A5050820023- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Mass Spectrometry Techniques and Applications
- Laser-induced spectroscopy and plasma
- Laser Design and Applications
- Solid State Laser Technologies
- Photonic Crystal and Fiber Optics
- Laser Material Processing Techniques
- Welding Techniques and Residual Stresses
- Photorefractive and Nonlinear Optics
- Spectroscopy Techniques in Biomedical and Chemical Research
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Advanced X-ray Imaging Techniques
- Advanced Fiber Optic Sensors
- Ion-surface interactions and analysis
- Advanced Optical Sensing Technologies
- Advanced Chemical Physics Studies
- Advanced materials and composites
- Electrodeposition and Electroless Coatings
- Atomic and Molecular Physics
- Interdisciplinary Research and Collaboration
- Adrenal and Paraganglionic Tumors
- University-Industry-Government Innovation Models
Chinese Academy of Sciences
2008-2024
Songshan Lake Materials Laboratory
2021-2024
Institute of Physics
2005-2024
Qilu University of Technology
2020-2023
Shandong Academy of Sciences
2020-2023
Henan University of Engineering
2023
University of Central Florida
2012-2022
University of Chinese Academy of Sciences
2019-2021
Czech Academy of Sciences, Institute of Physics
2017-2021
Shandong Jianzhu University
2016
A single isolated attosecond pulse of 67 as was composed from an extreme UV supercontinuum covering 55-130 eV generated by the double optical gating technique. Phase mismatch used to exclude single-atom cutoff spectrum that possesses unfavorable attochirp, allowing positive attochirp remaining be compensated negative dispersion a zirconium foil. Two algorithms, PROOF and FROG-CRAB, were employed retrieve experimental spectrogram, yielding nearly identical results.
Abstract The motion of electrons in the microcosm occurs on a time scale set by atomic unit time—24 attoseconds. Attosecond pulses at photon energies corresponding to fundamental absorption edges matter, which lie soft X-ray regime above 200 eV, permit probing electronic excitation, chemical state, and structure. Here we demonstrate pulse duration 53 as single streaking reaching carbon K-absorption edge (284 eV) utilizing intense two-cycle driving near 1.8-μm center wavelength. Such studies...
Supercontinuum generation in a solid-state medium was investigated experimentally. A continuum covering 460 to 950 nm obtained when 0.8 mJ/30 fs Ti:sapphire laser pulses were applied seven thin fused silica plates at 1 kHz repetition rate. The primary processes responsible for spectral broadening self-phase modulation (SPM) and self-steepening, while SPM self-focusing balanced optimize the suppress multiphoton process. output compressed 5.4 0.68 mJ pulse, corresponding two optical cycles...
We produce a 3 mJ, two-cycle (11.4 fs), 1 kHz, carrier-envelope phase (CEP)-stable laser source at 1.7 μm via three-stage Ti:sapphire-pumped optical parametric chirped-pulse amplifier in BiB3O6. achieve pump-to-signal conversion efficiency of 18% the last stage, which is, to best our knowledge, highest yet achieved for near-octave bandwidth amplification. A f-to-2f measurement shows CEP instability 165 mrad over h. This is an ideal light generating isolated attosecond pulses soft x-ray region.
As a compact and burgeoning alternative to synchrotron radiation free-electron lasers, high harmonic generation (HHG) has proven its superiority in static time-resolved extreme ultraviolet spectroscopy for the past two decades recently gained many interests successes generating soft x-ray emissions covering biologically important water window spectral region. Unlike sources, which suffer from relatively long pulse width or large time jitter, sources HHG could offer attosecond resolution be...
We demonstrate a noncollinear optical parametric chirped-pulse amplification scheme for generating high-peak-power tunable mid-infrared (IR) pulses. The high-gain LiNbO(3)-based amplifier, seeded by femtosecond provides wide wavelength tuning range from 3.3 to 3.95 μm and large saturated gain of over 4000 in single-stage amplifier. compressed mid-IR pulse has energy 13.3 mJ duration 111 fs, with peak power as high 120 GW. To the best our knowledge, this is highest ever reported 3-5 lasers.
High-order harmonic generation (HHG) has a broad spectrum covering vacuum ultraviolet to extreme (XUV) bands, which is useful for applications involving material analyses at different information depths. Such an HHG light source perfect time- and angle-resolved photoemission spectroscopy. Here, we demonstrate high-photon flux driven by two-color field. Applying fused silica compression stage reduce the driving pulse width, obtained high XUV photon of 2 × 1012 phs/s @21.6 eV on target. We...
Time-resolved and angle-resolved photoemission spectroscopy (trARPES) is a powerful method to detect the non-equilibrium electronic structure in solid systems. In this study, we report trARPES apparatus with tunable photon energy selectively among 12, 16.8, 21.6 eV at repetition rate of 400 kHz. The temporal resolutions three harmonics are determined as 104/111/157 meV 276/190/154 fs, respectively. flux on sample estimated be 1010–1011 photons/s by using photodiode. Finally, performance...
We report a laser system that delivers 15 fs pulses with 200 mJ energy at 10 Hz repetition rate. The broadband spectrum extending from 700 nm to 900 was obtained by seeding two-stage Ti:sapphire chirped-pulse power amplifier sub-mJ white-light gas-filled hollow-core fiber. With this laser, an extreme ultraviolet (XUV) super-continuum supporting 230 as isolated attosecond 35 eV generated using the generalized double optical gating technique. XUV pulse ∼100 nJ exit of argon gas target.
Separating the infrared driving laser from extreme ultraviolet (XUV) pulses after high-order harmonic generation has been a long-standing difficulty. In this Letter, we propose and demonstrate that can be blocked by simply installing microchannel plate (MCP) into beam line. addition to its high damage threshold, MCP filter also transmits photons over entire XUV region. This paves way for attosecond pulse with unprecedented bandwidth.
We investigate the use of energetic electron beams for high-resolution radiography flaws embedded in thick solid objects. A bright, monoenergetic beam (with energy $>100\text{ }\text{ }\mathrm{MeV}$) was generated by process laser-wakefield acceleration through interaction 50-TW, 30-fs laser pulses with a supersonic helium jet. The high energy, low divergence, and small source size these make them ideal radiographic studies cracks or voids dense materials that are placed at large distance...
Isolated attosecond pulses (IAPs) are generated via applying amplitude gating on high-order harmonic generation driven by carrier-envelope phase stabilized 5.2 fs with 0.5 mJ pulse energy at 770 nm central wavelength the Synergetic Extreme Condition User Facility. A continuum ranging from 70 to 100 eV that supports sub-100-attosecond is extracted Zr foil and Mo/Si multilayer mirror. We demonstrate characterization of IAP. The retrieved duration 86 attoseconds. developed laser beamline...
A deconvolution technique to eliminate the azimuthal contribution from two-dimensional (2D) images of three-dimensional momentum trajectories is presented. The technique, which in some respects superior Abel and similar numerical inversion methods, exploits simulation generate a 2D polar representation dynamics where radius center image proportional magnitude angle ejection relative polarization axis laser. sample for three-body Coulomb explosion NO2 shown.
We demonstrate efficient generation of continuous spectrum centered at 400 nm from solid thin plates. By frequency doubling 0.8 mJ, 30 fs Ti:sapphire laser pulses with a BBO crystal, 0.2 33 are generated. Focusing the 400-nm into 7 fused silica plates, we obtain 0.15 mJ covering 350–450 nm. After compressing by 3 pairs chirped mirrors, 0.12 8.6 achieved. To best our knowledge, this is first time that sub-10-fs generated which shows spectral broadening in solid-state materials works not only...
Coulomb explosion imaging has been used to explore anisotropies in the fragment angular distribution associated with symmetric six-electron channel of $\mathrm{C}{\mathrm{O}}_{2}$ and $\mathrm{N}{\mathrm{O}}_{2}$ induced by $100\phantom{\rule{0.3em}{0ex}}\mathrm{fs}$, ${10}^{15}\phantom{\rule{0.3em}{0ex}}\mathrm{W}∕{\mathrm{cm}}^{2}$ radiation at $800\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ leading doubly charged atomic ions. Specific precursor molecular geometries (bond angles prior...
Ultrabroadband generation of white-light continuum spanning from ultraviolet to near-infrared (375–920 nm) is demonstrated by using induced-phase modulation between two-color femtosecond pulses in multiple thin plates. The fundamental wave and its second-harmonic one Ti:sapphire chirped-pulse amplifier are injected into nine 100 μm-thick fused silica When the two temporally spatially optimized plates, an intense supercontinuum efficiently achieved utilizing self-phase self-steepening...
Annular-shaped femtosecond few-cycle pulses are generated by 40fs laser propagating through 6 solid thin plates in numerical simulations as well experiments. The generation of such takes advantage the conical emission caused plasma effect, which introduces continuously varying off-axis density along radial direction beam. negative dispersion induced causes pulse at particular location to be self-compressed and form an annular beam short pulse, can extracted simply spatial filtering....
We present an f-to-2f interferometry method to simultaneously measure and control the relative timing (RT) carrier-envelope phase (CEP) of arbitrarily tailored optical-field waveform. Long-term stabilization phase-locking system results in a CEP stability 280 mrad RT 110 attosecond over 8 h at repetition rate 1 kHz. The synthesized optical field characterized by transient-grating frequency-resolved gating delivers 3.8-fs near single-cycle waveforms. This technique constitutes versatile tool...
Supercontinuum generation has been widely applied in laser spectroscopy and few-cycle pulse generation. It is composed of complex unmeasurable nonlinear optical effects, which influence the final broadened spectrum markedly. To describe characterize two key processes, Kerr effect ionization, we employ integrals, including common B integral for a P ionization or plasma effect. With these contributions effects supercontinuum are identified determined quantitatively. Then utilize machine...