A5109109061- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Luminescence Properties of Advanced Materials
- Photorefractive and Nonlinear Optics
- Laser Design and Applications
- Laser-Matter Interactions and Applications
- Glass properties and applications
- Photonic Crystal and Fiber Optics
- Ferroelectric and Piezoelectric Materials
- Optical properties and cooling technologies in crystalline materials
- Solid-state spectroscopy and crystallography
- Acoustic Wave Resonator Technologies
- Phytochemicals and Antioxidant Activities
- Microwave Dielectric Ceramics Synthesis
- Thermography and Photoacoustic Techniques
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Diamond and Carbon-based Materials Research
- Optical Network Technologies
- Chalcogenide Semiconductor Thin Films
- Natural product bioactivities and synthesis
- Astrophysical Phenomena and Observations
- Curcumin's Biomedical Applications
- Nutritional Studies and Diet
- Biochemical and biochemical processes
Chengdu University of Traditional Chinese Medicine
2024-2025
Guangzhou Vocational College of Science and Technology
2023
Science & Technology Park (Czechia)
2023
Shandong University
2007-2016
State Key Laboratory of Crystal Materials
2002-2016
Macquarie University
1998
City University of Hong Kong
1998
We experimentally demonstrated a passively mode-locked femtosecond laser by using graphene-based saturable absorber mirror (graphene SAM) in the spectral region of 2 μm. The graphene SAM was fabricated transferring chemical-vapor-deposited, high-quality, and large-area on highly reflective plane mirror. Stable pulses as short 729 fs were obtained with repetition rate 98.7 MHz an average output power 60.2 mW at 2018 nm.
With MoS2 as saturable absorber, passive Q-switching and Q-switched mode-locking operations of a Tm-doped calcium lithium niobium gallium garnet (Tm:CLNGG) laser were experimentally demonstrated. The emitted maximum average output power 62 mW highest pulse energy 0.72 μJ. mode locking was also obtained in the experiment. research results will open up applications at mid-infrared wavelength.
We have experimentally demonstrated a dual-wavelength synchronously mode-locked Nd:CNGG laser based on the semiconductor saturable absorber mirror technique. Mode locking was achieved simultaneously two gain bands of crystal that central wavelength separation 2.4 nm. The fundamental pulse train has repetition rate 88 MHz and duration 5 ps, with an average output power approximately 90 mW. Autocorrelation measurements show each pulses consists quasi-periodic beat 660 fs width 0.63 THz rate.
We report on a diode-pumped passively mode-locked subpicosecond Nd:CLNGG disordered crystal laser for the first time to our knowledge. Owing large inhomogeneous broadening and spectrum splitting of crystal, generated 900 fs pulses with repetition rate approximately 88 MHz at 1061 nm wavelength. With single-emitter diode pumping, maximum average output power 486 mW was achieved slope efficiency 26%. Our experimental results show that four-level could be an excellent alternative pulse generation.
Barium tungstate (BaWO4) is employed to achieve efficient stimulated Raman scattering conversion in a compact diode-pumped actively Q-switched Nd:YAG laser. With an incident pump power of 9.2 W, 1.56 W 1181 nm first-Stokes average output was generated at pulse repetition rate 20 kHz, corresponding optical-to-optical efficiency 16.9%.
Nd:YVO4 crystal has been grown by Czochralski method. The data of thermal expansion and specific heat have measured. coefficients along a- c-axis are a1 = 2.2 x 10-6 /K, a3 8.4 /K respectively. is 24.6 cal/mol K at 330 K. large anisotropy c- a-axis explained the structure YVO4 crystal. 921 mW output laser 1.06 mikrom obtained with a 3 mm 1mm sample when pumped 1840 cw diode, slope efficiency 55.5%.
Large Ca0.28Ba0.72Nb2O6 (CBN-28) single crystals exhibit saturated ferroelectric hysteresis loops under an electric field of 115kV∕cm along the [001] direction. Their spontaneous polarization, remanent polarization and coercive are 35.3μC∕cm2, 32.2μC∕cm2, 38.1kV∕cm, respectively. The dielectric constant loss tanδ 195 0.32 at 10 kHz, A diffused anomaly with relaxor characteristic was observed in range 325-500 °C low frequencies, while CBN-28 experienced a first-order normal-relaxor phase...
A large single crystal of barium tungstate (BaWO4) with dimensions 22-mmdiameter×80-mm length was grown by the Czochralski method using an iridium crucible. The melting point, molar enthalpy fusion, and entropy fusion were determined to be 1775.10 K, 96913.80Jmol−1, 54.60JK−1mol−1, respectively. average linear thermal-expansion coefficients are αa=10.9526×10−6∕K, αb=10.8069×10−6∕K, αc=35.1063×10−6∕K in temperature range from 303.15 1423.15 K along three respective crystallographic axes....
Abstract Objectives As an aromatic aldehyde, Cinnamaldehyde (CAL) is the representative bioactive component of cinnamon, possessing extensive applications in fields pharmaceuticals, chemicals, food, and feed. The objective present study to elucidate state trends CAL research via bibliometric visualized analysis. Methods Research on was obtained from Web Science Core Collection, knowledge graphs were created employing CiteSpace software. Bibliometric analysis conducted 6205 articles published...
Yb-doped yttrium orthovanadate YbxY1−xVO4 (YYV), with x=0.02, crystallizes a zircon-type structure in the tetragonal system, conforming to space group I41/amd. The lattice constants are a=0.7122(5) and c=0.6291(3) nm at room temperature. primitive cell contains four formula units. Raman spectra crystallography show no distortion of VO4 Y/YbO8 groups. crystal field is similar that YVO4 suitable for dopant Yb3+ ions. A strong absorption 975 arises from F27/2 F25/2 transition; bandwidth 70 it...
In this paper, we report the growth of laser crystal Nd:GdVO4 by Czochralski method, and discuss morphology crystal. The polarization absorption emission spectra were measured. lifetime at 1064 nm is 100μs. An output power up to 1 W has been achieved with a 3 mm × sample when pumped 1.9 cw diode.
A strontium tungstate (SrWO4) single crystal with dimensions of Φ 25×40mm2 has been grown by the Czochralski method using an iridium crucible. X-ray powder diffraction results show that as SrWO4 belongs to tetragonal system in scheelite structure. The effective segregation coefficients elemental W and Sr growth are measured x-ray fluorescence, respective values close 1. thermal properties were systemically studied measuring expansion, specific heat, diffusion coefficient. These possesses a...
A large Er 3+ –Yb co-doped yttrium calcium oxoborate [Er :Yb :Ca 4 YO(BO 3 ) , abbreviated as Er:Yb:YCOB] single crystal, with dimensions of 2.5 cm in diameter and 9.0 length, has been grown along the crystallographic b axis by Czochralski method. X-ray powder diffraction results show that as-grown Er:Yb:YCOB crystal belongs to monoclinic system space group Cm ; unit-cell constants are a = 8.085, 16.048, c 3.528 Å β 101.11°. The high crystalline quality was confirmed high-resolution...
We explore the operation of spontaneous mode locking in a diode-pumped Nd:SrGdGa3O7 disordered crystal laser. The first- and second-order autocorrelations are simultaneously performed to evaluate temporal characteristics. An 80 GHz pulse train with duration as short 616 fs is observed. maximum output power 415 mW at pump 6.1 W.
Nd-doped yttrium orthovanadate (Nd:YVO4, abbreviated as NYV) crystal has been grown using a modified Czochralski method. Its main structural parameters and optical laser properties are all presented. The absorption spectrum of Nd3+ ions doped in NYV wavelength range from 190 to 900 nm that free HCl solution 0.2 mol the 190–900 have both measured. width band around 808 match diode pumping is about 28 nm, which approximately three times broader than aluminum garnet crystal. line intensity...
Thermal conductivity of single-crystal materials is crucial in the fields lasers and nonlinear optics. Understanding physical mechanism thermal such systems therefore great importance. In present work, first principles calculations were employed to study infrared optical materials, CdSiP2 AgGaS2. These compounds crystallize similar structures but with an order-of-magnitude difference conductivity. The average Grüneisen parameters are −0.8 −2.6 for AgGaS2, respectively; these values...
An efficient diode-pumped Yb:NaY(WO(4))(2) (Yb:NYW) disordered crystal laser has been experimentally demonstrated for the fist time. The Yb:NYW a peak absorption cross section of 1.09 x 10(-20) cm(2) at 972 nm and emission 1.24 1010 nm. Under an absorbed pump power 11.7 W, generated average output as high 4.1 with slope efficiency 45%. It was found that always operated in self-pulsing mode, spectrum showed random jumps mechanism also investigated.
Thermal properties of a lowly Nd(3+)-doped disordered Nd:CNGG crystal have been symmetrically investigated. At room temperature, the specific heat, thermal diffusion coefficient and density were determined to be 0.595 J/g.K, 1.223 mm(2)/s 4.718 g/cm(3), corresponding conductivity 3.43 W/m.K. By measuring lens at different pump power, thermal-optical was calculated 9.2x10(-6) K(-1) for first time our knowledge. All recovered that this material can used in moderate even high power.