Single-frequency fiber lasers have drawn intense attention for their extensive applications from high-resolution spectroscopy and gravitational wave detection to materials processing due the outstanding properties of low noise, narrow linewidth, resulting long coherence length. In this paper, recent advances single-frequency oscillators amplifiers are briefly reviewed in broad wavelength region 1–3 μm. Performance improvements laser noise linewidth addressed with newly developed physical...

High-power fiber lasers have seen tremendous development in the last decade, with output powers exceeding multiple kilowatts from a single fiber. Ytterbium has been at forefront as primary rare-earth-doped gain medium owing to its inherent material advantages. However, for this reason, are largely confined narrow emission wavelength region of ytterbium. Power scaling other regions lagged significantly, and large number applications rely upon diversity wavelengths. Currently, Raman only known...

Aqueous zinc batteries (AZBs) feature high safety and low cost, but intricate anodic side reactions dendrite growth severely restrict their commercialization. Herein, ethylenediaminetetraacetic acid (EDTA) grafted metal organic framework (MOF-E) is proposed as a dually-functional interphase for sustainable Zn anode. Specifically, the target-distributed EDTA serves an ion-trapped tentacle to accelerate desolvation ionic transport by powerful chemical coordination, while MOFs offer suitable...

Transport measurements are presented on a class of electrostatically defined lateral dots within high mobility two-dimensional electron gas (2DEG). The design allows Coulomb blockade (CB) to be performed single dot containing 0, 1 over 50 electrons. CB enhanced by the spin polarized injection from and into 2DEG magnetic edge states. This combines measurement charge with through spin-blockade spectroscopy. results spectroscopy for first 45 electrons enable us construct addition spectrum...

Visible-stimulated emission in a semiconductor quantum dot (QD) laser structure has been demonstrated. Red-emitting, self-assembled QDs of highly strained InAlAs have grown by molecular beam epitaxy on GaAs substrate. Carriers injected electrically from the doped regions separate confinement heterostructure thermalized efficiently into zero-dimensional QD states, and stimulated at approximately 707 nanometers was observed 77 kelvin with threshold current 175 milliamperes for 60-micrometer...

Ti-doped MgB2 superconductors with different doping levels were prepared by solid-state reaction at ambient pressure. The density, diamagnetic signal, and Jc of the samples change significantly level, best result achieved x=0.1. At 5 K, reaches 2×106 A/cm2 in self-field 5×104 T. 20 is still as high 1.3×106 9.4×104 2 It observed that partial melting occurs samples, resulting an excellent grain connection extremely density. In addition, some fine particles (with sizes from 10 to 100 nm) second...

We report a more than 150 W spectrally-clean continuous wave Raman fiber laser at 1120 nm with an optical efficiency of 85%. A approximately 30 m standard single mode silica is used as gain to avoid second Stokes emission. spectrally asymmetric resonator (in the sense mirror reflection bandwidth) usual Bragg gratings designed minimize power lost into unwanted direction, even when effective reflectivity rear grating becomes low 81.5%.

We demonstrate the cascaded coherent collinear combination of a seed-split triplet 1178nm high-power narrow-band (sub-1.5MHz) SBS-suppressed CW Raman fibre amplifiers via nested free-space constructive quasi-Mach-Zehnder interferometry, after analysing first two in detail. Near-unity and cascaded-combination efficiencies are obtained at all power levels up to maximum P(1178) > 60W. Frequency doubling this cascaded-combined output an external resonant cavity yields P(589) 50W with peak...

We demonstrated a passively mode-locked erbium-doped fiber laser by using gold nanorods as saturable absorber. The (GNRs) were mixed with sodium carboxymethylcellulose (NaCMC) to form GNRs-NaCMC films. By inserting one of the films into an EDFL cavity pumped 980 nm diode, stable mode-locking was achieved threshold pump power ∼54 mW, and 12 ps pulses at 1561 repetition rate 34.7 MHz maximum average ∼2.05 mW obtained for ∼62 mW.

The wavelength tunability of conventional fiber lasers are limited by the bandwidth gain spectrum and feedback mechanism. Here a laser which is continuously tunable from 1 to 1.9 μm reported. It random distributed Raman laser, pumped Yb doped laser. ultra-wide enabled unique property that both stimulated scattering Rayleigh available at any wavelength. dispersion used control spectral purity output.

High power mid-infrared supercontinuum (SC) laser sources are important for a wide range of applications in sensing, spectroscopy, imaging, defense, and security. Despite recent advances on high SC using fluoride fibers, the lack fibers with good chemical thermal stability remains significant technological challenge. Here we show that all solid fluorotellurite developed can be used as nonlinear media constructing 10-W-level sources. All fabricated by rod-in-tube method. The core cladding...

A 170 W all-fiber linearly-polarized single-frequency sing-mode ytterbium amplifier at 1064 nm with an optical efficiency of 80% is demonstrated. 3.9 m long ytterbium-doped polarization maintaining fiber a core diameter 10 μm used as the gain fiber, which guarantees diffraction-limited output measured M(2) 1.02. To suppress stimulated Brillouin scattering, longitudinally varied strains are applied on according to signal power evolution and temperature distribution. 7 times increase...

An up to 8th order cascaded Raman random fiber laser with high spectral purity is achieved the pumping of a narrow linewidth amplified spontaneous emission source. The over 90% for all 8 Stokes orders. highest output power 6.9 W at 1691.6 nm an optical conversion efficiency 21% from 1062.0 nm. As comparison, conventional FBG-based oscillator as pump source, only 47% order. temporal stability proved play key role, because time fluctuation transferred directly outputs and results in...

An ultra-broadband tunable cascaded Raman random fiber laser pumped by a (1020–1080 nm) ytterbium-doped is investigated. By continuously adjusting the pump wavelength, tunes accordingly due to gain competition. increasing power, up 5th order achieved. As result, 300 nm of continuous wavelength tuning from 1070 1370 achieved and power altogether. The highest output 1.8 W at 1360 with an optical efficiency 15% 1080 nm. To best our knowledge, this widest range reported for so far.

Legume cultivars affect N uptake, component crop growth, and soil physical chemical characteristics in maize–legume intercropping systems. However, how belowground interactions mediate root fixation, nodulation of different legumes to uptake is still unclear. Hence, a two-year experiment was conducted with five planting patterns, i.e., maize–soybean strip (IMS), maize–peanut (IMP), corresponding monocultures (monoculture maize (MM), monoculture soybean (MS), peanut (MP)), two application...

Observations are reported of a metal-insulator transition in 2D hole gas asymmetrically doped strained SiGe quantum wells. The metallic phase, which appears at low temperatures these high mobility samples, is characterised by resistivity that decreases exponentially with decreasing temperature. This behaviour, and the duality between conductivity on two sides transition, very similar to recently for Si-MOSFETs.

Three-dimension technologies offer great promise in providing improvements the overall circuit performance. Physical design plays a major role ability to exploit flexibilities offered third dimension, and this article gives an overview of placement routing methods for FPGA- ASIC-style designs. We describe CAD techniques 3D ICs, developed under our analysis optimization framework. These approaches address dichotomy styles, both FPGA ASIC. The factors that are important each style different,...

We report on a 25 W continuous wave narrow linewidth (< 2.3 MHz) 589 nm laser by efficient (> 95%) coherent beam combination of two 1.5 Raman fiber amplifiers with Mach-Zehnder interferometer scheme and frequency doubling in an external resonant cavity efficiency 86%. The results demonstrate the amplifier technology as promising solution for developing sodium guide star adaptive optics.

Abstract Robust high‐power narrow‐linewidth lasers at 589 nm are required for sodium laser guide star adaptive optics in astronomy. A based on Raman fiber amplifier is reported here, which works both continuous‐wave and pulsed formats. In the case, produces more than 50 W output. same square‐shaped pulses with tunable repetition rate (500 Hz to 10 kHz) duration (1 ms 30 μs). The peak power as high 84 remains constant during tuning. also emits an adjustable sideband 1.71 GHz away from main...

An up to 44 W, 1 MHz linewidth, 1178 nm CW laser is obtained by Raman amplification of a distributed feedback diode in variably strained polarization-maintaining fiber with record-high optical efficiency 52%, pumped linearly polarized 1120 laser. A polarization extinction ratio 30 dB achieved due the all-polarization-maintaining configuration and dependence gain. The strain distribution designed according signal power evolution along fiber. 20 times reduction effective stimulated Brillouin...

A kilowatt-level Raman fiber laser is demonstrated with an integrated Ytterbium-Raman amplifier architecture. high power Ytterbium-doped master oscillator at 1080 nm seeded a 1120 the same time. By this way, pump and signal combined in core. The subsequent conversion from to accomplished 70 m long passive fiber. 1.28 kW all-fiber optical efficiency of 70% demonstrated, limited only by available power. To best our knowledge, first report over one kilowatt output.

Gold nanorods (GNRs) were used as a saturable absorber (SA) for passive mode-locking at 1 μm wavelength. The GNR-SA film was fabricated by mixing GNRs with sodium carboxymethylcellulose. longitudinal surface plasmon resonance absorption of to induce mode-locking. By using the film, stable 1039 nm experimentally demonstrated in an ytterbium-doped fiber laser cavity pumped 980 diode. produced ~440 ps pulses repetition rate 36.6 MHz and average output power ~1.25 mW pump ~82 mW.

Laser guide stars based on the mesospheric sodium layer are becoming increasingly important for applications that require correction of atmospheric scintillation effects. Despite several laser approaches being investigated to date, there remains great interest in developing lasers with necessary power and spectral characteristics needed brighter single or multiple stars. Here we propose demonstrate a novel, best our knowledge, approach diamond Raman intracavity Type I second-harmonic...