A5000841507- Advanced Fiber Laser Technologies
- Advanced Fiber Optic Sensors
- Photonic and Optical Devices
- Photonic Crystal and Fiber Optics
- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Laser-Matter Interactions and Applications
- Orbital Angular Momentum in Optics
- Advanced Photonic Communication Systems
- Mechanical and Optical Resonators
- Advanced Optical Sensing Technologies
- Quantum optics and atomic interactions
- Near-Field Optical Microscopy
- Plasmonic and Surface Plasmon Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Nonlinear Photonic Systems
- Shoulder and Clavicle Injuries
- Optical Coherence Tomography Applications
- Shoulder Injury and Treatment
- Photoacoustic and Ultrasonic Imaging
- Advanced Sensor and Control Systems
- Quantum Dots Synthesis And Properties
- Quantum Information and Cryptography
- Spectroscopy Techniques in Biomedical and Chemical Research
- Nonlinear Waves and Solitons
Chongqing University
2017-2025
Central China Normal University
2024
Research Institute of Petroleum Exploration and Development
2021-2023
Sapienza University of Rome
2022
National Institute of Optics
2022
Chongqing University of Technology
2017
The First People's Hospital of Xiaoshan District, Hangzhou
2017
Nankai University
2012-2016
We propose a method to generate the high-order optical vortex in few-mode fiber via cascaded acoustically driven vector mode conversion. Theoretical analysis showed that conversion induced by grating (AIFG) could occur between two HE modes with adjacent azimuthal numbers. In experiment conducted at 532 nm, AIFGs were simultaneously same segment of radio frequency source containing different components. One AIFG was used convert left- and right-handed circular polarization fundamental...
We presented a method to actualize the optical vortex generation with wavelength tunability via an acoustically-induced fiber grating (AIFG) driven by radio frequency source. The circular polarization fundamental mode could be converted first-order through AIFG, and its topological charges were verified spiral pattern of coaxial interference between Gaussian-reference beam. A spectral tuning range from 1540 nm 1560 was demonstrated slope 4.65 nm/kHz. conversion efficiency 95% within whole range.
Theoretical analysis and experimental demonstration are presented for the generation of cylindrical vector beams (CVBs) via mode conversion in fiber from HE11 to TM01 TE01 modes, which have radial azimuthal polarizations, respectively. Intermodal coupling is caused by an acoustic flexural wave applied on fiber, whereas polarization control necessary conversion, i.e. HE11x→TM01 HE11y→TE01 vibration along x-axis. The frequency RF driving signal actuating determined phase matching condition...
Mode coupling from the fundamental vector mode (HE11x) to cylindrical beams (CVBs) and optical vortex (OVBs) of a few-mode fiber excited by two acoustic flexural waves with orthogonal perturbations is achieved using composite transducer. The HE11x converted TM01 TE01 modes, which have radial azimuthal polarizations, lowest-order modes F11x F11y, respectively. Furthermore, can also be ± 1-order OVBs HE21even±iHE21odd through combined F11x±iF11y. This technique provides useful way generating...
Ultra-high spectral purity lasers are of considerable research interests in numerous fields such as coherent optical communication, microwave photonics, distributed fiber sensing, gravitational wave detection, clock, and so on. Herein, to deeply purify laser spectrum with compact size under normal condition, we propose a novel practical idea effectively suppress the spontaneous radiation cavity through weak external perturbation. Subsequently, configuration consisting main lasing an feedback...
We proposed a method for generation of femtosecond optical vortex pulse in two-mode fiber based on an acoustically induced grating (AIFG) driven by radio frequency source. Theoretical analysis and experimental results demonstrated that the left- right-handed circular polarization fundamental modes could be converted to linearly polarized ±1-order through AIFG with mode conversion efficiency ∼95%. The off-axial interference experiment angle-dependent intensity examination were performed...
We proposed and demonstrated a linewidth compression method of laser based on stimulated Brillouin scattering (SBS) Rayleigh backscattering structure (RBS). The relationship between the output SBS input pump was studied theoretically experimentally. It is shown that narrower leads to bandwidth gain and, finally, will tend its intrinsic value as than 10 kHz; then an fiber ring would 200 Hz. In order further reduce with low cost, RBS simple dual-cavity feedback were added ∼75 Hz...
We present a detailed analysis on mode evolution of grating-coupled surface plasmonic polaritons (SPPs) conical metal tip based the guided-wave theory. The eigenvalue equations for SPPs modes are discussed, revealing that cylindrical waveguides only support TM<sub>01</sub> and HE<sub>m1</sub> modes. During propagation tip, converted to HE<sub>31</sub>, HE<sub>21</sub>, HE<sub>11</sub> successively, these sequentially cut off except TM<sub>01</sub>. further propagates with drastically...
Abstract Tip-based plasmonic nanofocusing, which delivers light into a nanoscale region and achieves localized electromagnetic (EM) field enhancement beyond the diffraction limit, is highly desired for light-matter interaction-based super-resolution imaging. Here, we present nanofocusing at apex of silver (Ag)-coated fiber tip with internal illumination radial vector mode (RVM) generated directly in an optical based on acoustically-induced grating (AIFG). As illustrated by theoretical...
Microcavity-based Brillouin lasers are promising high-performance light sources for integrating photonics and optoelectronics. One method to lock the pump frequency is utilize a complex system with optoelectronic feedback, which requires high-cost narrow-linewidth laser limits application of microlasers in integrated systems. Another reported recently all-optical feedback achieve locking microcavity laser. We propose Rayleigh scattering microcavities resonant method. While compressing...
Using a two-layer structure consisting of polyethylene terephthalate (PET) and polydimethylsiloxane (PDMS) to support graphene grown by chemical vapor deposition (CVD), we demonstrate flexible integrated saturable absorber (SA) on microfiber for passive mode-locked soliton fiber laser. This method can optimize the light-graphene interaction using evanescent field in integration structure. Moreover, laser with in-line microfiber-to-graphene SA realize tunabilities both 3dB bandwidth output...
We propose an optically controlled tunable ultra-narrow linewidth fiber laser assisted with the mode selection induced by a saturable absorption interference ring and narrowing of Rayleigh backscattering (RBS). The serves as artificial narrow-band filter, which conduces to operating at single-frequency state. To realize narrower linewidths, additional single-mode is utilized accumulate weak RBS feedback. On basis inherent wavelength universality this linewidth-narrowing mechanism,...
The synergy of a plasmonic tip and fiber-based structure light field excitation can provide powerful tool for Raman examination. Here, we present method spectrum enhancement with an Ag-nanoparticles (Ag-NPs)-coated fiber probe internally excited via azimuthal vector beam (AVB), which is directly generated in few-mode by using acoustically induced grating. Theoretical analysis shows that gap mode be effectively on the surface Ag-NPs-coated AVB. experimental result intensity signal obtained...
We report a tunable add/drop channel coupler based on an acousto-optic filter and tapered fiber. The coupling efficiency central wavelength of the are by simply tuning power frequency driving radio signal. Further possible improvements configuration also discussed.
An all-fiber optical heterodyne detection configuration was proposed based on an acousto-optic structure, which acted as both frequency shifter and coupler at the same time. The vibration waveform within a range between 1 Hz to 200 kHz of piezoelectric mirror measured using this system. minimal measurable amplitude resolution are around 6 pm in region tens hundreds kilohertz, respectively. has advantages compact size, high accuracy non-contact measurement. Moreover, it is dynamically...
Au-nanoparticle (Au-NP) substrates for surface-enhanced Raman spectroscopy (SERS) were fabricated by grid-like scanning a Au-film using femtosecond pulse. The Au-NPs directly deposited on the surface due to process. experimentally obtained presented local plasmon resonance effect in visible spectral range, as verified finite difference time domain simulations and measured reflection spectrum. SERS experiment Au-NP exhibited high activity excellent substrate reproducibility stability, clearly...
An all-fiber tunable laser was fabricated based on an acousto-optic filter and a tapered fiber. The structure of high signal-to-noise ratio, therefore, no extra gain flattening needed in the laser. In experiment, wavelength could be tuned from 1532.1 nm to 1570.4 with 3-dB bandwidth about 0.2 nm. Given enough nonlinearity cavity, it also generate sliding-frequency pulse train. gains advantages fast tuning agility generation, its simple is low cost for practical applications.
Dissipative solitons emerge as stable pulse solutions of nonintegrable and nonconservative nonlinear physical systems, owing to a balance nonlinearity, dispersion, loss/gain.A considerable research effort has been dedicated characterizing amplitude phase evolutions in the spatiotemporal dynamics dissipative emerging from fiber lasers.Yet, picture buildup process lasers is incomplete absence corresponding information about polarization evolution.Here, we characterize probabilistic...
A fast tunable dual-wavelength laser based on in-fiber acousto-optic Mach-Zehnder interferometer (AO-MZI) with new fabrication process is proposed. Not only could the center wavelength of output be optimized enhanced tuning range about 30 nm by polarization and driving frequency radio (RF) signal accordingly, but also spectral spacing between two wavelengths tuned from ~0 to 2.65 controlling power RF signal. The mechanism was discussed.
Single longitudinal mode (SLM) distributed feedback (DFB) lasers with a linewidth lower than few kHz find applications in many coherent detection systems. In this paper, we proposed and experimentally demonstrated novel method to compress the of SLM DFB laser by utilizing dual-cavity structure (DCFS). The DCFS first provides optical self-injection linewidth, then two lengths are carefully optimized achieve output via Vernier principle suppression modes overlapping between cavities....