Abstract In recent years, 2D layered materials, including graphene, topological insulators, transition metal dichalcogenides, black phosphorus, MXenes, graphitic carbon nitride, and metal‐organic frameworks, have attracted considerable interest due to their potential applications in the fields of physics, chemistry, biology, energy. Their rise field nonlinear photonics began around 2009 has become an important research direction. Here, synthesis techniques, optical properties, integration...

Few-layer bismuthene is an emerging two-dimensional material in the fields of physics, chemistry, and science. However, its nonlinear optical property related photonics device have been seldom studied so far. Here, we demonstrate a sub-200 fs soliton mode-locked erbium-doped fiber laser (EDFL) using microfiber-based saturable absorber for first time, to best our knowledge. The nanosheets are synthesized by sonochemical exfoliation method transferred onto taper region microfiber deposition...

The simultaneous and independent measurements of in-plane out-of-plane displacements are significant issues to be solved in research. Here a novel system realize single-spot two-dimensional (2D) displacement measurement noncooperative target is reported. performance the tested an aluminum with rough surface. 2D random movement different parameters Lissajous figures measured by system. ranges reach 500 μm accuracies submicron scale. resolutions two dimensions all better than 5 nm. based on...

Ultrafast lasers play an important role in a variety of applications ranging from optical communications to medical diagnostics and industrial materials processing. Graphene other two-dimensional (2D) noncarbon materials, including topological insulators (TIs), transition metal dichalcogenides (TMDCs), phosphorene, bismuthene, antimonene, have witnessed very fast development both fundamental practical aspects ultrafast photonics since 2009. Their unique nonlinear properties enable them be...

We propose and demonstrate the cascaded multi-wavelength mode-locked erbium-doped fiber laser (EDFL) based on ultra-long-period gratings (ULPGs) for first time, to best of our knowledge. Study found that ULPG can be used as both a mode-locker pulse shaping comb filter generation simultaneously. Using dual-function ULPG, three-, four-, five-, six-, seven-wavelength pulses are obtained in EDFL, seven which largest number wavelengths up now. For four-wavelength soliton pulses, their width is...

The ubiquity of smartphones has introduced an addiction phenomenon, which may attenuate the role sense coherence in enhancing social support and satisfaction with life. Utilizing self-regulation theory, this study we examined mediating relationship between life, as well moderating smartphone support. Survey results from 547 undergraduate students China indicated that partially mediated Furthermore, frequency use increased, positive impact on diminished. practical implications these findings...

We reported on the generation of dual-wavelength rectangular pulse in an erbium-doped fiber laser (EDFL) with a topological insulator saturable absorber. The could be stably initiated width from 13.62 to 25.16 ns and fundamental repetition rate 3.54 MHz by properly adjusting pump power polarization state. In addition, we verified that shape can affected total net cavity dispersion laser. Furthermore, rotating controllers, harmonic mode-locking operation was also obtained. EDFL would benefit...

Recently, few-layer WS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , as a novel two-dimensional (2D) material, has been discovered to possess both the saturable absorption effect and huge nonlinear refractive index. In experiment, by taking advantage of unique optical properties 2D we fabricated highly photonic device using pulsed laser beam deposit film onto fiber taper. With -based taper, have demonstrated single-and...

In this paper, we demonstrated the direct generation of dip-type sidebands from a passively mode-locked fiber laser based on evanescent field interaction two-dimensional material WS2 and microfiber. The nanosheets in polyvinyl alcohol solution are prepared through liquid-phase exfoliation method transferred onto tapered by optical deposition method. WS2-deposited microfiber device could both operate as mode-locker for soliton induce strong polarization effect to constitute an artificial...

We show that a high-energy electron bunch can be used to capture the instantaneous longitudinal and transverse field structures of highly transient, microscopic, laser-excited relativistic wake with femtosecond resolution. The spatiotemporal evolution wakefields in plasma density up ramp is measured reversal wake, where wavelength at particular point space increases until disappears completely only reappear later time but propagating opposite direction, observed for first by using this new technique.

We report on the generation of dual-wavelength mode-locked pulses in an erbium-doped fiber laser incorporating a 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> /Polyvinyl Alcohol (PVA) film which could operate as both excellent saturable absorber (SA) for mode-locking and high-nonlinear medium mitigating mode competition stabilizing oscillation. The TI:...

We experimentally demonstrate a multi-wavelength ultrafast erbium-doped fiber laser incorporating μm-scale topological insulator: Bi2Se3/Polyvinyl Alcohol film as both an excellent saturable absorber for mode-locking and high-nonlinear medium to induce giant third order optical nonlinear effect mitigating the mode competition of stabilizing oscillation. By properly adjusting pump power polarization state, single-, dual-, triple-, four-wavelength pulse could be stably initiated. For...

Abstract Mid‐infrared (mid‐IR) ultrafast lasers are widely employed in biomedicine, molecular spectroscopy, material processing, and nonlinear optics. With the improvement of fiber gain media other optical elements, low‐cost, compact, high‐efficiency open up new opportunities for 2–4 µm pulse generations, which calls a comprehensive review their mode‐locking mechanisms, media, laser system performance. This paper, beginning with an overview pulse‐generation technologies, reviews recent...

A method for simulating electrorheological (ER) fluids is developed using LAMMPS (large-scale atomic, molecular massively parallel simulator) dynamics simulations, aiming to model and analyze the microstructure rheological behavior of ER under an electric field. The results demonstrate that our simulation accurately captures microstructural changes in fluids, data show impressively high level consistency when compared directly with experimental data. main innovation lies simultaneous...

Abstract Pulsed solid‐state lasers comprise 2D materials as saturable absorbers that contain transparent windows of the atmosphere and characteristic fingerprint spectra several vital molecules are significant in various applications research. Over past few decades, progress has been made development narrow pulse width, high energy, average output power, efficiency, simple construction passively Q‐switched mode‐locked with absorbers. This review summarizes materials, including graphene,...

Objective To explore the association of wearable device-measured moderate-to-vigorous intensity physical activity (MVPA) with cardiovascular disease (CVD) risk in long-term cancer survivors. Methods This retrospective analysis involved a prospective cohort 6109 survivors without CVD from UK Biobank accelerometry subsample. The MVPA volume is categorised into four groups based on guideline recommendations (0–75 min/week, 75–150 150–300 ≥300 min/week). Cox proportional hazard models are used...

We numerically and experimentally study a multiwavelength fiber laser (MWFL) employing nonlinear Brillouin optical loop mirror (NBOLM). Taking into account the impact of stimulated scattering (SBS) effect on polarization evolution, we present power transmission equation Stokes lines from NBOLM. Thereafter, combine equation, coupled wave equations SBS process in NBOLM, rate propagation erbium-doped (EDF) to build up model for MWFL. Using this model, can explain impacts EDF pump power, input...

Bound solitons have become a hot topic in the field of nonlinear optics due to their potential applications optical communication, information processing and radar systems. However, trapping cascaded bound soliton is still major challenge up now. Here, we propose experimentally demonstrate multi-pulse fiber laser based on MoTe2 saturable absorber. In experiment, nanosheets were synthesized by chemical vapor deposition transferred taper deposition. Then, inserting absorber into ring cavity...

A wavelength tunable, dark pulse, and bright pulse-switched dual-wavelength fiber ring laser is reported. Through adding high nonlinear optical as a medium in the cavity, double-wavelength dark-bright pulse pair can be formed. The separation of achieved by polarization beam splitter. with orthogonal correspond to different wavelengths, respectively. Then, via tunable filter controller out we need adjust polarization, interconversion same tunableness wavelengths our laser.

A new method for diagnosing the temporal characteristics of ultrashort electron bunches with linear energy chirp generated from a laser wakefield accelerator is described. When ionization-injected bunch interacts back drive laser, it deflected and stretched along direction electric field laser. Upon exiting plasma, if goes through narrow slit in front dipole magnet that disperses electrons plane polarization, can form series bunchlets have different energies but are separated by half...

We demonstrate a 2.8 μm mid-infrared Er-doped ZBLAN mode-locked fiber laser by employing transition metal dichalcogenides (TMD) as saturable absorber mirror (SAM) for the first time. The TMD-SAM with large modulation depth of 24% was fabricated transferring chemical-vapor-deposited high-quality large-area few-layer WSe2 on gold-coated mirror. Stable pulses 21 ps were obtained repetition rate 42.43 MHz and an average output power up to 360 mW.