiber laser (TDFL) with simple linear cavity. Since cavity does not include any specific mode-locker, we experimentally investigate and analyze mechanism. The mode-locking is attributed to combination self-phase modulation effect weak saturable absorption high-concentration Tm-doped fiber. mode-locked TDFL operates at central wavelength 1985.5 nm 3 dB spectral linewidth 0.18 nm. generates large pulse energy 32.7 nJ pulsed...
We demonstrate a large-energy, wavelength-tunable, all-fiber passively Q-switched Er:Yb-codoped laser using mono-layer chemical vapor deposition (CVD) graphene saturable absorber (SA). By exploiting the large gain of Er:Yb double-clad fiber and optimizing coupling ratio output coupler, not only can CVD SA be protected from oversaturation thermal damage, but also pulse energy up to 1.05 μJ (corresponding average power 25.6 mW) is thus achieved. Using tunable Fabry-Perot filter, stable pulses...
Metafibers expand the functionalities of conventional optical fibers to unprecedented nanoscale light manipulations by integrating metasurfaces on fiber tips, becoming an emerging light-coupling platform for both nanoscience and optics communities. Mostly exploring isolated bare fibers, current metafibers remain as proof-of-concept demonstrations due a lack standard interfaces with universal networks. Here, we develop new methodologies fabricate well-defined plasmonic directly end facets...
In this letter, a compact Q-switched red (635.7 nm) praseodymium (Pr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> )-doped fluorozirconate fiber laser using graphene-oxide (GO) as saturable absorber (SA) is demonstrated experimentally. Furthermore, silica end coated with dielectric film was employed to construct the resonator. The possesses wide range of pulse repetition rate from 64.1 195.3 kHz and minimum duration 554 ns. This first...
We designed and fabricated a double-layered structure Er3+:Ta2O5 waveguide investigated its optical amplification performance in C band. The pump laser threshold for zero gain at 1533 nm was 2.5 mW, the internal net ∼4.63 dB/cm lunched power of 36.1 mW 980 signal input -30.0 dBm (1 µW). relationship between also investigated, large 10.58 achieved ∼-47.1 dBm. results confirm potentials use Ta2O5 as host material amplification.
A novel intermode beating mode-locking (IBML) technique combined with a cascaded Raman process is proposed to mode-lock an O-band two-cascaded fiber laser. Using 980-m-long phosphosilicate pumped by 1064 nm laser, the second-order oscillation at 1319 generated mixed-cascaded shifts of P2O5 and SiO2. By precisely matching frequencies pump laser cavity frequency, harmonic initiated. The dynamic IBML operation in experimentally investigated. 131st-order repetition rate 27.247 MHz very stable...