A5039591702- Advanced Fiber Laser Technologies
- Laser-Matter Interactions and Applications
- Photonic Crystal and Fiber Optics
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Solid State Laser Technologies
- Gyrotron and Vacuum Electronics Research
- Optical Coherence Tomography Applications
- Laser Design and Applications
- Quantum optics and atomic interactions
- Cold Atom Physics and Bose-Einstein Condensates
- Terahertz technology and applications
- Orbital Angular Momentum in Optics
- Laser-Plasma Interactions and Diagnostics
- Optical Network Technologies
- Photonic and Optical Devices
- Optical Systems and Laser Technology
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Advanced X-ray and CT Imaging
- Advanced Frequency and Time Standards
- Microwave Imaging and Scattering Analysis
- Advanced Fiber Optic Sensors
- Medical Imaging and Analysis
- Advanced X-ray Imaging Techniques
Lawrence Berkeley National Laboratory
2002-2024
Nanjing University of Science and Technology
2023-2024
Taiyuan University of Technology
2024
National Time Service Center
2024
Chinese Academy of Sciences
2024
China Academy of Engineering Physics
2017-2023
Jilin Normal University
2017-2022
Southwest University
2008-2022
Tianjin University
2014-2021
Research Institute of Highway
2020
Significance Afferent and efferent nerve fibers cannot be distinguished based on the axonal diameter or presence of Remark bundle. The compaction myelin sheath involves 2 steps: 1) distance between layers cell membranes in double-bilayer decreases; 2) adjacent double-bilayers close to form MDL. expression MBP is positively correlated with formation Anchoring by lipophilin particles might required for a compacted sheath. abnormalities fiber structure observed autologous grafts do not appear...
A reservoir computing (RC) system based on a semiconductor laser (SL) with double optical feedback and injection is proposed, the prediction performance of such numerically investigated via Santa Fe Time-Series Prediction task. The simulation results indicate that RC can yield good performance. Through optimizing some relevant operating parameters, ultra-fast information processing rates up to Gb/s level be realized for error below 3%.
Multiple-input multiple-output (MIMO) radars and synthetic aperture radar (SAR) techniques are well researched have been effectively combined for many imaging applications ranging from remote sensing to security. Despite numerous studies that apply MIMO concepts SAR imaging, the design process of a MIMO-SAR system is non-trivial, especially millimeter-wave (mmWave) systems. Many issues be carefully addressed. Besides, compared with conventional monostatic sampling schemes or MIMO-only...
We develop a rapidly converging algorithm for stabilizing large channel-count diffractive optical coherent beam combination. An 81-beam combiner is controlled by novel, machine-learning based, iterative method to correct the phases, operating on an experimentally calibrated numerical model. A neural-network trained detect phase errors based interference pattern recognition of uncombined beams adjacent combined one. Due non-uniqueness solutions in full space possible network within limited...
Abstract Background Plants have remarkable diversity in petal colour through the biosynthesis and accumulation of various pigments. To better understand mechanisms regulating pigmentation Lonicera japonica , we used multiple approaches to investigate changes carotenoids, anthocyanins, endogenous hormones gene expression dynamics during transitions, i.e., green bud petals (GB_Pe), white flower (WF_Pe) yellow (YF_Pe). Results Metabolome analysis showed that YF_Pe contained a much higher...
We experimentally investigate the quantum-correlated twin beams generated through stimulated nondegenerate four-wave mixing in double-lambda atomic system. A 2.5-dB noise reduction of intensity difference with 18.4-GHz frequency at cesium ${D}_{1}$ line is observed a Cs vapor cell. The quantitative theoretical analysis reveals experimental difficulty getting high quantum correlation atoms because large hyperfine splitting ground states. However, it favorable for obtaining wide range pump...
Removal of residual linear energy chirp and intrinsic nonlinear curvature in the relativistic electron beam from radiofrequency accelerator is paramount importance for efficient lasing a high-gain free-electron laser. Recently, it was theoretically experimentally demonstrated that longitudinal wakefield excited by electrons itself corrugated structure allows precise control phase space. In this Letter, we report first utilization as linearizer operation seeded laser driven 140 MeV...
We have generated 81 independently controllable beams using a spatial light modulator and combined them on diffractive combiner, to characterize the combiner develop fast phase error detection scheme. A key parameter of is measured in new way, enabling an efficient combination when programming calibrated phases each beam. This testbed provides platform for development advanced feedback control high channel-count beam combination.
An 8-beam, diffractive coherent beam combiner is phase controlled by a learning algorithm trained while optical phases drift, using differential mapping technique. Combined output power stable to 0.4% with 95% of theoretical maximum efficiency, limited the element.
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
We demonstrate ultra-broadband spectral combining of ultrashort pulses from Yb-doped fiber amplifiers, with coherently spectrally synthesized pulse shaping, to achieve tens-of-fs pulses. This method can fully compensate for gain narrowing and high order dispersion over broad bandwidth. produce 42fs by synthesizing three chirped-pulse amplifiers two programmable shapers across an 80nm overall To the best our knowledge, this is shortest duration achieved a combined system at one-micron...
Helical filamentation of optical fields has gained significant attention due to its potential physical properties, complexity, and practicality. However, conventional methods manipulating filament formation face a major challenge in achieving controllable helical filamentation. We propose method manipulate collapse based on nonlinearity-related Gouy phase shift. This is triggered by the nonlinear interaction between vector vortex beams anisotropic Kerr media. It uncovered that, absence...
Multigas sensing is highly demanded in the fields of environmental monitoring, industrial production, and coal mine security. Three near-infrared emission wavelengths from PbSe quantum dots (QDs) were used to analyze concentration three gases simultaneously through direct absorption spectroscopy, including acetylene (C2H2), methane (CH4), ammonia (NH3). The corresponding lower detection limits for 20, 100, 20 ppm, respectively, with an accuracy 2%. This study demonstrates that QDs tunable...
Field emission from a solid metal surface has been continuously studied for century over macroscopic to atomic scales. It is general knowledge that, other than the properties, emitted current governed solely by applied electric field. A pin cathode used study dependence of field on stored energy in an L-band rf gun. The was changed adjusting axial position (distance between base and gun back surface) while tip kept constant. very strong correlation field-emission with observed. While...
Filamentation, as a universal femtosecond phenomenon that could occur in various nonlinear systems, has aroused extensive interest, owing to its underlying physics, complexity and applicability. It is always anticipated realize the controllable designable filamentation. For this aim, crucial problem how actively break symmetry of light-matter interaction. A kind extensively used approaches based on spatial structure optical fields involving phase, amplitude polarization. Here we present an...
Ultra-wideband (UWB) radar technology is a key in the field of target recognition, which characterized by high resolution and strong anti-interference ability. In this paper, ultra-wide bandwidth equipment used to identify multistatus human being after brick wall fuzzy pattern recognition genetic algorithm. First, The main characteristic parameters are selected extracted from received signal, each feature corresponding submembership function. Then, through algorithm optimize function for...
Ultra-wideband (UWB) radar with strong anti-jamming performance and high-range resolution can be used to separate multiple human targets in a complex environment. In recent years, through-wall being detection UWB has become relatively sophisticated. this paper, the method of kernel principal component analysis (KPCA) feature extraction support vector machine (SVM) classification algorithm are applied identify classify statuses detection. This makes full use KPCA powerful, nonlinear SVMs,...
We present a novel circumferential-scan endoscopic optical coherence tomography (OCT) probe by using circular array of six electrothermal microelectromechanical (MEMS) mirrors and C-lenses. The MEMS have 0.5 mm × mirror plate chip size 1.5 1.3 mm. Each can scan up to 45° at voltage less than 12 V. Six those been successfully packaged head; full circumferential scans demonstrated. Furthermore, each unit is composed C-lens the units be designed with different focal lengths adapt for lesions...
A high-power CW Yb:YAG slab laser amplifier with no adaptive optics correction has been experimentally established. At room temperature, the emits a power of 22 kW an average beam quality (β) less than 3 in 0.5 min. To our knowledge, this is brightest without closed-loop demonstrated to date. In addition, extracted 17 optical extraction efficiency 33%, corresponding residual path difference µm, achieved single gain module. The module potential be scalable higher powers while maintaining good...
Abstract Our primary objective is to mitigate the adverse effects of temperature fluctuations on optical frequency transmission system by reducing length interferometer. Following optimization, phase-temperature coefficient reduced approximately 1.35 fs/K. By applying a sophisticated control remained “out-of-loop” optics fiber, noise floor has been effectively lowered 10 −21 level. Based this performance-enhanced transfer system, we demonstrate coherent through 500-km spooled fiber link....