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Generation of 200 fs optical vortex pulses with 12MW peak power from a Yb-doped fiber amplifier

Optics Letters 2025年第8期50卷 2695-2698页

作者： Luo, Weijia Lin, Di Wang, Shan Yu, Lin Wei, Cunjiang Zhuang, Ziheng Guo, Xiaoyang Liu, Xing Fu, Songnian Qin, Yuwen Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou510006 China Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of China Guangdong University of Technology Guangzhou510006 China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology Guangzhou510006 China Shenzhen Key Laboratory of Ultra-Intense Laser and Advanced Material Technology Center for Intense Laser Application Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Sino-German College of Intelligent Manufacturing College of Engineering Physics Shenzhen Technology University Shenzhen518118 China

We report the generation of high peak power linearly polarized femtosecond optical vortex pulses based on parabolic pulse amplification within a large-mode-area few-mode Ybdoped fiber (YDF) amplifier system. A dispersion-managed passively mode-locked Yb-doped fiber oscillator with a Gaussian-shaped spectrum serves as the seed source, which evolves into parabolic shape in the subsequent preamplifiers. Aq-plate-based mode converter, positioned before the power amplifier, is employed to convert the Gaussian-shaped beam into optical vortex beams with a topological charge of l=±1. The resulting optical vortex beams are efficiently amplified to an average output power of ∼16.8W at a repetition rate of 3.7 MHz, corresponding to a pulse energy of 4.5 μJ. The chirped output pulses are externally compressed to ∼200 fs, achieving a peak power of ∼12.7MW. To the best of our knowledge, this represents the highest peak power achieved to date for optical vortex pulses generated from a conventional step-index fiber. © 2025 Optica Publishing Group.

关键词： Pulse repetition rate

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50-femtosecond all polarization-maintaining fiber laser system at 1100 nm

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Optics Express 2025年第4期33卷 6850-6861页

作者： Wen, Junpeng Lin, Wei Wang, Wenlong Dong, Jiangli Xiu, Hao Fan, Yiheng Cui, Qingyue Yang, Fei Guo, Xiaoyang Liu, Yalong Wei, Xiaoming Yang, Zhongmin School of Physics and Optoelectronics South China University of Technology Guangzhou510640 China School of Materials Science and Engineering Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices South China University of Technology Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques Guangzhou510641 China Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou510006 China Shenzhen Key Laboratory of Ultra-intense Laser and Advanced Material Technology Center for Intense Laser Application Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China Guangzhou Yangming Laser Technology Co. Ltd Guangzhou510663 China Research Institute of Future Technology South China Normal University Guangdong Guangzhou510006 China

We demonstrate a robust high-energy all polarization-maintaining (PM) ultrashort pulse Yb-doped fiber laser system at 1100 nm that explores chirped fiber Bragg gratings (CFBGs) for pre-chirp management. This all-PM fiber laser system delivers compressed pulses at a fundamental repetition rate of 81.56 MHz with a duration of 47 fs and pulse energy of ∼40 nJ. Experimental results reveal that the temperature variation of the CFBGs has a limited influence on the temporal characteristics of compressed pulses. The use of CFBGs in an all-PM-fiber configuration simplifies the implementation of pre-chirp managed amplification, making the laser system robust and compact for practical applications. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Fiber lasers

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Effect of orbital symmetry on atomic ionization in near-infrared laser fields

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Chinese Physics B 2025年第1期34卷 289-292页

作者： Manqi Xu Shilin Hu Li Guo Jing Chen Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of Intelligent Manufacturing Technology of MOE Shantou UniversityShantou 515063China Department of Physics Shanghai Normal UniversityShanghai 200234China Hefei National Research Center for Physical Sciences at the Microscale and School of Physical Sciences Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

We have performed a comparative study of the photoelectron spectra adopting different initial states(2s or 2_(p0))of hydrogen atoms in a near-infrared laser pulse by using the full three-dimensional time-dependent Schr?dinger *** is demonstrated that the atomic photoelectron spectra oscillate out of step as a function of electron kinetic energies for different initial states(2s or 2_(p0)),which is well reproduced by the simulations based on strong field approximation,and the above distinct feature is ascribed to the different interferences from the partial electron wave packets detached by positive and negative electric fields for different initial states of 2s and 2_(p0).

关键词： orbital symmetry photoelectron spectra strong-field approximation

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Propagation dynamics of polynomial noncanonical vortices and applications in optical tweezers

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Optics and lasers in Engineering 2025年 191卷

作者： Yu, Jian Tong, Shandong Long, Huihong Zhang, Zhe Zhou, Min Li, Siying Yang, Yuchuan Chongqing Key Laboratory of Photoelectronic Information Sensing and Transmitting Technology School of Optoelectronic Engineering Chongqing University of Posts and Telecommunications Chongqing400065 China Shenzhen Key Laboratory of Ultra-Intense Laser and Advanced Material Technology and Center for Intense Laser Application Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China Sino-German College of Intelligent Manufacturing Shenzhen Technology University Shenzhen518118 China

Recently noncanonical optical vortices fueling the application of optical communication and optical tweezers alike due to their novel and unique physical properties. Here we propose a new type of polynomial noncanonical optical vortices. Phase distributions, vortex topological charges, and interference patterns of the novel vortices embedded in Gaussian beam show more interesting characteristics. Under different polynomial coefficient combinations, the propagation characteristics of such beams are investigated based on numerical simulation and experimental measurement. Results show that the shape, size and orientation of the beam intensity distribution can be coarse-tuned and fine-tuned by controlling the polynomial coefficients. In addition, the superior self-healing and multi-orthogonal orbital angular momentum (OAM) spiral spectra can provide reference for the application of optical communication. Its diverse optical field structure also provides an opportunity for its application in optical tweezers such as the stable trapping and guiding polystyrene beads which have been verified by experiments. © 2025

关键词： Optical tweezers

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Orientation-resolved Cooper-like minimum in high-order harmonic spectrum from asymmetric molecules

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Optics Express 2025年第9期33卷 19004-19012页

作者： Xu, Qing-Yun Liu, Xi-Wang Song, Xiao-Hong Chen, Jin Yang, Wei-Feng School of Physics and Optoelectronic Engineering Hainan University Haikou570288 China School of Information and Communication Engineering Hainan University Haikou570288 China Hefei National Laboratory University of Science and Technology of China Hefei National Research Center for Physical Sciences at the Microscale School of Physical Sciences Hefei230026 China Shenzhen Key Laboratory of University Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China Center for Theoretical Physics Hainan University Haikou570288 China

We present the observation of an orientation-resolved Cooper-like minimum in the high-order harmonic spectrum from an asymmetric CO molecule employing the time-dependent density functional theory. By applying a linearly polarized field, we find that obvious minimum contributed by HOMO can be observed in the pure even harmonics with the polarization perpendicular to the laser polarization when the molecular axis is perpendicular to the laser polarization. By contrast, when the molecular axis is along to the laser polarization, a minimum can be identified from odd harmonics, but its position is slightly moved with the pulse intensities and wavelengths partly due to the interference between HOMO and HOMO-2. These findings reinforce the current understanding of cooper-like minimum in HHG from asymmetric molecules, providing a way to observe such minimum in asymmetric molecules for experiments by using the laser field with laser polarization perpendicular to the molecular axis and observing the HHG component with the polarization perpendicular to the laser polarization. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Density functional theory

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Angular modulation of nonlinear Breit-Wheeler yield by vacuum dichroism

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Physical Review D 2025年第3期111卷 036025-036025页

作者： Jia-Ding Chen Ya-Nan Dai Kai-Hong Zhuang Jing-Jing Jiang Baifei Shen Yue-Yue Chen Department of Physics Shanghai Normal University Shanghai 200234 China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Intense Laser Application Technology and College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China

Vacuum polarization is numerically investigated for the interaction between a GeV electron beam and a counterpropagating ultraintense laser pulse in the quantum radiation-dominated regime. We identify a signal of vacuum polarization in pair density using a straightforward one-stage setup, circumventing the challenge of preparations of highly polarized probe photons or precise measurements of photon polarization. In our scheme, most electrons are scattered in the direction of laser propagation while emitting substantial linearly polarized gamma photons. These photons undergo vacuum birefringence and dichroism before decaying into electron-positron pairs via the nonlinear Breit-Wheeler process. We demonstrate that vacuum dichroism enhances the purity of linear polarization, which suppresses the overall yield of electron-positron pairs and allows energetic photons to penetrate deeper into the laser pulse. The pairs produced by these energetic photons are more likely to be deflected into small-angle regions rather than being reflected, leading to an enhancement of pair yield in forward scattering. The difference in positron yield may have potential applications in measuring vacuum polarization effect in future laser-particle experiments.

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Generation of Fourier-limited ultrashort soft X-ray isolated attosecond pulses by two-color chirped lasers without chirp compensation

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Journal of the Optical Society of America B: Optical Physics 2025年第5期42卷 1105-1113页

作者： Du, Jin-Xu Wang, Guo-Li Yang, Zeng-Qiang Jiao, Zhi-Hong Zhao, Song-Feng Zhou, Xiao-Xin College of Physics and Electronic Engineering Northwest Normal University Lanzhou730070 China School of Physics and Information Science Shaanxi University of Science and Technology Xi’an710021 China Shenzhen Key Laboratory of Ultra-Intense Laser and Advanced Material Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China

The inherent attosecond chirp (atto-chirp) in high-order harmonic generation (HHG) is one of the primary restrictions on shortening the duration of attosecond pulses. Although dispersive materials can be used to compensate for the atto-chirp in the extreme ultraviolet region to produce a short isolated attosecond pulse (IAP), it is not feasible for higher-energy X-ray broadband harmonics due to the lack of natural materials with negative group velocity dispersion and low loss in this range. To resolve this issue, we have recently proposed an effective way for generating the chirp-free short IAP in the water window without the need for dispersive materials, although it requires the use of a four-color shaping laser field [Opt. Lett. 49, 1571 (2024)]. In this work, we further theoretically demonstrate that HHG driven by a two-color chirped laser field can generate Fourier-limited X-ray IAPs with durations as short as ∼30 as and bandwidths exceeding 150 eV with different central photon energies (240–600 eV) without atto-chirp compensation with natural materials, both on single atom and macroscopic levels. It has been discovered that chirp-free IAPs created by such a laser field result from the interference of platform harmonic radiations produced from several ionization events. This work provides a potential scheme for generating ultrashort soft X-ray IAPs without compensating harmonic chirps with dispersive materials to meet the high demand for these radiation sources. © 2025 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Chirp modulation

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Defects Mitigation and Charge Transport Promotion via a Multifunctional Lewis Base for Efficient 2D/3D Tin Perovskite Solar Cells

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advanced Energy materials 2025年

作者： Chen, Yali Wang, Kun Chen, Wei Li, Tianxiang Tu, Hao Yang, Feng Kang, Ziyong Tong, Yu Wang, Hongqiang Xi'an710072 China School of Microelectronics Northwestern Polytechnical University Xi'an710072 China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Intense Laser Application Technology and College of Engineering Physics Shenzhen Technology University Shenzhen518118 China

Tin perovskite solar cells (PSCs) have garnered considerable attention as promising alternatives to lead PSCs due to their lower toxicity and outstanding optoelectronic properties. However, their efficiency and stability, particularly in 2D/3D tin PSCs, are usually hindered by high defect densities and inefficient carrier transport. In this study, a small-molecule Lewis base with multiple functional groups-cyanoacetohydrazide (CAH) is employed to mitigate defects and enhance charge transport in 2D/3D tin PSCs. It is revealed that the carbonyl, amine, and cyano groups in CAH form strong chemical bonds with Sn2+ ions, resulting in synergetic coordination effects. Moreover, the strong interaction between CAH and tin perovskite effectively regulates the crystallization process of perovskite film, resulting in a high-quality tin perovskite film with enhanced crystallinity, reduced defect density, and a modulated 2D/3D phase distribution. As a result, the optimized 2D/3D tin PSCs achieve a remarkable power conversion efficiency of 15.06%, marking one of the highest values for 2D/3D tin PSCs. Furthermore, the optimized devices exhibit outstanding stability, retaining 95% of their initial performance after 2000 h of storage in a nitrogen atmosphere. © 2025 Wiley-VCH GmbH.

关键词： Perovskite

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Constraining axionlike particles from observations of AGN B2 2234+28A and 3C 454.3

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Physical Review D 2025年第8期111卷 083002-083002页

作者： Yu-Chong Chen Siyu Chen Wei-Cong Huang Qing Yang Hong-Hao Zhang Christ’s College University of Cambridge Cambridge United Kingdom School of Physics Sun Yat-Sen University Guangzhou 510275 China Shenzhen Middle School Shenzhen 518001 China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Intense Laser Application Technology and College of Engineering Physics Shenzhen Technology University Shenzhen 518118 China

Axion-photon oscillation effect provides a possible explanation for the presence of very-high-energy γ-ray signals from distant sources. In this work, we propose a model-dependent method to select possible sources that may give sufficient constraints on the axion parameters. We investigate such effect in the spectra of active galactic nuclei B2 2234+28A and 3C 454.3 based on data obtained from the Fermi Large Area Telescope (Fermi-LAT) and Major Atmospheric Gamma-Ray Imaging Cherenkov telescope. We utilize the Markov chain Monte Carlo method to fit the axion parameters, yielding a result of gaγ=4.27−3.08+1.86×10−11 GeV−1 for the axion-photon coupling strength and ma=3.08−2.16+2.67×10−8 eV for the axion mass. We also perform 95% confidence level constraints to set an upper limit for gaγ.

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Efficiently laser Driven Terahertz Surface Plasmon Polaritons on Long Metal Wire

arXiv

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arXiv 2025年

作者： Shao, Shuo-Ting Wang, Xiang-Bing Huang, Rong Hu, Guang-Yue Chen, Min Tang, Hui-Bo Kuang, Long-Yu Liu, Yu-Xi Gu, Yu-Qiu Ding, Yong-Kun Li, Ru-Xin Zhuo, Hong-Bin Yu, Ming-Yang School of Nuclear Science and Technology CAS Key Laboratory of Geospace Environment University of Science and Technology of China Hefei China School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of High Field Laser Physics CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai China School of Physics Harbin Institute of Technology Harbin150001 China Research Center of Laser Fusion China Academy of Engineering Physics Sichuan Mianyang621900 China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technology College of Engineering Physics Shenzhen Technology University Shenzhen518118 China

We experimentally demonstrate a novel scheme for efficiently generating intense terahertz (THz) surface plasmon polaritons (SPPs) on a sub-wavelength-diameter meter-long metal wire. Driven by a subrelativistic femtosecond laser (a0 = 0.3, 3 mJ) focused at the wire’s midpoint, single-cycle ten-megawatt THz SPPs are excited and propagating bidirectionally along it over 25 cm. The measured laser-to-SPPs energy conversion efficiency is reaching up to ∼ 2.4%, which is the highest value at present. It is proved that the THz SPPs are excited by coherent transition radiation of the subrelativistic laser produced escaping electrons. Particle-in-cell together with CST simulations confirm the experimental observations. Our scheme of using readily available subrelativistic laser should thus be useful to applications requiring terawatt level single-cycle THz SPPs. © 2025, CC BY.

关键词： Femtosecond lasers

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