A5101401446- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Optical Network Technologies
- Photonic and Optical Devices
- Laser-Matter Interactions and Applications
- Solid State Laser Technologies
- Photonic Crystals and Applications
- Metamaterials and Metasurfaces Applications
- Plasmonic and Surface Plasmon Research
- Semiconductor Lasers and Optical Devices
- Advanced Photonic Communication Systems
- Photorefractive and Nonlinear Optics
- Orbital Angular Momentum in Optics
- Porphyrin and Phthalocyanine Chemistry
- Liquid Crystal Research Advancements
- Optical Systems and Laser Technology
- Nonlinear Optical Materials Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Spectroscopy and Laser Applications
- Laser Design and Applications
- Molecular Junctions and Nanostructures
- Supramolecular Self-Assembly in Materials
- Advanced Semiconductor Detectors and Materials
- Photochromic and Fluorescence Chemistry
Yunnan University
2024
China Academy of Engineering Physics
2016-2023
Laser Research Institute
2019-2021
Fusion (United States)
2021
Laser Fusion Research Center
2021
Huazhong University of Science and Technology
2019-2021
Fusion Academy
2021
Chongqing Technology and Business University
2007-2020
Shandong University
1997-2019
State Key Laboratory of Crystal Materials
2014-2019
A high-power monolithic continuous wave (CW) Yb doped fiber amplifier at 1064 nm has been demonstrated based on traditional large mode area step-index fiber, which generated 5.07 kW narrow line-width laser with near diffraction-limited beam quality. At the maximal output power, >35dB OSNR achieved being 370pm, and measured quality is M <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> <sub xmlns:xlink="http://www.w3.org/1999/xlink">x</sub>...
In this paper, we present experimental studies on newly developed multiplexed chirped tilted fiber Bragg gratings (MCTFBGs) for stimulated Raman scattering (SRS) suppression high-power laser systems. The MCTFBG device is composed of five continuous segments (CTFBGs), which are inscribed into the large-mode-area (LMA, 25/400μm) fibers. SRS capability has been successfully demonstrated with a master oscillator power amplification (MOPA) system at output level 3.4 KW. observation thus indicates...
A high-power monolithic continuous-wave fiber amplifier at 1064 nm has been demonstrated based on a piece of confined ytterbium-doped fiber, which generated 3.5 kW narrow-linewidth laser with near-diffraction-limited beam quality. By tailoring the diameter gain dopant across core, and optimizing profile refractive index doping concentration, works making fundamental mode more dominant in transverse competition, while suppressing high-order mode. In kilowatt-level master oscillator power...
A novel C 3 -symmetric triphenylamine discotic liquid crystal with fluorescent gel properties has important applications in detection of PA and Si hybrid solar cells.
We present a continuously tunable thulium(Tm)-doped fiber laser operating in the important 2.1 μm region, which is tandem-pumped by another Tm-doped at 1908 nm. The advantages of pumping long-wavelength absorption tail (>1900 nm) include reduced quantum-defect, and efficient suppression amplified spontaneous noise (and potential parasitic lasing) short-wavelength region. This facilitates attainment stable lasing operation long-wave emission Tm ~2.1 μm. By rotating diffraction grating inside...
ADP crystals were grown, and their optical properties including third harmonic generation measured.
The self-imaging effect in a square core fiber has been investigated, and an integrated all-fiber combiner proposed based on large mode area double clad fiber, which can be employed to construct high power coherent beam combining sources the format. influence of various parameters quality ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="m1"> <mml:mrow> <mml:msup> <mml:mi mathvariant="italic">M</mml:mi> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:math> )...
The spatial-spectral evolution properties of laser beam in the presence stimulated Raman scattering (SRS) effect have been studied large mode area (LMA) fiber. With employment long/short pass filters, spatial signal and light has individually. After onset SRS, simultaneous optimizing degrading was observed, which attributed to SRS multimode beams LMA spectral characteristics indicated that fiber will trigger other nonlinear effects, mainly inter-modal four-wave-mixing cross-phase-modulation...
Monolayers of 5,10,15,20-tetra-4-oxy(acetic acid)phenylporphyrin (TAPP) and its complexes formed with n-octadecylamine (ODA) in molar ratios 1:1, 1:2, 1:3, 1:4, n-hexadecylamine (HDA) (1:4), dimethyldihexadecylammonium bromide (DMDAB) tetrahexadecylammonium (THDAB) (1:4) at the air−Cd2+ solution interface have been studied. The formation was confirmed by UV−vis spectra spreading solutions surface pressure−area (π−A) isotherms monolayers. π−A monolayers transferred show that molecular areas...
High power cladding mode stripper device has been developed in robust configurations, which demonstrated high attenuation and low temperature rise, allowing to remove 2.16 kW of with efficiency being 21.7 dB. The maximum packaging did not exceed 55 °C at a room 20 °C. signal insertion loss was measured be below 0.05 dB, indicating the ability strip light efficiently but keep core almost intact. A 40-min stress test carried out, confirmed working stability reliability proposed stripper....
In this work, mode evolution in the presence of stimulated Raman scattering (SRS) effect has been studied a 2 kW polarization-maintained (PM) fiber amplifier. It proved that SRS-induced distortion can be observed at 40 dB signal to noise ratio PM amplifier, which is significantly lower than non-PM system. By using decomposition (MD) method, analyzed quantitatively by decomposing and light individually, shows dissimilar phenomenon compared with transverse instability. The SRS large area...
The single-molecule Raman detection has been realized for a long time because of the enhancement effect surface plasmons. However, small cross section optical activity (ROA) makes it so hard to detect ROA even few molecules; and normal surface-enhanced (SE-ROA) is also very consumable with strong laser power. Detecting in an economic way important issue. In this paper, we discuss ultimate limit SE-ROA provide factor formula SE-ROA. Following formula, proposed structure both huge enhancement,...
Large-size DKDP crystals are grown by conventional-growth (CG) and rapid-growth (RG) methods their deuterium homogeneities measured in situ Raman spectroscopy. The influence of homogeneity on third harmonic generation (THG) is also researched. results indicate that the CG crystal good content (0.005% cm−1 deviation along e-axis) its can be neglected, while RG shows a more complicated distribution content. Its decreases gradually, about 0.2% per cm with growing, which will lead to 5%...
In this work, quasi-static mode degradation in high power fiber amplifiers has been investigated experimentally. An increase of M 2 from 1.3 to 2.6 with distortion the beam profile is observed, which results signal spectra and backward light characterization departing traditional phenomena. The amplifier operated at same input pump 705 W for nearly 2.2 hours investigate relationship between photodarkening. evolution factor/beam profile, correlation coefficient output laser different working...
Evaluating the laser quality accurately is one of most important and fundamental physical issues for sources, beam lasers from large mode area few-mode fibers have been haunted by presence high order many years. This paper presents a modification to M 2 factor, which can be used evaluate content fiber efficiently, no matter whether modes are superposited coherently or incoherently. By mathematical derivation, origin influence relative phase on factor has determined mathematically. A second...
By employing the mode decomposition method to study relative evolution characteristics during stimulated Raman scattering (SRS) process, a numerical model of core-pumped effect in few-mode fibers has been proposed, which provides an accurate tool reveal underlying physical mechanism SRS-induced distortion. Mode distortion induced by SRS large-mode area passive investigated numerically. It reveals that can result irreversible power transfer from signal fundamental (FM) high order modes...
Five-hundred-watt cylindrical vector beams (CVBs) at 1030 nm with the 3 dB linewidth being less than 0.25 have been generated from a narrow all-fiber linearly polarized laser by metasurface extracavity conversion. At maximum output power, transmission efficiency and polarization extinction ratio of radially (RP-CVBs) are beyond 98% 95%, respectively. The average power is approximately an order higher previously reported high-power narrow-linewidth CVBs fiber lasers. temperature rise 10°C 500...
We successfully prepared a series of optically poled germanosilicate glass. As second harmonic generation (SHG) material, their properties in the frequency-doubling process are systematically demonstrated and summarized, such as polarization dependence, symmetry point group, angle sensitivity, etc. The glass behaves more like uniaxial crystal. Their poling studied well, including time ultra-violet irradiation effects. results prove that second-order nonlinearity can be kept medium. In...
We present difference frequency generators (DFGs) using cascaded PPLN crystals, each with a distinct poling-period, as the parametric gain medium. show that phase-matching bandwidth of crystals is combination individual crystal. In non-phase-matched section there exists periodic backward and forward frequency-conversion processes. Nonetheless, we demonstrate such back-conversion process would not compromise nonlinear crystals. By two poling periods 31 µm 29 µm, experimentally obtained...
We report a kind of structured light beam with periodical polarization and phase singularities. It is generated from setup consisting conical refraction transformation 4f-system. By this setup, the structures are produced without any change intensity distributions. analyze both theoretically experimentally periodically beam. The dependence period demonstrated on length crystal focal length. shown that input can be used to control output