- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Thermal resonance effect by a strong shock wave in D–T fuel side-on ignition by laser-driven block acceleration
摘要： Ignition with the help of a shock wave is performed by the interaction of accelerated plasma block by a petawatt-picosecond (PW-ps) laser, with a solid-state density fuel that it is a new possibility for achieving controlled fusion by inertial confinement. The unexpected production of plasma blocks provides new access to the ignition of solid-state density fuel according to the Chu hydrodynamic model. When the produced plasma block by the PW-ps laser hits the main fuel due to the density differences between the plasma block and the main fuel of the shock wave, this progressive wave increases the density of solidified fuels and reduces the energy of the ignition threshold and increases the flammability. In this study, a new discovery of shock waves has been observed leading to the resonance phenomenon. Nuclear heat shock waves resonance in the side-on ignition of fuel in the internal layer of fuel at x ≠ 0 appears from the exact solution of the hydrodynamic equations with respect to the density profile. This important finding achieves the required ignition temperature for solid-state fuel deuterium–tritium (D–T) in certain energies, with a significant increase due to the resonance of thermonuclear waves. This discovery will facilitate practical experiments on the ignition of advanced solid-state fuels with the accelerated plasma blocks by a PW-ps laser at certain energies.
关键词： plasma blocks,thermonuclear reaction,laser,resonance,solid-state fuel,shock waves,Bremsstrahlung,ignition
更新于2025-09-12 10:27:22
-
[IEEE 2019 Photonics North (PN) - Quebec City, QC, Canada (2019.5.21-2019.5.23)] 2019 Photonics North (PN) - Diode-Pumped Dual-Wavelength Nd:GVO4 Laser
摘要： We report on the continuous-wave dual-wavelength laser operation of a Nd:GdVO4 laser using a single birefringent filter (BRF) plate. The laser operated at wavelength pair of 1063 & 1071 nm under in-band diode pumping of 912 nm. maximum total output power was ~ 2.5 W at ~13.4 W of absorbed pump power. Further rotation of the BRF could be used to adjust the power ratio between the two wavelengths or to achieve single wavelength operation [10,17].
关键词： diode-pumped,neodymium,solid-state laser
更新于2025-09-12 10:27:22
-
Acousto-optic mode-locked Tm:LuAG laser with nearly diffraction-limited beam
摘要： We reported an acousto-optic mode-locked Tm:LuAG laser pumped by a 786? nm laser diode and realized continuous-wave mode-locked operation. At the pump power of 8.2?W, the output average power was 335 mW with the wavelength of 2023.2?nm. The pulse width was 240?ps at the pulse repetition frequency of 81.60?MHz, and the beam quality factor M2 was 1.04. The output wavelength was tuned from 2022.6 to 2025.3?nm, corresponding to the output average power of 310 to 353 mW. In addition, the self-mode-locking phenomenon was found.
关键词： Solid-state lasers,Actively mode-locked,Thulium laser,Infrared laser
更新于2025-09-12 10:27:22
-
Highly compact nanosecond laser for space debris tracking
摘要： This study demonstrated the use of a highly compact nanosecond laser system operating at 532 nm and producing a maximum output power of 70 W with a pulse width of 5 ns at 0.5 kHz, for space debris tracking. To improve the ranging accuracy while minimizing the influence of the pulse noise, a bidirectional Q-switch was adopted in the oscillator to generate a short pulse width with less tailing. The laser was applied for low-Earth-orbit space debris tracking, and space debris with the farthest distance of 1701.9 km at the minimum radar cross-section of 1 m2 could be detected with a ranging precision of up to 26.90 cm.
关键词： Solid-state laser,Space debris tracking,Bidirectional Q-switch,Nanosecond
更新于2025-09-12 10:27:22
-
Voltage-gated optics and plasmonics enabled by solid-state proton pumping
摘要： Devices with locally-addressable and dynamically tunable optical properties underpin emerging technologies such as high-resolution reflective displays and dynamic holography. The optical properties of metals such as Y and Mg can be reversibly switched by hydrogen loading, and hydrogen-switched mirrors and plasmonic devices have been realized, but challenges remain to achieve electrical, localized and reversible control. Here we report a nanoscale solid-state proton switch that allows for electrical control of optical properties through electrochemical hydrogen gating. We demonstrate the generality and versatility of this approach by realizing tunability of a range of device characteristics including transmittance, interference color, and plasmonic resonance. We further discover and exploit a giant modulation of the effective refractive index of the gate dielectric. The simple gate structure permits device thickness down to ~20 nanometers, which can enable device scaling into the deep subwavelength regime, and has potential applications in addressable plasmonic devices and reconfigurable metamaterials.
关键词： optical properties,solid-state proton pumping,refractive index modulation,hydrogen loading,electrochemical hydrogen gating,voltage-gated optics,plasmonics
更新于2025-09-12 10:27:22
-
Efficient continuous-wave Nd:YLF laser in-band diode-pumped at 908?nm and its thermal lensing
摘要： We report on what we believe is the first continuous-wave yttrium lithium fluoride laser with in-band diode pumping at 908 nm. Pumping at this wavelength reduced the quantum defect by more than 50% when compared to the conventional pumping at ~800 nm. The laser produced an output power of 850 mW at 1047 nm and its radiation was π-polarized. It had a near diffraction limited output beam and a maximum slope efficiency of ~73.9% with respect to the absorbed pump power. The thermal lensing strength was experimentally measured and compared with the previous experimental data. It was found that the thermal lensing was significantly reduced when compared to the traditional ~800 nm pumping.
关键词： neodymium,diode-pumped lasers,solid-state laser
更新于2025-09-12 10:27:22
-
A study nanocrystalline TiO 2 based on dye sensitized solar cells with quasi solid state electrolytes
摘要： A quasi solid state electrolytes can be done by adding potassium iodide (KI) and iodine (I2) into quasi solid state electrolytes. Consisting 1,2,4,5–tetrakisbromomethyl benzene (TB), ? –butyrolactone (GBL), propylene carbonate (PC), and ethylene carbonate (EC) gelated with sample 1, 2, 3 and 4. Potassium iodide salt poorly soluble in liquid electrolyte, but can dissolve completely in quasi solid state electrolytes. The dye sensitized solar cell (DSSCs) with the quasi solid state electrolytes were fabricated. The results showed that the energy conversion efficiency of light to electricity were 0.052 %, 0.126 %, 0.121 % and 0.125 %., respectively, under irradiation of 80 mW/cm2. The performance of the dye sensitized solar cell with quasi solid state electrolytes is more stable than that of liquid electrolytes.
关键词： TiO2,dye sensitized solar cell,potassium iodide,iodide salts,quasi solid state electrolytes,energy conversion efficiency
更新于2025-09-12 10:27:22
-
Effect of ionic liquid concentration on the photovoltaic performance of dye-sensitized solar cell
摘要： Quasi-solid-state electrolytes based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVdf-HFP), propylene carbonate (PC), 1,2-dimethoxyethane (DME) and different concentrations of 1-methyl-3-propylimidazolium iodide (MPII) salt were prepared. The highest room temperature conductivity of 4.6 x 10-3 S cm-1 was achieved with 1.0M MPII. The effect of MPII on the conductivity was discussed on the basis of number free ions. The number of free ions were estimated by impedance spectroscopy method. DSSC at 1.0M MPII shows the conversion efficiency, η of 3.70% with short-circuit current density, Jsc of 8.65 mA cm-2, open circuit voltage, Voc of 641 mV and a fill factor, FF of 66%.
关键词： MPII,Electrolyte,Quasi-solid state,PVdF-HFP,Dye-sensitized solar cells
更新于2025-09-12 10:27:22
-
[IEEE 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Baltimore, MD, USA (2019.9.29-2019.10.3)] 2019 IEEE Energy Conversion Congress and Exposition (ECCE) - Implementation of Flexible Large Power Transformers Using Modular Solid State Transformer Topologies Enabled by SiC Devices
摘要： Large power transformers (LPTs) have been a major concern of the electric power sector as a failure of a single unit can lead to temporary service interruption and utility damages. Replacement of such large and heavy transformer units is a challenging job as LPTs are custom-designed and hence entail long lead times due to its intricate manufacturing process and transportation. On the other hand, solid-state-transformer (SST) technology has evolved as an alternate option for the conventional line-frequency transformers, which offers comparatively reduced size and weight with the enhanced power quality features. With the advancement in wide-bandgap devices such as silicon carbide (SiC) and advanced power electronic converters, SSTs are able to deploy in medium voltage applications. Consequently, the utilization of SiC-SSTs for large power applications can mitigate some of the existing concerns of LPTs. In this paper, challenges and concerns associated with the existing LPTs are discussed. Possible SST modules/cells enabled by SiC devices, which can be connected in a modular structure to achieve multi-cell flexible large power SSTs (FLP-SST) are presented. The effectiveness of the discussed SST cells is validated using appropriate simulations and experimental results of the scaled SST prototypes.
关键词： solid-state transformers (SSTs),modular converters,Large power transformers,SiC Devices
更新于2025-09-12 10:27:22
-
Biodegradable blends of graphene quantum dots and thermoplastic starch with solid-state photoluminescent and conductive properties
摘要： Polymer composites based on blends of graphene quantum dots (GQDs) with thermoplastic starch (TPS) were prepared by melt-extrusion combined with hot pressing. The GQDs/TPS films were characterized as potential novel, high-performance, and ecofriendly composites replacing traditional non-biodegradable plastic packaging materials. GQDs stock solutions of different concentrations were incorporated into TPS matrices in order to analyze the solid-state fluorescent properties and conductive properties of GQDs/TPS films. The fluorescent, conductive, morphological, mechanical, and optical properties of the GQDs/TPS films were characterized by ultraviolet–visible spectroscopy, surface resistance measurement, scanning electron microscopy, Fourier-transform infrared (FT-IR) spectroscopy, tensile testing, and X-ray diffraction (XRD). FT-IR studies indicated hydrogen bonding between the oxygen-containing groups on GQDs surfaces and the –OH groups in the TPS. The mechanical testing results showed the optimum GQDs loading of 10.9 wt% in the blend. XRD and TEM studies indicated uniform graphene dispersions in the TPS matrix for ≤10.9 wt% GQDs loading; further increases in loading caused agglomeration. The maximum photoluminescence intensity and conductivity of the materials were obtained at 10.9 wt% GQDs loading. These materials have potential applicability in flexible optoelectronic packaging materials.
关键词： Solid-state photoluminescence,Film,Thermoplastic starch,Graphene quantum dots,Conductive property
更新于2025-09-12 10:27:22