Photopolymer 3D printing techniques have a common limitation: the layers to be deposited in sequential order, which constrains multi-material fabrication where vats exchanged many times, addition repeating cleaning step for each vat change. In this work, we present technique that allows stereolithography by overcoming layer-by-layer limitation, enabling one single immersion per resin. This is enabled selective crosslinking of voxels at any depth and position inside (SLA) resin vat. The...

An all-fiber LD-clad-pumped Tm-doped fiber laser was reported, and the CW maximal output power reached 24 W at nearly 1.94 μm. The double-clad had a demission of 25/250 μm with core NA 0.1 inner-clad 0.46. A matched passive multi-mode FBG acted as front cavity. Cooling by water, 56% high slope efficiency achieved threshold 6.4 W, respected to launched pump power. At low pump, spectrum only one peak 1.936 Increasing power, wavelength grew 3–4 peaks. Because reflectivity not very high, both...

The extraction of building information is great significance for environmental change detection and urban development, also conducive to the country's macro-control scientific management. Based on four Landsat8 OLI image data Huangdao District, Qingdao City in 2015, 2017, 2019 2021, this study proposes a method combing random forest feature selection with SVM algorithm. In method, first, 22 variables are extracted from images. Second, used screen out important features. Finally, selected...

Continuous wave (CW) operation of a c-cut Tm (5 at %), Ho (0.3 %):YAP laser 2132 nm wavelength were reported in this paper. In the temperature 77 K, Tm,Ho:YAP crystal was double end-pumped by 21.4 W fiber-coupled diode (LD) center 794.3 nm. Different resonator lengths and output couplers for total pump power tried. The length 205 mm, maximum CW 6.17 acquired, corresponding to an optical-optical conversion efficiency 28.8% slope 35.6%.

A widely tunable narrow linewidth compact erbium-doped all-fiber ring laser with 104 nm tuning range was reported. An Fabry-Perot filter (FFP-TF) used to realize the output, and wavelength at constant voltage had high time stability. With 8 m length fiber as gain medium, we realized from 1513 1617 less than 40 pm any wavelength. Pumped by 976 diode, worked slope efficiency of above 10% threshold 21 mW.

We report for the first time to inscribe Fiber Bragg Grating (FBG) in Tm3+-doped multimode double-clad silica fiber by 800 nm femtosecond laser with a phase mask. The 1.35 μm period grating is written into core, which responded center wavelength located at nearly 1960 nm. Continuous wave total output power of 11.5 W obtained under launched pump 29.8 W, corresponding slope efficiency 45.0% and conversion 38.6%.

We report on the room-temperature continuous-wave (CW) operation of a Ho:YAlO3 laser that is resonantly end pumped at 1.94 μm by diode-pumped thulium-doped in same host. Through use 1 % Ho3+-doped 20-mm-long YAlO3 crystal (b cut), generated W linearly polarized (E//c) output 2118 nm and 0.55 E//a 2128.5 for an incident pump power 5 W, with coupler transmission 14 3%, respectively. An optical-to-optical conversion efficiency 20% slope 33% were achieved corresponding to power.

The thermal focal length of a Tm,Ho:GdVO4 crystal was measured in this paper. pump laser 25.73 W, and the 692.6 mm; based on crystal, single end-pump continuous wave (CW) operation designed to demonstrate effect length, 0.26-W output power high considering than unconsidering with 26.1-W power.

We present for the first time a highly efficient Ho:YAP laser at 2117.9 nm, which is double-end inband pumped by two all-fiber Tm-doped fiber lasers 1936 and 1948 nm. Using single 50 mm long rod in simple L-shaped resonator geometry, maximum output power of 10.1 W slope efficiency 43.6% with respect to incident pump are acquired. The crystals work under room temperature 24°C, without any active thermal management. This experimental results verify can be versatile sources 1.9 μm regions.

The top-hat beam clad-pumped Tm3+-doped fiber laser was realized simply using an intracavity multi-mode abrupt taper. ratio of the flat-top diameter to spot reaches 53%, with a small intensity variation less than 6%, and beam's half-divergence angle is only 5.3°. has maximal output power 5 W slope efficiency 39.7%, pumped by 792 nm diode (LD). taper directly made on double-clad near end 0.45 waist clad diameter, this 4% Fresnel reflection used be coupler. laser's high reflective coupler...

Efficiencies improvement of LD (laser diode) pumped multimode large mode area (LMA) Tm3+ doped double cladding silica fiber lasers with different in-line biconial tapers were reported. Two types used in this experiment. Each type was made into three lasers, a uniform geometry laser and two tapered taper parameters. Biconical located several centimeters from the output end by heating stretching method. Although threshold best added 200 mW, slope efficiency (25.3%) maximum power (1.31 W)...

A high efficient LD (laser diode) pumped Tm3+ doped double clad silica fiber laser with an intravacity biconical taper was reported. located ∼3 cm from the output end of fabricated by heating and stretching method a length 1.5 waist diameter ∼20 µm. The slope efficiency 49.8% respected to launched pump power, maximum power 1.97 W. Pre post ratio ∼10. This compared other three tapered lasers (the same different tapers) uniform geometry laser. With intracavity tapers, lasers’ thresholds were...

A high stability all-fiber LD-clad-pumped Tm3+-doped fiber laser was reported. The had the ultra-narrow linewidth 50 pm at 1.948 μm with maximal output power of 12.8 W. slope efficiency 28.9%, and threshold 5.7 double-clad core multi-mode, which a demission 25/250 NA 0.1 inner-clad 0.46. reflectivity coupler FBG directly written into single-mode passive photosensitive optical core, diameter 15 0.1. cavity build-up by end Fresnel reflectivity.

The intracore fiber Bragg gratings (FBGs) were successfully written into the non-photosensitive multi-mode Tm-doped core by 800 nm fs laser and a phase mask. Using varied focal length lens, tunable writing was realized, wavelength band over 84 nm. A geometrical optics imaging model numerical calculation described to explain mechanism. interference modulation intensity characteristics also theoretically investigated considering beam incident angle variation. Based on FBGs, all-fiber had...

A novel ensemble neural network structure is presented for automatic classification of power quality disturbances. Power (PQ) disturbances analysis the focus control. The characteristics PQ include short duration, variety types and so on. foundation control automation. Different Neural network, such as BP networks, RBF networks probabilistic etc, already applied in area recognition. researches about recognition are mainly focused on optimizing signal type network. But accuracy rate still...

A long uniform taper fabricated on a large mode area Tm3+-doped double-clad fiber laser, which was clad-pumped by laser diode (LD), found to be an effective wavelength filter while improving the output beam quality and narrowing line-width significantly. The directly multi-mode heating stretching method, located several centimeters before end. By slightly bending section, spectrum left with only one peak less than 0.5 nm, compared multi-peak 5 nm tapering, indicating that could produce...

We report on a diode-pumped Tm, Ho:YAlO3 (c-cut) laser operating at 274 K. The maximum output power reaches 163 mW an absorbed pump of 2.3 W. A conversion efficiency from the to 7.1% is demonstrated in Ho:YAlO3, corresponding slope 11.1%. center wavelength 2102 nm with about 2-nm FWHM. As far as we know, our work represents first investigation performance c-cut

In this article, we introduced a recurrent neural network (RNN) serves as cheating detection method in CS: GO against traditional and AI methods. Cheating methods today are growingly stronger, making anti-cheating less helpful. The CV AimBot, which does not include any illegal operation but only reading the game footage, has made all de facto useless. We developed AimBot from scratch used it to generate sample data. gathered datasets newly invented run through an RNN. Our RNN shows high...

A widely tunable compact erbium-doped all fiber ring laser with 104nm turning range was reported. Fabry-Perot filter (FFP-TF) used to be the tuning element realize from 1513nm 1617nm linewidth less than 40 pm at any wavelength. The worked slope efficiency of above 10% and threshold 21mW. This can wavelength interrogation a relatively high speed resolution.