- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Cylindrical Vector Beam Fibre Laser Based on photonic lantern
摘要： We demonstrate a linear-cavity continuous-wave (CW) fibre laser generating cylindrical vector beams (CVBs) using a photonic lantern as transverse mode converter and mode splitter. The CVB fibre laser operates at a center wavelength of 1553.1 nm, with a 3 dB linewidth of less than 0.08 nm and a signal-to-background ratio of > 45 dB. The measured purity of the radially and azimuthally polarized beams is > 96%.
关键词： continuous-wave,Cylindrical Vector Beam,photonic lantern
更新于2025-11-28 14:24:03
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Toroidal and reverse flux of light in the sharp focus
摘要： We obtain a set of explicit analytical expressions that completely describe a light field with a double higher-order singularity (phase and polarization), as well as distributions of its intensity and energy flux near the focus.There is a reverse energy flux on the optical axis near the focus, which is comparable in magnitude with the forward flux. There is a toroidal energy flux in the focal area near the dark rings in the distribution of the longitudinal component of the Poynting vector.
关键词： cylindrical vector beam,optical vortex,energy backflow,toroidal vortex,tight focusing
更新于2025-09-19 17:13:59
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All-fiber mode-locked laser emitting broadband-spectrum cylindrical vector mode
摘要： We experimentally demonstrate an all-fiber mode-locked laser emitting broadband-spectrum cylindrical vector mode pulse based on nonlinear polarization rotation and long-period fiber grating. In this laser, A few-mode long-period fiber grating with broad bandwidth of 125 nm at 1.0 μm band is utilized as mode converter inside the cavity. A flat-end connector deposited with gold film is used as output coupler offering a wideband reflection. Thus the generation of broadband spectrum cylindrical vector mode is feasible owing to the combination of broadband mode converter and output coupler. Stable mode-locked train is achieved at a repetition rate of 9.83 MHz and pulse duration of 168 ps. The proposed laser oscillates at 1030 nm with a broad spectral width of 5 nm at 3 dB. All four degenerate vector modes in the first group higher-order mode can also be obtained with mode purity higher than 95%. This work may have the potential for generation of high-purity and ultra-fast cylindrical vector beam.
关键词： Cylindrical vector beam,Fiber laser,Broadband spectrum,Mode-locking
更新于2025-09-16 10:30:52
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High-speed directly-modulated cylindrical vector beam lasers
摘要： Cylindrical vector (CV) beams are highly desirable for wide applications ranging from manipulation to communications. Despite diverse schemes of CV beam emitters, the efficient generation of vector beams by active photonic integrated devices, especially for direct modulation, is still an outstanding challenge. Here, we report the first high-speed directly-modulated CV beam laser under electrical pumping. InP-based microring cavities with two sets of optimized second-order gratings enable single-mode lasing and efficient emission assisted by ion implantation. The high-differential-gain multiple-quantum-well structure and small active region benefit high-speed modulation. The surface emission facilitates easy 2D array integration. CV beam lasing is achieved with >1mW output power and ~50dB side-mode suppression-ratio (SMSR). CV beam lasers at 8-20Gbit/s are realized in the experiment. Moreover, a 2-km fiber vector eigenmode transmission link, seeded by a 10-Gbit/s directly-modulated CV beam laser, is also demonstrated with favorable performance. These may open a door to find more CV beam enabled classical and quantum communication applications employing integrated lasers.
关键词： photonic integrated devices,Cylindrical vector beam,microring resonator,direct modulation,semiconductor laser
更新于2025-09-16 10:30:52
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All few-mode fiber passively mode-locked figure-8 cavity laser
摘要： We propose and demonstrate an all few-mode fiber (FMF) passively mode-locked figure-8 cavity laser, for the first time to the best of our knowledge. In this laser, all the components including the used gain medium of few-mode erbium-doped fiber (FM-EDF) are based on and connected with FMF. A homemade wavelength division multiplexing-mode selective coupler (WDM-MSC) makes it possible for 976 nm pump light source to be simultaneously converted to LP11 mode and multiplexed into the FM-EDF. The obtained cylindrical vector beams (CVBs) pulses exhibit a signal-to-noise ratio 78 dB with fundamental repetition rate of 3.51 MHz. Furthermore, CVBs with the purity of over 94% have been obtained by simply adjusting the polarization controllers. The all-FMF mode-locked fiber laser could not only have the potential applications for MDM telecommunication and high-power fiber laser seed sources, but also is a perfect platform for nonlinear science.
关键词： mode-locking,cylindrical vector beam,few-mode fiber
更新于2025-09-16 10:30:52
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Plasmonic Nanolenses Produced by Cylindrical Vector Beam Printing for Sensing Applications
摘要： Interaction of complex-shaped light fields with specially designed plasmonic nanostructures gives rise to various intriguing optical phenomena like nanofocusing of surface waves, enhanced nonlinear optical response and appearance of specific low-loss modes, which can not be excited with ordinary Gaussian-shaped beams. Related complex-shaped nanostructures are commonly fabricated using rather expensive and time-consuming electron- and ion-beam lithography techniques limiting real-life applicability of such an approach. In this respect, plasmonic nanostructures designed to benefit from their excitation with complex-shaped light fields, as well as high-performing techniques allowing inexpensive and flexible fabrication of such structures, are of great demand for various applications. Here, we demonstrate a simple direct maskless laser-based approach for fabrication of back-reflector-coupled plasmonic nanorings arrays. The approach is based on delicate ablation of an upper metal film of a metal-insulator-metal (MIM) sandwich with donut-shaped laser pulses followed by argon ion-beam polishing. After being excited with a radially polarized beam, the MIM configuration of the nanorings permitted to realize efficient nanofocusing of constructively interfering plasmonic waves excited in the gap area between the nanoring and back-reflector mirror. For optimized MIM geometry excited by radially polarized CVB, substantial enhancement of the electromagnetic near-fields at the center of the ring within a single focal spot with the size of 0.37λ2 can be achieved, which is confirmed by Finite Difference Time Domain calculations, as well as by detection of 100-fold enhanced photoluminescent signal from adsorbed organic dye molecules. Simple large-scale and cost-efficient fabrication procedure offering also a freedom in the choice of materials to design MIM structures, along with remarkable optical and plasmonic characteristics of the produced structures make them promising for realization of various nanophotonic and biosensing platforms that utilize cylindrical vector beam as a pump source.
关键词： plasmonic nanostructures,cylindrical Vector Beam printing,Sensing Applications,nanofocusing,plasmonic nanolenses
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Intra-Cavity Mode-Selective Coupler Assisted Ultrafast Cylindrical Vector Fiber Laser
摘要： Cylindrical vector beam (CVB) fiber lasers have attracted great attentions due to their promising applications in optical communications, super-resolution imaging and optical trapping. Recently, it has been proved that mode-selective coupler (MSC) is an efficient method for generating CVBs in all-fiber lasers [1-3]. However, to date, the reported MSC-assisted CVB lasers have a common feature that the fundamental transverse mode (LP01) oscillates in the laser cavity whereas the high-order modes are outside the laser cavity. To some extent, such cylindrical vector lasers belong to the external mode conversion, rather than the direct generation of high-order modes inside the laser cavity. In this contribution, we present an intra-cavity MSC assisted CVB fiber laser in a compact linear-cavity mode-locked by using a semiconductor saturable absorber mirror (SESAM). The laser architecture is shown in Fig. 1(a), which consists of a 5 m Er-doped fiber, a 980/1550 wavelength-division multiplexer (WDM) pumped by a 980 nm laser, a polarization controller (PC), a 90% high coupling ratio MSC with an insertion loss of 0.3 dB. A fiber end-facet mirror is sandwiched between the two fiber ferrules and a SESAM mode locker has a modulation depth of 18%. The rest of cavity consists of ~14.3 m standard single-mode fiber (SMF) and ~0.6 m few mode fiber (FMF). Self-started mode-locking occurs when the pump power reaches ~35 mW. Thanks to the high coupling efficiency of intra-cavity mode converter, LP01 mode in the SMF is sufficiently coupled to LP11 mode in the FMF when it passes through the MSC. The reflected LP11 mode from the mirror can be partially coupled back to the SMF with a low loss, resulting in the laser oscillation. In this case, the laser operates between MSC and the mirror in the LP11 mode, which outputs from the FMF, meanwhile the LP01 mode oscillates in the remaining section of the linear-cavity. Eventually, the laser can allow the direct generation of LP11 mode from the laser cavity. Typical laser output characteristics such as broadband spectra, pulse train and output power are shown in Fig. 1(b)-(e). The laser operates at the wavelength of 1562 nm with a 3-dB bandwidth of ~4.4 nm and a repetition rate of 5.2 MHz. Radially polarized and azimuthally polarized ultrafast CVBs are obtained by adjusting the PC, and corresponding donut beam profiles are demonstrated by checking the rotating intensity distribution through the linear polarizer, as presented in Fig. 1(f).
关键词： Cylindrical vector beam,mode-selective coupler,ultrafast,fiber laser
更新于2025-09-11 14:15:04
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Subwavelength focusing of a cylindrically symmetric plano-concave lens based on a one-dimensional Thue–Morse photonic quasicrystal
摘要： A cylindrically symmetric plano-concave lens based on a one-dimensional (1D) Thue–Morse photonic quasicrystal (PQC) is proposed. Sub-wavelength focusing characteristics with an incident cylindrical vector beam are investigated. Numerical results reveal that the lens can exhibit polarization-independent, high-resolution, and low-side-lobe characteristics, simultaneously for near-?eld and non-near-?eld. Furthermore, the lens can achieve perfect focusing and size-independent characteristics with equal-proportion scaling of the size of the lens at the corresponding center frequency. The focusing mechanisms of the lens are explained by analyzing the transmission spectrum, dispersion relation of a 1D periodic photonic crystal, and transmission spectrum of the 1D Thue–Morse PQC.
关键词： cylindrical vector beam,Subwavelength focusing,plano-concave lens,photonic quasicrystal
更新于2025-09-04 15:30:14