A5090446183- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Advanced Fiber Laser Technologies
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Solid State Laser Technologies
- Silicon and Solar Cell Technologies
- Spectroscopy and Laser Applications
- Semiconductor Lasers and Optical Devices
- Mechanical and Optical Resonators
- solar cell performance optimization
- Orbital Angular Momentum in Optics
- Quantum Mechanics and Applications
- Thin-Film Transistor Technologies
- Laser Design and Applications
- Advanced MRI Techniques and Applications
- Quantum, superfluid, helium dynamics
- Semiconductor materials and interfaces
- Silicon Nanostructures and Photoluminescence
- Laser-Matter Interactions and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Photovoltaic System Optimization Techniques
Shanxi University
2016-2025
Jilin Medical University
2024-2025
North Sichuan Medical University
2024
State Key Laboratory of Quantum Optics and Quantum Optics Devices
2015-2024
Anhui Medical University
2024
Shanxi University of Traditional Chinese Medicine
2003-2022
The University of Texas at Austin
2020-2021
Walker (United States)
2020-2021
The University of Texas MD Anderson Cancer Center
2017-2020
Innovation Team (China)
2019
The radiative recombination coefficient B(T) of intrinsic crystalline silicon is determined as a function temperature over the range 77–300 K. We observe that decreases and we compare our results to previously published contradictory data from literature. calculated absorption for band-to-band transitions, which determine at different temperatures photoluminescence spectra measured on planar high resistivity float zone wafers. Photoluminescence could be detected large more than five orders...
We have observed a Bose-Einstein condensate in dilute gas of 4He the (3)2S(1) metastable state. find critical temperature (4.7+/-0.5) microK and typical number atoms at threshold 8 x 10(6). The maximum our is about 5 10(5). An approximate value for scattering length = (16+/-8) nm measured. mean elastic collision rate then estimated to be 2 10(4) s(-1), indicating that we are deeply hydrodynamic regime. decay time s, which places an upper bound on constants two-body three-body inelastic collisions.
A silicon solar cell structure, PERC (passivated emitter and rear cell), has very recently demonstrated energy conversion efficiency above 23%. number of interesting features the design are discussed. Rear contact is based on a balance between beneficial effects small sparsely spaced points upon open circuit voltage short-circuit current corresponding negative fill factor. The noncontacted regions surface held in weak depletion by an optically isolated but electrically connected Al...
We study stability of a Schrödinger equation with collocated boundary feedback compensator in the form heat input/output pair. Remarkably, exponential is achieved for both positive and negative gains, namely, as long gain non-zero. show that spectrum closed-loop system consists only two branches along parabolas which are asymptotically symmetric relative to line <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex...
Although it has been close to 60 years since the first operational silicon solar cell was demonstrated, last 15 have seen large improvements in technology, with best confirmed efficiency improved by over 50 %. The main drivers electrical and optical design of cells. Improvements former area include passivation contact surface regions cells a reduction volume heavily doped material within cell. Optically, reduced reflection trapping light had impact. Such features increased recently value...
Improvements in the performance of silicon photovoltaic cells for solar applications are adapted nonsolar applications. Improved monochromatic light efficiencies above 45% reported including close to 40% relatively long-wavelength (1.064 mu m) as produced by neodymium-doped yttrium-aluminum garnet (Nd:YAG) lasers.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
Although many calculations since the early 1980s have predicted that high performance in thin crystalline silicon cells is feasible, levels demonstrated past been quite modest. Using a self-supporting membrane, experimen tal energy conversion efficiency above 20% described for first time cell of less than 50 μm thickness, with up to 21.5% independently confirmed 47-μm thick device. The demonstrate better ability tra p light internally within their structure any previously measured They also...
The performance of silicon solar cells has been significantly improved using an PERL (passivated emitter, rear locally diffused) cell structure. This structure overcomes deficiencies in earlier PERC emitter and cell) by diffusing boron into contact areas at the cells. Terrestrial energy conversion efficiencies up to 24% are reported for first time. Air Mass 0 approach 21%. batches concentrator this have demonstrated significant improvement, with 29% efficient expected near future.< <ETX...
High-efficiency large-area PERL (passivated emitter, rear locally diffused) cells have been produced at the University of New South Wales in a sufficient quantity to supply three cars for 1996 World Solar Challenge (WSC) solar car race. Almost 20 000 were fabricated, with designated illumination area efficiency ranging up 24%. A flat-plate module made from 50 such fabricated early production process and having an average just over 23% has demonstrated record 22.7%. The energy conversion...
Single point diamond turning (SPDT) is highly controllable and versatile in producing axially symmetric forms, non-axially-symmetric microstructured surfaces, free forms. However, the fine SPDT marks left surface limit its performance, they are difficult to reduce or eliminate. It unpractical for traditional methods remove without destroying their especially aspheres This paper introduces abrasive jet polishing (AJP) posttreatment of diamond-turned surfaces periodic microstructures. Samples...
Abstract Electromagnetically induced transparency (EIT) and two‐color polarization spectroscopy (TCPS) with Rydberg atoms are spectroscopic techniques developed based on the interaction between a ladder‐type three‐level atomic system two light fields. The narrow linewidth high contrast EIT TCPS have important applications in laser frequency stabilization, antennas, radar microwave electric fields detection. Here, cesium investigated using level driven by 509‐nm coupling beam 852‐nm probe...
With the help of Stokes operator S2 squeezed state (also called polarization (PSS)) 795-nm light, rubidium-87 (87Rb) atomic magnetometer based on Faraday rotation has been implemented and characterized.The PSS light prepared by means coherently combining coherent (PCS) a linearly p-polarized bright beam s-polarized vacuum (SVS) generated 397.5-nm ultraviolet laser pumped sub-threshold optical parametric oscillator (OPO) with PPKTP bulk crystal inside OPO cavity.PSS squeezing level -3.7...
BACKGROUND: Approximately half of the patients with acute ischemic stroke who receive intravenous thrombolysis (IVT) do not achieve an excellent outcome. Remote conditioning (RIC) as a promising neuroprotective treatment may improve clinical outcomes in this population. This study aimed to assess efficacy and safety RIC IVT. METHODS: multicenter, participant-blinded, blinded end point, randomized controlled trial included 558 underwent IVT 18 hospitals from August 2021 May 2023. After IVT,...
Spin alignment based Rb-87 magnetometry with free spin precession has been proposed. A 795-nm linearly polarized laser beam, serving as the pump beam and probe propagates through a cylindrical enriched atomic vapor cell along Z axis, polarization orientation aligned Y axis. Simultaneously, static magnetic field B0⃗ is applied π/2 pulse radio-frequency (RF) BRF⃗ Given that direction aligns field, exhibits π polarization. This induces symmetric population distribution of ground-state atoms...
The Autler–Townes (AT) doublet, a fundamental manifestation of quantum interference effects, serves as critical tool for studying the dynamic behavior Rydberg atoms. Here, we investigate asymmetry doublet in trap-loss fluorescence spectroscopy (TLFS) cesium (Cs) atoms confined magneto-optical trap (MOT) with single-step excitation using 319-nm ultraviolet (UV) laser. A V-type three-level system involving ground state 6S1/2 (F = 4), excited 6P3/2 (F′ 5), and (nP3/2 (mJ +3/2)) is theoretically...
Based on the cesium $6{S}_{1/2}$-$6{P}_{3/2}$-$8{S}_{1/2}$ ladder-type atomic system, double-resonance optical pumping (DROP) spectra including electromagnetically induced transparency (EIT) effects have been investigated with a room-temperature vapor cell. For both cases of probe and coupling laser beams passing through cell counter-propagation (CTP) co-propagation (CP) configurations, DROP measured in experiment display explicitly different linewidths. Thanks to EIT effect, linewidth...
We present an investigation of electromagnetically induced transparency (EIT) without Doppler background due to a locked probe laser. The EIT is theoretically studied based on multilevel ladder-type cesium atomic system 6${S}_{1/2}$--6${P}_{3/2}$--8${S}_{1/2}$ in room-temperature vapor cell. experimental results agree with the theoretical calculations. Compared traditional spectra profile limiting spectral resolution for keeping coupling laser and scanning laser, these scanned have flat...
Abstract Most investigations on heat exchanger network (HEN) synthesis which plays an important role in improving the efficiency of industrial plants, focus deterministic conditions whereas operational flexibility and feasibility are less concerned. In real world, each system experiences various disturbances due to changes stream temperature, flow rate, other uncertain factors. An approach for flexible HEN under severe operation uncertainty is proposed, represented by Probability bounds...
We report on efficient generation of second harmonic laser and single-mode vacuum squeezed light 795 nm with periodically poled KTiOPO4 (PPKTP) crystals. achieved 111 mW ultra-violet (UV) at 397.5 from 191 fundamental a PPKTP crystal in doubling cavity, corresponding to conversion efficiency 58.1%. Using the UV pump an optical parametric oscillator crystal, we realized -5.6 dB maximum squeezing. analyzed power dependence squeezing level concluded that induced losses limit improvement level....
With the help of light-emitting diodes at center wavelength 470 nm, we demonstrate that light-induced atom desorption (LIAD) can be used for flexibly controlling loading magneto-optical traps (MOT) cesium atoms. Under an ultralow background pressure in a quartz cell without any wall coating, show low intensity blue light to control rates (from 200 4000 atoms/s) and number atoms (on order ${10}^{4}$ our experiment) MOT use dispensers or secondary source. A theoretical model based on rate...
The hyperfine structure (hfs) splittings of the $4{D}_{5/2}$ state for two isotopes $^{87}\mathrm{Rb}$ and $^{85}\mathrm{Rb}$ atoms are measured based on double-resonance optical pumping spectra in a $5{S}_{1/2}\text{\ensuremath{-}}5{P}_{3/2}\text{\ensuremath{-}}4{D}_{5/2}$ ladder-type atomic system. frequency calibration is performed by employing wideband fiber-pigtailed phase-type electro-optic modulator together with Fabry-P\'erot cavity to cancel error arising from nonlinear scanning....