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 demonstrate the fabrication of graphene-deposited tapered fibers (GDTFs), which can be used as saturable absorbers (SAs) for pulsed lasers. The advantages GDTF SAs include flexibility, all-fiber configuration, and high optical damage threshold. process is based on interaction evanescent field a fiber with graphene. By in situ monitoring transmitted power, deposition controlled, desirable level nonsaturable absorption loss fabricated. also study dynamic by employing different waist...

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...

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...

A passively mode-locked Yb3+-doped fiber laser with a fundamental repetition rate of 5 GHz and wavelength tunable performance is demonstrated. piece heavily phosphate high net gain coefficient 5.7 dB/cm, in conjunction mirror by directly coating the SiO2/Ta2O5 dielectric films on ferrule exploited for shortening cavity to 2 cm. The oscillator has peak 1058.7 nm, pulse duration 2.6 ps, signal signal-to-noise ratio 90 dB. Moreover, found be continuously tuned from 1056.7 1060.9 nm increasing...

Fundamental repetition rates of 3.1 GHz, 7.0 and 12.5 GHz in passively modelocked Yb-doped fiber lasers are demonstrated. To the best our knowledge, fundamental rate is highest value for 1.0 μm mode-locked lasers. The oscillator has a peak wavelength 1047.5 nm pulse duration 1.9 ps. signal signal-to-noise ratio 57 dB. spectra gradually makes blue-shift threshold power increases with an increase rate. Furthermore, contrast to most all-normal-dispersion lasers, present linear resonator (e.g.,...

We propose and demonstrate a compact passively mode-locked Tm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> -doped fiber laser with fundamental repetition rate up to 1.6 GHz. A 5.9 cm home-made, heavily barium gallo-germanate glass gain coefficient of 2.3 dB/cm at 1950 nm is employed as medium. The Fabry-Perot (FP) cavity contains mirror by directly coating the SiO <sub xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> /Ta O...

A kHz-order linewidth controllable 1550 nm single-frequency fiber laser (SFFL) is demonstrated for the first time to our best knowledge. The control of realized by using a low-pass filtered white Gaussian noise (WGN) signal applied on stretcher in an optical feedback loop. Utilizing WGN signals with different amplitudes An and cutoff frequencies fc, linewidths are availably controlled wide range from 0.8 353 kHz. obtained signal-to-noise ratio (OSNR) more than 72.0 dB, relative intensity...

Multi-gigahertz fundamental repetition rate, tunable rate and wavelength, ultrafast fiber lasers at wavelengths of 1.0, 1.5, 2.0 µm are experimentally demonstrated summarized. At the wavelength 1.0 µm, laser is tuned in range 1040.1-1042.9 nm shifted by 226 kHz a 3-cm-long all-fiber controlling temperature resonator. Compared with previous work where maximum average power was 0.8 mW, this study significantly improved to 57 mW under launched pump 213 thus achieving an optical-to-optical...

This paper presents an ultrathin and tunable ultrawideband plasmonic terahertz absorber using vanadium dioxide (VO₂) phase transition metamaterials,with 5.98 μm thick to addresses current issues of poor frequency tunability narrow bandwidth.

A noise-sidebands-free and ultra-low relative intensity noise (RIN) 1.5 μm single-frequency fiber laser is demonstrated for the first time to our best knowledge. Utilizing a self-injection locking framework booster optical amplifier, sidebands with amplitudes as high 20 dB are completely suppressed. The RIN remarkably reduced by more than 64 dB at relaxation oscillation peak retain below −150 dB/Hz in frequency range from 75 kHz 50 MHz, while quantum limit −152.9 dB/Hz. Furthermore,...

High-power femtosecond (fs)-pulsed all-fiber lasers operating at high repetition rates are highly demanded for various applications, including laser micromachining, nonlinear optical imaging, high-speed sampling, arbitrary waveform generation, and frequency metrology. However, their performance has long been limited by either the average power, rate, pulse width, or compactness, which prevent practical applications. In this work, we report a rate fs-pulsed 2.0 µm that so far provides best...

Abstract Er‐activated fiber lasers are critical for many significant applications, including communication, gas sensing, lidar and military. Although the design of suitable materials has improved performance lasers, extension their operation wavebands still remains a challenge. Here, compact all‐fiber laser is proposed demonstrated, which can support lasing beyond 1630 nm, based on an hybridized glass fiber. The collaborative theoretical analysis experimental characterization indicate that...

States that are switchable from single soliton to pulse bunch in a compact semiconductor saturable absorber mirror (SESAM) mode-locked fiber laser with fundamental repetition rate of 3.2 GHz experimentally investigated and further studied via simulations. A composite filtering effect comprising an intracavity low-finesse Fabry-Perot (FP) filter, artificial optical low-pass gain filter implements the state switching bunch. numerical model is proposed clarify mechanism underlying switching. It...

Heavily Tm3+-doped barium gallo-germanate glass single-mode (SM) fibers were successfully drawn. A gain per unit length of 3.6 dB/cm at 1.95 µm was obtained. To the best our knowledge, this is highest reported for germanate SM fibers. single-frequency fiber laser operating has been built using a 1.5-cm-long active pumped by 1568 nm laser. The direct output power from ultracompact cavity 227 mW. results show that are highly promising high-power and applications.

With increasing demand on a laser source in the gigahertz pulse repetition rate regime, clarification mechanism of instability high fiber lasers - promising alternative to solid state is great importance and can potentially offer guideline for continuous wave (CW) mode locking. Here we present theoretical approach together with relevant experimental corroboration analyze instabilities. By means appropriate approximations, regimes from Q-switched locking, CW locking pulsation are...

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...

Mid-infrared fiber optical parametric oscillators (MIR FOPOs) based on the degenerate four-wave mixing (DFWM) of tellurite photonic crystal fibers (PCFs) are proposed and modeled for first time. Using DFWM coupled-wave equations, numerical simulations performed to analyze effects PCFs, single-resonant cavity, pump source MIR FOPO performances. The results show that: (1) although a longer PCF can decrease threshold FOPOs few watts only, high conversion-efficiency idler usually requires...

An all-fiber high-power and broad-frequency-band near-shot-noise-limited kHz-linewidth (Δν ~1.7 kHz) single-frequency master-oscillator power amplifier (MOPA) laser at 1.5 μm is demonstrated. To significantly suppress the intensity noise of seed mitigate detrimental effects amplified spontaneous emission stimulated Brillouin scattering in fiber amplifiers, more than 23 W a stable low output achieved with relative < -150 dB/Hz @0.5 mW (near to shot-noise limit: -152.9 dB/Hz) frequency band...

A new technique for the realization of a stable Q-switched operation in single-frequency fiber laser based on self-injecting polarization modulation is demonstrated, first time to best our knowledge. piezoelectric stretcher was utilized introduce periodic stress-induced changes. Then state transformed into Q switching by virtue designed distributed Bragg reflector (DBR) resonant cavity with polarizations loss anisotropy. Finally, actively at 1.5 μm Gaussian-shape pulse output achieved. We...

The Earth's magnetic field has significant effects that protect us from cosmic radiation and provide navigation for biological migration. However, slow temporal variations originating in the liquid outer core invariably exist. To understand working mechanism of geomagnetic improve accuracy systems, a high-precision magnetometer is essential to measure absolute field. A helium optically pumping an advanced approach, but its sensitivity are directly limited by low-frequency relative intensity...

Optical resonant cavities of the mode-locked fiber lasers have been intuitively assumed to be on order several or tens meters because nonlinear phase accumulation produced by long optical fibers is essential for pulse-shaping. However, smaller than 10 cm, ultrafast can yield pulse trains with fundamental repetition rates reaching gigahertz, affecting pulse-shaping mechanism. For instance, Yb <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

We report on the pulse instability in GHz repetition-rate thulium-doped fiber laser from numerical perspective, hinging a combined physical model that incorporates rate equations of rare-earth ion energy levels and nonlinear Schrödinger equation. In terms this more explicit model, we predict two pulsating regimes, i.e., gain- soliton-induced pulsations. Further, study also reveals novel type continuous wave mode locking (CWML) regime, which pulse-intensity fluctuates as well notable pedestal...