We demonstrate a compact Q-switched dual-wavelength erbium-doped fiber (EDF) laser based on graphene as saturable absorber (SA). By optically driven deposition of core, the SA is constructed and inserted into diode-pumped EDF cavity. Also benefiting from strong third-order optical nonlinearity to suppress mode competition EDF, stable Q-switching operation has been achieved using two-reflection peak Bragg grating external cavity mirror. The low pump threshold 6.5mW at 974nm wide range...

We propose and demonstrate 1, 1.5, 2 μm passively Q-switched fiber lasers by exploiting a few-layer Molybdenum sulfide (MoS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) polymer composite as broadband saturable absorber (SA), respectively. The MoS nanosheets are prepared the liquid-phase exfoliation method, composited with polyvinyl alcohol (PVA). PVA-MoS film is sandwiched between two ferrules to form fiber-compatible SA. not only...

Passive Q-switching of an ytterbium-doped fiber (YDF) laser with few-layer topological insulator (TI) is, to the best our knowledge, experimentally demonstrated for first time. The TI: Bi2Se3 (2-4 layer thickness) is fabricated by liquid-phase exfoliation method, and has a low saturable optical intensity 53 MW/cm2 measured Z-scan technique. deposition technique used induce TI in solution onto ferrule successfully constructing fiber-integrated TI-based absorber (SA). By inserting this SA into...

We propose and demonstrate a MoS2-based passively Q-switched Er-doped fiber laser with wide tuning range of 1519.6-1567.7 nm. The few-layer MoS2 nano-platelets are prepared by the liquid-phase exfoliation method, then made into polymer-composite film to construct fiber-compatible saturable absorber (SA). It is measured at 1560 nm wavelength, that such SA has modulation depth ∼ 2% optical intensity 10 MW/cm(2). By further inserting filmy MoS2-SA an laser, stable Q-switching operation 48.1...

We report on the first passively Q-switched Nd:YAlO₃ laser at ~1079.5 nm using MoS₂ as saturable absorber. The absorber is fabricated by transferring liquid-phase-exfoliated nanosheets onto a BK7 glass substrate. By inserting into plano-concave cavity, we obtain stable operation with maximum average output power of 0.26 W corresponding to pulse repetition rate 232.5 kHz, width 227 ns and energy about 1.11 μJ. results experimentally confirm promising application new kind 2D material,...

This work presents the saturable absorption (SA) properties of CsPbBr3 perovskite quantum dots (QDs). The QDs show excellent SA performance with a nonlinear coefficient −35×10−2  cm/GW and figure merit 3.7×10−14  esu cm. Further, their use as absorbers in passively Q-switched visible solid-state laser for generation soliton pulses is demonstrated. These results demonstrate potential to act absorbers.

We report continuous-wave (CW) laser operation of Pr3+-doped LiLuY4, LiYF4 and KY3F10 single crystals in the Red, Orange Green spectral regions by using a new pumping scheme. The pump source is an especially developed compact, slightly tunable intracavity frequency-doubled diode-pumped Nd:YAG delivering CW output power 0.9W at 469.12 nm. At this wavelength, efficient room temperature emissions corresponding to 3P0→3F2, 3P0→3H6 3P1→3H5 Pr3+ transitions are observed. While maximum slope...

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 report on a1.3 μm Q-switched laser operation based LD-end-pumped Nd:LiYF₄ (YLF) crystal firstly using few-layer topological insulator (TI) Bi₂Se₃ as saturable absorber (SA). The TI SA is fabricated by transferring the liquid-phase-exfoliated nanosheets onto a BK7 glass substrate. After free-running operation, inserted into concave-plano cavity and finally stable achieved with maximum average output power of close to 0.2 W corresponding pulse repetition rate 161.3 kHz, shortest width 433...

Dynamic cholesteric liquid crystal superstructures with rationally designed arrangements of in-plane helical axes are enabled by utilizing a digital micromirror device-based photoalignment technique, resulting in unique fingerprint textures for potential advanced photonic applications. General rules behind the axis manipulation investigated and growth spiral wave-like continuous gratings demonstrated.

Abstract Spatiotemporal mode‐locking (STML) in fiber lasers are of interest applications such as optical communications, nonlinear imaging, and precision machining. To date, STML the near‐infrared region have been well demonstrated, yet operation at visible wavelengths is still challenging. Here, a picosecond laser 635 nm with implementation Pr/Yb co‐doped few‐mode polarization rotation technology reported. By solving modified generalized multimode Schrödinger equation, formation...

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"...

Mode-locked pulses in the dissipative soliton resonance (DSR) regime enable extremely high pulse energy, but typically have limited peak power of <100 W and a nanosecond-long duration. In this Letter, we demonstrate high-peak-power, ultrashort DSR compact Er:Yb co-doped double-clad fiber laser. The linear cavity is simply formed by two loop mirrors (FLMs) using 50/50 optical coupler (OC) 5/95 OC. FLM with short length 3 m not only used as output mirror, also acts nonlinear mirror for...

We propose and demonstrate multiwavelength dissipative soliton (DS) generation in an all-normal-dispersion ytterbium-doped fiber laser based on a graphene-deposited tapered (GDTF) device. Due to the interaction of graphene with evanescent field taper, GDTF device possesses characteristics both saturable absorption polarizing effect. Therefore, this not only initiates mode-locking operation absorption, but also induces special spectral filtering nonlinear polarization evolution for shaping...

We propose a new method to determine topological charge by using an improved Fizeau interferometer. This interferometer is very easy realize, as well interference fringes are distinct. Phases of vortex, Hermite-Gaussian, and elliptical vortex beams experimentally verified this method. It provides convenient way the sign magnitude charge. may have some potential applications in space optical communication.

We report on the direct generation of passively mode-locked vortex lasers in visible spectral region, for first time to best our knowledge, using a Pr:LiYF4 (Pr:YLF) crystal as gain medium. A stable TEM00 mode has been achieved with maximum average output power 75 mW graphene saturable absorber mirror. The pulse width is measured be short about 73.4 ps at repetition rate 140 MHz, and laser wavelength 721 nm 0.5 nm. By slightly misaligning resonator, first-order Laguerre-Gaussian (LG0,1) also...

Ministry of Education, Science, Sports and Culture Japan; Russian Foundation for Basic Research; Presidium Academy Sciences.

We numerically and experimentally analyze the output characteristics pulse dynamics of carbon nanotube mode-locked fiber lasers near zero cavity dispersion (from 0.02 to ~-0.02 ps(2)). focus on such cavities reveal related transition between different mode-locking regimes (such as soliton-like, stretched-pulse self-similar regimes). Using our proposed model, we develop a nanotube-mode-locked laser setup generating ~97 fs which operates in regime. The corresponding experimental results are...

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...