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

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

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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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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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Janus MXene film with gradient structure for highly efficient terahertz and infrared electromagnetic absorption

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Nano Research 2025年第1期18卷 434-442页

作者： Shaodian Yang Weiqiang Huang Zhiqiang Lin Zibo Chen Rongliang Yang Yi Jia Xuebin Liu Rui Wang Zhiping Zeng Yougen Hu Huanjun Chen Xuchun Gui11 State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China National Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China China Academy of Aerospace Science and Innovation Beijing 100176China Guangdong Province Key Laboratory of Display Material and Technology Guangzhou 510275China School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China

Electromagnetic interference (EMI) shielding inhigh-frequency range, especially the rapidly growing terahertz(THz) frequency range, attracts increasing attention due tothe potential application of terahertz in 6G wirelesscommunication, and security inspection. However, traditionalconductive EMI films typically achieve high shieldingeffectiveness through strong reflection, which may causesecondary pollution to other devices. Here, a gradientstructure strategy was proposed to constructTi_(3)C_(2)Tx/hydroxypropyl methyl cellulose (HPMC) film, in whichthe content of Ti_(3)C_(2)Tx gradually increases along the thicknessdirection, resulting in different conductivity of the two surfaces(surface-M and surface-H) for the film. The obtained gradientfilmexhibits an EMI shielding efficiency of over 48.5 dB in theTHz range (0.2-1.6 THz) at a thickness of 40 μm. Especially,as the THz waves incident from the surface-H to the film, the absorption effectiveness reaches 48.2 dB (average absorbedpower loss up to 91.4%), and the reflection effectiveness is only 0.3 dB. In additions, the gradient-film also demonstrates ahigh absorption rate of 95.5% in the infrared band (2.5-16.7 μm). Moreover, the gradient-film exhibits an excellent tensilestress and Young’s modulus value of 173.1 MPa and 2.8 GPa, respectively. Therefore, the gradient-film proposed in thiswork, with excellent electromagnetic absorption in both THz and infrared band, provides a promising candidate for the nextgenerationEMI shielding applications.

关键词： electromagnetic interference shielding Janus film terahertz MXene

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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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Polarization maintaining all-fiber 2-μm pulse seeded by the soliton self-frequency shift of 1.5-μm pulse

Polarization maintaining all-fiber 2-μm pulse seeded by the...

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2024 advanced Fiber laser Conference, AFL 2024

作者： Yu, Qichun Luo, Xing Wang, Jiachen Lu, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

This study used erbium-doped fiber laser to pump highly nonlinear fibers to generate soliton self-frequency shift (SSFS), and implemented a full fiber polarization maintaining 2 μm master oscillator power amplifier (MOPA) system based on a 1.5 μm pulse laser frequency shift. By using saturable absorber (SA) mode-locked pulses as seed sources, a traditional soliton with a center wavelength of 1560-nm, and a repetition rate of 67-MHz was obtained. After two-stage amplification, the seed pulse can output a maximum average power of 982mW. After two stages of amplification, it can output a maximum average power of 982mW. Cascade a segment of polarization maintaining high nonlinear fiber (PM-HNLF) after the amplification stage, the amplified optical pulse generates soliton self-frequency shift in the PM-HNLF. In this work, a small core PM1550 fiber is used as the high nonlinear fiber, which can ultimately be frequency shifted to 2060nm, with a signal-to-noise ratio of (SNR) 73.32dB. The system is entirely constructed with polarization maintaining fibers, without any free space optical components, with strong anti-interference ability, good stability, and high integration. © 2025 SPIE.

关键词： Saturable absorbers

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All-polarization-maintaining multi-pulse thulium-doped fiber laser based on nonlinear polarization rotation

All-polarization-maintaining multi-pulse thulium-doped fiber...

引用

2024 advanced Fiber laser Conference, AFL 2024

作者： Wang, Tao Li, Zhuobiao Wang, Jiachen Xing, Luo Dong, Fanlong Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

Soliton molecule multi-pulse output was achieved based on an all-polarization-maintaining thulium-doped fiber, with a central wavelength of 1970.6 nm, a pulse repetition frequency of 12.39 MHz, and an average output power of 8 mW. Due to the low pulse output power obtained, it was impossible to measure the pulse width using a commercial autocorrelator, and the oscilloscope could not resolve pulse intervals below 50 ps, thus the symmetric waveform of the soliton molecule was not observed. As the pump power varied, the laser could switch between soliton cluster pulse and noise-like pulse outputs. The laser structure consisted of an all-polarization-maintaining ring cavity pumped by a 793 nm laser. © 2025 SPIE.

关键词： Mode-locked fiber lasers

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Black phosphorus mode-locked Er:ZBLAN fiber laser at 3.5 µm

Black phosphorus mode-locked Er:ZBLAN fiber laser at 3.5 µm

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2024 advanced Fiber laser Conference, AFL 2024

作者： Li, Zhuobiao Li, keyi Wang, Jiachen Xing, Luo Dong, Fanlong Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

In this paper, we demonstrate a all-fiber 3.5 μm mode-locked fiber laser based on Black phosphorus. The fiber laser delivered pulses with a central wavelength of 3468.4 nm, 3 dB spectral bandwidth of 2.1 nm, pulse repetition rate of 16.85 MHz, average output power of 46 mW, and signal-to-noise ratio of 65 dB. Due to the relative low output power and the low sensitivity of detectors in 3.5 μm regime, the pulse width had not hitherto been acquired using a commercial autocorrelation. The Fourier transform limit pulse width estimated by the hyperbolic secant curve is 8.4 ps. This work opens up new ideas for generating all-fiber mode-locking mid-infrared laser. © 2025 SPIE.

关键词： Mode-locked fiber lasers

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3μm watt level Dy: ZBLAN All-fiber high power lasers

3μm watt level Dy: ZBLAN All-fiber high power lasers

引用

2024 advanced Fiber laser Conference, AFL 2024

作者： Zhang, Chun Li, Dianjia Dong, Fanlong Lue, Qitao Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano opt mechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China Han’s Laser Technology Industry Group Co. Ltd. Shenzhen518057 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

The mid-infrared band fiber lasers are very important for fundamental research and industrial applications. Mid-infrared fiber lasers in the 2 - 3.5 μm spectral region have been widely used in many fields, including gas remote sensing, molecular detection, material processing, and biomedicine. In this letter, by splicing the fluoride fiber and the quartz fiber, the 976 nm pump light was fused to a 6 m, 7 mol.%, Er3+:ZBLAN fiber system. With the fluoride fiber grating as the resonator, a 11.7 W continuous light output at 2.8 µm was achieved, realizing a high-power, all-fiber 2.8 µm laser. The laser center wavelength was 2826.6 nm, the maximum slope efficiency was 21.7%, and the beam quality M2 3+: ZBLAN fiber. Using the high-power 2.8 µm all-fiber laser as the pump source, it was fused to a 2.7 m, 0.2 mol.%, Dy3+:ZBLAN fiber system through a single-mode ZBLAN fiber. Two self-inscribed fiber Bragg gratings (FBGs) with reflectivities of 99.68% and 30.5% respectively were used to construct an all-fiber Fabry-Perot laser cavity. A 3.8 W continuous light output at 3.2 µm was achieved under a pump power of 7.7 W, realizing a high-power, all-fiber 3.2 µm laser. The laser center wavelength was 3198.97 nm, the measured slope efficiency was 53.0%, the maximum optical-to-optical efficiency was 49.4%, and the beam quality M2 © 2025 SPIE.

关键词： Fiber lasers

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Mid-infrared period doubled solitons in a few-mode fluoride fiber oscillator

Mid-infrared period doubled solitons in a few-mode fluoride ...

引用

2024 advanced Fiber laser Conference, AFL 2024

作者： Yang, Ying Ma, Shuanglong Chen, Zifeng Luo, Xing Guo, Chunyu Ruan, Shuangchen Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province State Key Laboratory of Radio Frequency Heterogeneous Integration College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen518060 China Key Laboratory of Advanced Optical Precision Manufacturing Technology of Guangdong Higher Education Institutes Shenzhen Technology University Shenzhen518118 China

ISBN: (数字)9781510688889

ISBN: (纸本)9781510688872

Period doubling bifurcation (PDB) phenomenon, which is prevalent in nonlinear systems, has attracted considerable attention because of its potential application value. As an ideal platform for studying the pulse dynamics of nonlinear systems, the mode-locked fiber laser has been intensively investigated in the near-infrared (NIR) spectral region. However, there is a paucity of relevant reports of pulse dynamics in the mid-infrared (MIR) spectral region. Especially for the MIR large-mode-area (LMA) fluoride fiber oscillator, the existence of multiple transverse modes and a new spatial degree of freedom makes the pulse dynamics phenomenon is more complex, which needs to be further explored. In this paper, a soliton regime with a pulse duration of 404.5 fs, repetition frequency of 45.02 MHz, and average output power of 105.3 mW is obtained in a few-mode fluoride fiber oscillator mode-locked by the nonlinear polarization rotation (NPR) technique. By merely increasing the power of the pump, a period doubled soliton with the pulse intensity varying between two different values can be obtained. This work facilitates a more profound comprehension of the nonlinear dynamics in the mid-infrared multimode fluoride fiber laser, and opens up new opportunities for the chaos, optical frequency combs and all-optical modulation. © 2025 SPIE.

关键词： Infrared devices

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