A5072581044- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Diamond and Carbon-based Materials Research
- Solid State Laser Technologies
- Electrospun Nanofibers in Biomedical Applications
- Silk-based biomaterials and applications
- Advanced Fiber Optic Sensors
- Magneto-Optical Properties and Applications
- Atomic and Subatomic Physics Research
- Quantum optics and atomic interactions
- Polymer Surface Interaction Studies
- Terahertz technology and applications
- Advanced MRI Techniques and Applications
- Random lasers and scattering media
- Photopolymerization techniques and applications
- High-pressure geophysics and materials
- Photonic and Optical Devices
- Concrete and Cement Materials Research
- Photorefractive and Nonlinear Optics
- Fiber-reinforced polymer composites
- Semiconductor Lasers and Optical Devices
- Innovative concrete reinforcement materials
- Optical Coherence Tomography Applications
- Advanced Frequency and Time Standards
Beihang University
2023
Hefei University
2023
RMIT University
2018-2021
East China Normal University
2012-2016
Next generation wound care technology capable of diagnosing parameters, promoting healthy cell growth, and reducing pathogenic infections noninvasively would provide patients with an improved standard accelerated repair. Temperature is one the indicating biomarkers specific to chronic wounds. This work reports a hybrid, multifunctional optical material platform—nanodiamond (ND)–silk membranes as biopolymer dressings temperature sensing healing. The hybrid structure was fabricated through...
We report on a high-power third-order dispersion managed amplification system that delivers 33-fs pulses of 93.5 W at repetition rate 55 MHz. A pair grisms are used as the pre-chirper for optimizing third order (TOD) to group velocity (GVD) ratio. Detail experiments show use grsim significantly enhances quality compressed pulses. demonstrate both amplifier and compressor can be compensated by grisms. Furthermore, nonlinear phase shift introduced spectral asymmetry during restrained. This...
Diamond containing the nitrogen-vacancy (NV) center is emerging as a significant sensing platform. However, most NV sensors require microscopes to collect fluorescence signals and therefore are limited laboratory settings. By embedding micron-scale diamond particles at an annular interface within cross section of silicate glass fiber, we demonstrate robust fiber material capable magnetic fields. Luminescence spectroscopy electron spin resonance characterization reveal that optical properties...
Ceramsite concrete has gained prominence in sustainable construction and sponge city development owing to its lightweight nature thermal insulation properties. However, inherent brittleness low tensile strength have restricted broader applications. Emerging research highlights fiber reinforcement as an effective enhancement strategy. This study innovatively integrates waste sugarcane bagasse fibers into mortar formulations, conducting comprehensive mechanical tests across varying ratios....
We report on a simple scheme to precisely control carrier-envelope phase of nonlinear-polarization-rotation mode-locked self-started Yb-fiber laser system with an average output power ∼7 W and pulse width 130 fs. The offset frequency was locked the repetition rate ∼64.5 MHz relative linewidth ∼1.4 by using self-referenced feed-forward based acousto-optic shifter. noise timing jitter were calculated be 370 mrad 120 as, respectively.
Abstract Ceramic YAG/Yb:YAG/YAG planar waveguide lasers were realized on continuous-wave and mode-locked operations. The straight waveguide, fabricated by non-aqueous tape casting solid state reactive sintering, enabled highly efficient diode-pumped laser with the slope efficiency of 66% average output power more than 3 W. influence structure wavelength tunability was also experimentally investiccgated a dispersive prism. Passively operation ceramic achieved using semiconductor saturable...
Abstract Using spin‐exchange relaxation‐free (SERF) atomic magnetometer array (AMA) in magnetocardiography and magnetoencephalography has presented a challenge reducing its packing volume for integrated instrumentation convenient maintenance. This study presents novel, space‐saving SERF AMA based on an 8‐channel planar lightwave circuit (PLC) waveguide splitter with compact footprint of 26 × 2.5 mm 2 . The PLC splitting configuration allows the synchronization pump multisensor array,...
We report on the continuous-wave and tunable laser operation of a transparent Yb:YAG ceramic which is prepared by non-aqueous tape casting method with vacuum sintering at 1750 °C for 10 h. The dense excellent optical in-line transmittance characteristics. In lasing experiment, end-pumped high-brightness 974 nm diode pump in fiber core 50 μm numerical aperture 0.22, results maximum output power 7.01 W slope efficiency 60.2% 1050 nm. A smooth curve from 1022 to 1058 achieved testing, revealing...
We demonstrated a diode-pumped-passively mode-locked laser based on specially designed composite YAG/Yb:YAG ceramic. Theoretical studies reveal that this medium was beneficial for reducing the thermal effect. obtained 1.35-ps pulses with maximum output power of 475 mW an semiconductor saturable absorber mirror at room temperature 22 °C. A 240 W further generated using master oscillator amplifier system ceramic as seeding oscillator.
We present a method for stabilizing the repetition rate of an erbium-doped all-fiber laser by inserting electronic polarization controller (EPC) in fiber cavity. The device exhibited good integration, low cost, and convenient operation. Such stabilization may facilitate comb system with high integration. was phase-locked to Rb reference more than 72 h feedback voltage applied one channel EPC. 74.6 MHz. standard deviation linewidth were 1.4 1.7 mHz, respectively.
We experimentally explored the influence of passive harmonic mode locking on temporal and spectral features a ytterbium-doped fiber laser. Similar dependences free-running linewidth laser carrier-envelope offset frequency (f0) intracavity net dispersion were observed for fundamental-, second-, third-order mode-locking states. Due to reduction nonlinear effects supermode phase that balanced in cavity, exhibited narrowest f0 ~120 kHz near-zero regime.
Femtosecond pulses at 250 MHz repetition rate from a mode-locked fiber laser are amplified to high power in pre-chirp managed amplifier. The experimental strategy offers potential towards high-power ultrashort rates. By investigating the pulse evolution amplification processes, we show that self-similar evolution, finite gain bandwidth and mode instabilities determine characteristics different regimes. Further average scaling is limited by instabilities. Nevertheless, this system enables us...
Diamonds containing the negatively charged nitrogen-vacancy centre are a promising system for room-temperature magnetometry. The combination of nano- and micro-diamond particles with optical fibres provides an option deploying magnetometers in harsh challenging environments. Here we numerically explore coupling efficiency from centres within diamond doped at core/clad interface across range commercially available fibre types so as to inform design process magnetometers. We determine...
Abstract A composite transparent YAG/Yb:YAG/YAG ceramic was prepared by a non-aqueous tape-casting method. An optical transmittance of 82% obtained at visible wavelength and around 1100 nm. low-threshold, broadband tunable continuous-wave (CW) laser 1031 nm further demonstrated from the sample, which pumped 974 fiber-pigtailed diode. The threshold pump power 0.45 W maximum output 3.2 W, corresponding to slope efficiency 20.4%. By inserting an SF57 prism in cavity, could be tuned continuously...
We report on controllable pulse shaping in a Yb-doped stretched-pulse fiber laser followed by high-power chirped amplifier. demonstrate that the pulses after an extra-cavity grating pair change their intensity profile from Lorentz to Gaussian and then sech2 shapes adjusting intra-cavity polarization through quarter-wave plate inside cavity. The with different exhibit pulse-to-pulse amplitude fluctuation of ∼ 1.02%, while sech2-shaped train is provided more stable free-running repetition rate...
We realized a ytterbium-doped fiber self-similar amplification system emitting 50 fs pulses at an average power of W, and made experimental comparisons chirped-pulse the same repetition rate.
We demonstrate a new-type of magnetically sensitive optical fibre fabricated by embedding diamond lead-silicate glass. Nitrogen-vacancy centres, within the particles, exhibit excellent fluorescence intensities and local magnetic field response at room temperature. DC sensitivity hybrid diamond-optical magnetometer achieves 350. n T H z
We demonstrated a period-doubling modelocked (PD-ML) state with the pulse train locked to twice of cavity roundtrip time in Yb-fiber laser. The overall comb tooth such PD-ML laser is characterized through self-referenced f-to-2f beat note. In contrast normally fundamental mode-locking or harmonic mode-locking, carrier-envelope offset frequency ( f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> ) was observed shrink into half...
We demonstrated an active feed-forward method for compensating the relative phase drifts of fiber optical amplifiers. The frequency noise were well controlled in a variation range from???15?Hz free-running, to approximately???1.5?Hz between amplifier input and output. Coherent combination two femtosecond chirped-pulse amplifiers seeded by Ti:S comb oscillator was achieved, which would benefit achieve high accuracy power.
We demonstrate a high-power frequency comb consisting of Ti:sapphire bulk seed laser and large-mode-area Yb-fiber power amplifier. An all-fiber pulse stretcher was carefully designed to suppress the amplitude-to-phase noise in fiber Near-Fourier-limited pulses were obtained with an average up 30?W duration 178?fs. The free-running carrier?envelope-phase optimized have linewidth 52?kHz, which further phase-locked narrow 1.8?mHz integrated phase 0.78?rad.
We demonstrated enhancement of fluorescence emission from helium atoms in terms ultraviolet and infrared filaments nonlinear interaction a mixture argon atomic gases. The seed electrons produced by pulses were accelerated to kick significant amount into high-lying excited states. This provided method efficiently excite through electron collisions for further investigation on electron-ion their effects coherence behavior.
We report on a narrowband mode-locked all-polarization-maintaining fiber laser configuration, where nonlinear optical loop mirror functioned not only as an ultrafast saturable absorber but also interference filter for mode selection.
At present, most atomic spin precession detection schemes use discrete optical elements, which leads to bulky systems. However, chip-based lack modulation, resulting in lower sensitivity. In this paper, we propose and simulatively demonstrate an integrated scheme using on-chip Mach-Zehnder-like interferometer. An polarization sorter is designed, with contrast ratio of 24dB coupling efficiency 16.8% at 795 nm. With device, linearly polarized probe light that experienced rotation can be split...