A5004462619- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Laser-Matter Interactions and Applications
- Optical Network Technologies
- Solid State Laser Technologies
- Orbital Angular Momentum in Optics
- Optical Coherence Tomography Applications
- Diamond and Carbon-based Materials Research
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Rough Sets and Fuzzy Logic
- Optical Wireless Communication Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advanced Frequency and Time Standards
- Optical Systems and Laser Technology
- Photonic Crystals and Applications
- Perovskite Materials and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Advanced Computing and Algorithms
- Luminescence Properties of Advanced Materials
- Nanowire Synthesis and Applications
- Magnetic Properties and Applications
- Magnetic properties of thin films
- Semiconductor Lasers and Optical Devices
Nanjing Audit University
2025
Shanghai Institute of Optics and Fine Mechanics
2018-2024
Chinese Academy of Sciences
2018-2024
University of Chinese Academy of Sciences
2024
Beijing Institute of Technology
2020
Shanghai University
2016-2018
Henan Normal University
2010-2018
Recently, constructing van der Waals (vdW) heterojunctions by stacking different two-dimensional (2D) materials has been considered to be effective strategy obtain the desired properties. Here, through first-principles calculations, we find theoretically that 2D $n$-InSe/$p$-GeSe(SnS) vdW are direct-band-gap semiconductor with typical type-II band alignment, facilitating separation of photogenerated electron and hole pairs. Moreover, they possess high optical absorption strength...
We report a simple method for generating optical vortex beams (OVB) from an all-fiber laser. An intracavity mode converter based on few-mode fiber long-period gratings was used to enable the OVB operation. The intensity profiles and wavefront helicity of output laser were characterized by analyzing spatial emission its self-interference. Selection handedness can be achieved simply adjusting polarization controller. ~50 mW power both first-order second-order modes generation with...
Supercontinuum covering the ultraviolet-blue region is highly useful for fluorescence microscopy. Four zero-dispersion wavelength decreasing photonic crystal fibers with different fiber cross structures and taper profiles are fabricated to extend short edge of supercontinuum. Both nanosecond picosecond pump pulses at 1 μm used generate With a 3 ns pulse, supercontinuum extended below 400 nm in high air-hole ratio (named T3). The underlying mechanism generation explored. long edges related...
An all-fiber passively picosecond mode locked Erbium doped laser using a 45° tilted fiber grating (45° TFG) and Bragg (FBG) is reported in this work. Due to the strong polarization dependent loss (PDL) of TFG narrow 3-dB bandwidth FBG, (EDFL) can generate pulse based on nonlinear rotation (NPR) effect. The features repetition rate 9.67 MHz, duration 33 ps, signal-to-noise ratio (SNR) 70 dB, an average output power 1.2 mW, single energy 124 pJ under pump 102 mW. Besides, central wavelength be...
In this paper, we report a passively Q-switched and mode-locked ytterbium fiber laser employing Bi2S3 nanowire as saturable absorber (SA). The Q-switching mode-locking can be achieved in the same cavity at pump power through carefully rotating intra-cavity polarization controller. experiment, maximum output pulse energy is 157.2 nJ with repetition rate of 22.26 kHz 116.7 mW, while for passive mode-locking, train has 3.94 MHz, width 782 ps SNR ~49 dB. wavelength are both centered ~1038 nm, 3...
Hollow core photonic bandgap fiber (HC-PBGF) has potential in the application of optics gyroscopes (FOGs) for its properties low nonlinearity, and excellent environmental adaptability.However, due to structural complexity, HC-PBGF is prone defects during fabrication process, which will cause degradation longitude uniformity optical fiber.The longitudinal non-uniformity structure limits preparation length HC-PBGF, while high-precision FOGs need be made with long-distance high-performance...
A single/dual-wavelength switchable bidirectional Q-switched fiber laser using a polarizer is demonstrated. 45° tilted grating used as to induce intracavity birefringence filter in both clockwise (CW) and counter-clockwise (CCW) directions. carbon nanotube saturable absorber employed produce pulses. Through adjusting polarization states, lasing at 1551 1560 nm can be achieved CW CCW To the best of our knowledge, this first demonstration wavelength passively laser.
We systematically study the impact of average cavity dispersion and pulse spectral bandwidth on harmonic mode locking in long-wavelength band from an Er-doped fiber laser using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film locker. By carrying out energy management through optimizing optical bandwidth, 2.08 GHz repetition rate corresponding to 201 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> with 36.5 dB side suppression ratio...
We demonstrate a passively harmonic mode-locked (PHML) fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film. Under suitable pump power and an appropriate setting of polarization controller (PC), 54th pulses are generated with side mode suppression ratio (SMSR) better than 44 dB repetition frequency 503.37 MHz. Further increasing leads to higher 550 MHz compromised stability 38.5 SMSR. To best our knowledge, this is first demonstration on generation...
We have systematically studied the 45° tilted fiber grating (45TFG) as a functional device for erbium-doped laser (EDFL) mode locking. A number of 45TFGs with different polarization-dependent loss (PDL) been fabricated. Mode-locked using these devices characterized in terms threshold, pulse duration, signal-to-noise ratio, and spectral width. Our results show that 45TFG higher PDL could achieve better results. By 24 dB PDL, mode-locked has 8.1% conversion efficiency threshold 200 mW.
Abstract Graphene's atomic thickness, gapless Dirac–Fermionic band structure, and large thermal conductivity make it a promising element for applications in photonic integrated devices. Importantly, actively tunable graphene‐waveguide‐integrated optoelectronic devices can potentially be utilized the realization of reconfigurable systems. Since electrical device control is always preferred, researchers have previously demonstrated gate‐variable graphene devices; however, remains challenging,...
We demonstrated a passively Q-switched erbium-doped fiber laser (EDFL) using PbS quantum dots in polystyrene films (QDPFs) as saturable absorbers (SAs). Compared to other SAs, QDPFs have advantages of broad absorption range, high yield, low cost, and facile preparation. successfully generated stable pulses with an average output power 40.19 mW, single pulse energy 586.1 nJ, repetition rate 68.04 kHz, width 3.9 μs, signal-to-noise ratio 50.5 dB under 660 mW pump power. The the EDFL has been...
The step-index heavily germanium-doped silica fibers with all normal dispersion (ANDi) are promising candidates for highly coherent supercontinuum (SC). These ANDi easier to fabricate, splice and handle than photonic crystal (PCFs). 40 % GeO2 doped fiber of 3 μm core diameter has flat near-zero which is between -5.5 0 ps/nm/km from 1.4 2.4 μm. Highly SC spanning 1050 nm 2100 generated the pumped at 1560 nm. All-fiber source 1200 2200 achieved by splicing a femtosecond laser 90 couple...
Abstract With the Monte Carlo method, we investigate magnetic properties of four nanomagnets different shapes, i.e., circular‐shaped, square‐shaped, elliptical, and ring‐shaped nanomagnets. A systematic study effects dipolar interaction on configurations is performed in these nanomagnets, further coercive field remanence as a function are analyzed. The results show that configuration thus magnetization reversal process dependent strongly strength interactions. For case small interaction,...
Nanosecond passive Q-switching generation from an all-fiber erbium-doped laser with a UV inscribed 45° tilted fiber grating (TFG) is systematically demonstrated. The TFG employed as polarizer together two polarization controllers (PCs) to realize nonlinear rotation (NPR). Because of the NPR effect, stable Q-switched pulses average output power 17.5 mW, single pulse energy 72.7 nJ, repetition rate 241 kHz, width 466 ns, and signal noise ratio (SNR) 58.8 dB are obtained 600 mW pump power. To...
We propose and demonstrate a passively harmonic mode-locked erbium-doped fiber laser (EDFL) using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film.The allows generation of the pulses with repetition rate 580 MHz, which corresponds to 22nd harmonics 26.3 MHz fundamental under 323 mW pump power.A particularly noteworthy feature is super-mode suppression ratio (SMSR), over 40 dB, indicating stable operation.
We demonstrate an all-fiber laser generating orbital angular momentum (OAM) beams based on a two-mode fiber long-period grating. The experimental results confirm that the can generate OAM successfully.
The Brillouin gain spectrum (BGS) provides key information for stimulated scattering (SBS), such as the frequency shift (BFS), spontaneous linewidth, and coefficient. In this study, we theoretically investigate field distributions BGS characterization of Ge-doped, Al-doped, Al/Ge co-doped fibers. Additionally, analyzed compared relationship between acoustic refractive index. particular, demonstrate crucial role played by modes in anti-waveguide structures. simulation results show that...