Abstract Ultrafast fiber lasers with broad bandwidth and short pulse duration have a variety of applications, such as ultrafast time-resolved spectroscopy supercontinuum generation. We report simple compact all-fiber thulium-doped femtosecond laser mode-locked by carbon nanotubes. The oscillator operates in slightly normal cavity dispersion at 0.055 ps 2 delivers 152 fs pulses 52.8 nm 0.19 nJ energy. This is the shortest widest spectral width demonstrated from Tm-doped based on 1 or...

In this paper, we first achieve nanosecond-scale dissipative soliton resonance (DSR) generation in a thulium-doped double-clad fiber (TDF) laser with all-anomalous-dispersion regime, and also scale the average power up to 100.4 W by employing only two stage TDF amplifiers, corresponding gains of 19.3 14.4 dB, respectively. It is noted that both oscillator amplification system employ as gain medium for utilizing advantages high-gain-availability, high-power-handling...

We demonstrate an integrated all-fiber mid-infrared (mid-IR) supercontinuum (SC) source generated by a 1.95 μm master oscillator power amplifier system and single-mode ZBLAN (ZrF4–BaF2–LaF3–AlF3–NaF) fiber. The maximum average output is 10.67 W with spectral bandwidth covering from ∼1.9 to 4.1 μm. fiber silica are thermal-spliced enhance the robustness practicability of system. It is, best our knowledge, first high-power compacted mid-IR SC based on

High-energy square pulses operating in dissipative soliton resonance region are experimentally observed an erbium-doped figure-of-eight fiber laser with large net-normal dispersion for the first time to our knowledge.The is achieved by using nonlinear-amplifying-loop-mirror mode-locked technique.The output pulse duration broadens linearly increase of pump power, while peak power maintains a constant value.At maximum 620 mW, intracavity energy up 379.2 nJ, and average 14.02 mW.

We demonstrate, for the first time, to best of our knowledge, an all-fiber figure-of-9 double-clad Tm-doped fiber laser operating in dissipative soliton resonance (DSR) regime. Stable mode-locked rectangular pulses are obtained by using nonlinear amplifying loop mirror (NALM) technique. A long spool high-nonlinearity (HNLF) and a segment SMF-28 used enhance nonlinearity NALM obtain large all-anomalous Output power pulse energy further boosted three-stage master oscillator amplifier (MOPA)...

A stable noise-like (NL) mode-locked Tm-doped fiber laser (TDFL) relying on a nonlinear optical loop mirror (NOLM) was experimentally presented. Different from the previous NL TDFL with NOLM, entire polarization-maintaining (PM) construction utilized in our cavity, which makes oscillator have better resistance to environmental perturbations. The robust can deliver bound-state pulses pulse envelope tunable ~14.1 ns ~23.6 and maximum energy of ~40.3 nJ at repetition rate ~980.6 kHz. Meanwhile,...

Herein, we presented a high energy noise-like (NL) pulse Tm-doped fiber laser (TDFL) system. Relying on the nonlinear amplifying loop mirror (NALM), stable pulses with coherence spike width of ∼317 fs and envelope ∼4.2 ns were obtained from an all polarization-maintaining fiberized oscillator at central wavelength ∼1946.4 nm 3 dB bandwidth ∼24.9 nm. After amplification in all-fiberized TDF amplifier system, maximum average output power ∼32.8 W ∼10.1 µJ obtained, which represents highest NL...

Recently, laser polishing, as an effective post-treatment technology for metal parts fabricated by powder bed fusion (LPBF), has received much attention. In this paper, LPBF-ed 316L stainless steel samples were polished three different types of lasers. The effect pulse width on surface morphology and corrosion resistance was investigated. experimental results show that, compared to the nanosecond (NS) femtosecond (FS) lasers, material's sufficient remelting realized continuous wave (CW) in a...

We report a tunable spatiotemporally mode-locked large-mode-area Er:ZBLAN fiber laser based on the nonlinear polarization rotation technique. A diffraction grating is introduced to select operating wavelength. Under spectral and spatial filtering effects provided by coupling respectively, stable ps-level pulses around 2.8 µm with repetition rate of 43.4 MHz are generated. Through careful adjustment grating, broad wavelength tuning range from 2747 2797 nm realized. To best our knowledge, this...

Herein, the efficiently high‐power pulsed Raman lasers with wavelength above 2.1 μm are experimentally demonstrated relying on stimulated scattering. A tailored noise‐like pulse (NLP) fiber laser system centered at ≈1953 nm a maximum output power of ≈10.9 W is served as pump source. By directly pumping section highly Ge‐doped silica fiber, first (centered at≈2139 nm) and second ≈2353 powers ≈3.8 ≈0.25 obtained, respectively, which represent highest NLP these regions, to best knowledge....

Herein, we present a fundamental and harmonic mode-locked figure-of-9 thulium-doped fiber laser using nonlinear amplifying loop mirror. The generated h-shaped pulse is centered at 1889 nm with an average output power reaching 282 mW energy up to 1.23 µJ, which the highest of pulse. In regime, 8th obtained. detailed characteristics are discussed. proposed study shows that can generate pulses also allows generation nanosecond µJ-level energy.

In this paper, we demonstrate a simplified one-to-many scheme for efficient mid-infrared (MIR) parametric conversion. Such is based on continuous wave (CW) single longitudinal mode master oscillator power-amplifier (MOPA) fiber system as the signal source and picosecond pulsed MOPA system, exhibiting multiple modes, pump source. The beams are combined co-coupled into piece of 50-mm long 5% MgO-doped PPLN crystal As high ∼3.82 W average power at central idler wavelength ∼3.4 µm achieved when...

The conventional near-infrared laser transmission welding (LTW) process for joining dissimilar transparent polymers is limited by the need to incorporate optical absorbents, which compromises joint performance and raises biocompatibility concerns. To address these issues, this study proposed a surface modification technique using femtosecond ablation prior process. Experiments involved 520 nm of polymers, followed LTW an 808 laser, with subsequent characterization mechanical property...

Surface-enhanced Raman scattering (SERS) sensors combined with superhydrophobic/superhydrophilic (SH/SHL) surfaces have shown the ability to detect ultra-low concentrations. In this study, femtosecond laser fabricated hybrid SH/SHL designed patterns are successfully applied improve SERS performances. The shape of SHL can be regulated determine droplet evaporation process and deposition characteristics. experimental results show that uneven along edges non-circular facilitates enrichment...

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We report on the generation of tunable and switchable dual-wavelength dissipative solitons (DSs) in a weak-birefringence all-normal-dispersion Yb-doped fiber laser based nonlinear polarization rotation technique. By virtue operation, DSs with wide wavelength-tunable range variable wavelength spacing are observed for first time. The is result from similar order magnitude between controller-induced birefringence change birefringence. It suggested that widely could be realized through...

We fabricated three kinds of double cladding nonlinear seven-core photonic crystal fibers (PCFs) with different group velocity dispersion (GVD) properties and fundamental supermode output. Pumped by a 150 ps polarization maintaining ytterbium-doped fiber laser based on the gain-switched technique, octave-spanning supercontinua were generated within wavelengths from 450 to at least 2000 nm in these high spatial quality.

We report a 100-W-level, repetition rate and pulsewidth tunable, all-fiber, thulium-doped master oscillator power amplifier system. The was actively Q-switched by fiber-coupled acousto-optic modulator. generated could be tuned from 1.16 μm to 46.3 ns adjusting modulation 1 kHz 2 MHz, the pulse (PRR) can also correspondingly. maximum output boosted > 110 W (slope efficiency of 55%) through three-stage fiber (TDF) amplifiers at PRR 100 MHz. spectrum bandwidth about 0.8 nm without obvious...

Poor miscibility is an important reason for the non-weldable performance of most dissimilar polymers and their composites, traditional surface treatments cannot effectively improve weldability polymers. Therefore, non-weldability one factors that limit application composites. We proposed a modification scheme laser ablation or etching to immiscible effectively. Experimental studies on femtosecond ultraviolet (UV) ablation/etching, mid-infrared transmission welding (LTW), related...

We present a nonlinear amplifying loop mirror-based mode-locked fiber laser. By adjusting the pump power, proposed laser exhibits dissipative soliton resonance (DSR)-like pulse operation with maximum width of 150 ns. Subsequently, three-stage Tm