A5025099782- Terahertz technology and applications
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Solid State Laser Technologies
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Photorefractive and Nonlinear Optics
- Superconducting and THz Device Technology
- Advanced Fiber Laser Technologies
- Nuclear physics research studies
- Semiconductor Lasers and Optical Devices
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Advanced Fiber Optic Sensors
- Semiconductor Quantum Structures and Devices
- Photocathodes and Microchannel Plates
- Magnetic confinement fusion research
- Electron and X-Ray Spectroscopy Techniques
- Photonic Crystals and Applications
Chinese Research Academy of Environmental Sciences
2024
Northwest University
2024
South China University of Technology
2024
Huaqiao University
2024
Tianjin University
2014-2023
Changchun University of Science and Technology
2005-2021
Thomas Jefferson National Accelerator Facility
2003-2015
Academy of Opto-Electronics
2014
Newport (United States)
2007
Changchun Institute of Optics, Fine Mechanics and Physics
2004-2006
Separated longitudinal and transverse structure functions for the reaction 1H(e,e(')pi(+))n were measured in momentum transfer region Q2 = 0.6--1.6 (GeV/c)(2) at a value of invariant mass W 1.95 GeV. New values pion charge form factor extracted from cross section by using recently developed Regge model. The results indicate that this is larger than previously assumed consistent with monopole parametrization fitted to very low elastic data.
The charged pion form factor, ${F}_{\ensuremath{\pi}}({Q}^{2})$, is an important quantity that can be used to advance our knowledge of hadronic structure. However, the extraction ${F}_{\ensuremath{\pi}}$ from data requires a model ${}^{1}\mathrm{H}(e,{e}^{'}{\ensuremath{\pi}}^{+})n$ reaction and thus inherently dependent. Therefore, detailed description factor electroproduction obtained recently at Jefferson Lab presented, with particular focus given dominant uncertainties in this procedure....
The data analysis for the reaction H(e,e' pi^+)n, which was used to determine values charged pion form factor Fpi of Q^2=0.6-1.6 GeV^2, has been repeated with careful inspection all steps and special attention systematic uncertainties. Also method extract from measured longitudinal cross section critically reconsidered. Final separated transverse sections extracted are presented.
Cross sections for the reaction ${}^{1}\mathrm{H}(e,{e}^{'}{\ensuremath{\pi}}^{+})n$ were measured in Hall C at Thomas Jefferson National Accelerator Facility (JLab) using high-intensity Continuous Electron Beam (CEBAF) to determine charged pion form factor. Data taken central four-momentum transfers ranging from ${Q}^{2}=0.60$ 2.45 ${\mathrm{GeV}}^{2}$ an invariant mass of virtual photon-nucleon system $W=1.95$ and 2.22 GeV. The cross separated into four structure functions...
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and scattered electron novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of neutron-rich hypernucleus, He 7 Lambda, observed for the first time (e,e'K+) reaction an energy resolution ~0.6 MeV. This is best reported to date hypernuclear spectroscopy. he Lambda binding supplies last missing information A=7, T=1 iso-triplet, providing new input charge symmetry breaking (CSB) effect...
In this letter, a temperature sensor based on fiber ring laser with reflective Sagnac loop is proposed. The inserted into the through download optical used as filter and sensing head to supply high sensitivity. As varies, transmission spectrum of changes, leading shift emission wavelength laser. We obtain system sensitivity 1.739 nm/°C, narrow 3-dB bandwidth less than 0.05 nm, signal-to-noise ratio ~50 dB. Moreover, it convenient achieve remote by changing length fiber.
The imaging diagnosis and prognostication of different degrees traumatic brain injury (TBI) is very important for early care clinical treatment. Especially, the exact recognition mild TBI bottleneck current label-free technologies in neurosurgery. Here, we report an automatic evaluation method with terahertz (THz) continuous-wave (CW) transmission based on machine learning (ML). We propose a new feature extraction biological THz images combined transmittance distribution features spatial...
We have demonstrated a high-average-power, high-repetition-rate optical terahertz (THz) source based on difference frequency generation (DFG) in the GaSe crystal by using near-degenerate 2 μm intracavity KTP parametric oscillator as pump source. The power of dual-wavelength laser was up to 12.33 W with continuous tuning ranges 1988.0–2196.2 nm/2278.4–2065.6 nm for two waves. Different cystal lengths been experimentally investigated DFG THz order optimize output power, which good agreement...
The first measurements of the differential cross section for d(gamma,p)n reaction up to 4.0 GeV were performed at Continuous Electron Beam Accelerator Facility (CEBAF) Jefferson Lab. We report sections proton center-of-mass angles 36, 52, 69 and 89 degrees. These results are in reasonable agreement with previous lower energy. degree data show constituent-counting-rule behavior photon 36 52 disagree counting rule behavior. quantum chromodynamics (QCD) model nuclear reactions involving reduced...
A humidity sensor based on Fabry-Perot interferometer (FPI) and intracavity sensing of a fiber ring laser is proposed experimentally demonstrated. compact humidity-sensitive fiber-optic FPI developed inserted in laser. Because the output power modulated by reflection loss at different ambient humidity, induced. The experiment shows that relative has good linear response to from 25%RH 95%RH sensitivity 0.202 dB/%RH obtained with narrow 3-dB bandwidth high signal-to-noise ratio. Furthermore,...
We report an experimental study on widely tunable terahertz (THz) wave difference frequency generation (DFG) with hydrogen-bonded crystals 2-(3-(4-hydroxystyryl)-5,5-dime-thylcyclohex-2-enylidene) malononitrile (OH1). The organic were pumped by a ∼1.3 μm double-pass KTiOPO4 optical parametric oscillator. A tuning range of 0.02–20 THz was achieved. OH1 offer long effective interaction length (also high output) for the below 3 THz, owing to low absorption and favorable phase-matching. highest...
532 nm green laser is utilized to achieve terahertz tuning range expanding in KTiOPO4 parametric oscillator. With the theoretical analysis of stimulated polariton scattering, an expanded tunability oscillator can be realized. A wide output from 5.7 6.1 THz, 7.4 7.8 11.5 11.8 and 13.3 13.5 THz was demonstrated our experiment, result well matched analysis. The maximum energy 1.61 μJ under pump 140 mJ, corresponding wave conversion efficiency 1.3 × 10−5, threshold about 30 mJ.
A high-energy, tunable, long-wave mid-infrared optical parametric oscillator (OPO) based on the BaGa4Se7 crystal was demonstrated in this Letter with 1064 nm laser pumping. The OPO designed as a double-pass single resonant (DP-SRO) to reduce threshold and improve outputs. Further optimization cavity length theoretically experimentally studied. With short of 30 mm, output energy over 1 mJ/pulse at 11 µm obtained pump 39.5 mJ/pulse. In addition, wide tuning range 8-14 achieved by rotating crystal.
We report measurements of cross sections for the reaction 1H(e,e′K+)Y, both Λ and Σ0 hyperon states, at an invariant mass W=1.84GeV four-momentum transfers 0.5<Q2<2(GeV/c)2. Data were taken three values virtual photon polarization ε, allowing decomposition into longitudinal transverse components. The data are a revised analysis prior work, whereas results have not been previously reported.Received 5 November 2002DOI:https://doi.org/10.1103/PhysRevC.67.055205©2003 American Physical Society
A high-energy and tunable mid-infrared source based on BaGa4Se7 crystal was demonstrated by single-pass difference-frequency generation (DFG). Orthogonally polarized wave at 1064 nm (λ1) idler (λ2) generated KTP-OPO, which could be tuned in the wavelength range of 1360-1600 nm, were used as DFG dual-wavelength pump. The pump parameters including total energy ratio studied. Maximum pulse 5.72 mJ 3.58 μm obtained 58.4 mJ/pulse. tuning 3.36-4.27 with a flat tunability. Moreover, saturation...
A pioneering experiment in \ensuremath{\Lambda} hypernuclear spectroscopy, undertaken at the Thomas Jefferson National Accelerator Facility (JLab), was recently reported. The used high precision, continuous electron beam JLab, and a special arrangement of spectrometer magnets to measure spectrum from C $^{7}\mathrm{Li}$ targets using $(e,e'{K}^{+})$ reaction. ${}_{\ensuremath{\Lambda}}^{12}$B found this investigation previously published, but is reported here more detail, with improved...
Terahertz (THz) imaging technology is a developing and promising candidate for biological diagnosis, security inspection, semiconductor wafer examination, due to the low photon energy, high transparency, fingerprint properties of THz radiation. However, major encountered bottleneck degradation image quality caused by power fluctuation source, interference phenomenon, complex environment, so on. In this paper, we present mathematical morphology improve quality, taking advantage morphological...
In this paper, a novel dual-parameter measurement scheme using long-period grating (LPG) concatenated with polarization maintaining fiber (PMF) in Sagnac loop was proposed and experimentally demonstrated to measure temperature refractive index (RI) simultaneously. There are two types of dips the output spectrum sensor, which formed by LPG loop. Compared traditional sensors PMF only, birefringence induced changes phase difference makes sensitive surrounding RI. Due different interference...
Inclusive electron scattering data are presented for 2H, C, Fe, and Au targets at an incident energy of 4.045 GeV a range momentum transfers from Q2=1 to 7(GeV/c)2. Data were taken Jefferson Laboratory low values loss, corresponding Bjorken x≳1. The structure functions do not show scaling in x this range, where inelastic is expected dominate the cross section. scaling, however, Nachtmann variable ξ. This appears be result Bloom- Gilman duality nucleon function combined with Fermi motion...
We have extracted QCD matrix elements from our data on doubly polarized inelastic scattering of electrons nuclei.We find the higher twist element d2, which arises strictly quarkgluon interactions, to be unambiguously non zero.The also reveal an isospin dependence effects if we assume that Burkhardt-Cottingham Sum rule is valid.The fundamental Bjorken sum obtained a0 satisfied at low momentum transfer.