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Temporal Airy–Talbot effect in linear optical potentials

Chinese Optics Letters 2021年第8期19卷 105-110页

作者： Tianwen Han Hao Chen Wenwan Li Bing Wang Peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and TechnologyWuhan 430074China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China

We investigate the Airy–Talbot effect of an Airy pulse train in time-dependent linear *** parabolic trajectory of self-imaging depends on both the dispersion sign and the linear potential *** imposing linear phase modulations on the pulse train,the Airy–Talbot effects accompanied with positive and negative refractions are *** an input composed of stationary Airy pulses,the self-imaging follows straight lines,and the Airy–Talbot distance can be engineered by varying the linear potential *** effect is also achieved in symmetric linear *** study provides opportunities to control the self-imaging of aperiodic optical fields in time dimension.

关键词： Airy pulse Talbot and self-imaging effect dispersion linear potential

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Effect of spin-orbit coupling in laser-induced ionization of atoms

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Physical Review A 2023年第2期108卷 023113-023113页

作者： Yibo Hu Kunlong Liu Klaus Renziehausen Yidian Tian Qingbin Zhang Min Li Yueming Zhou Peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Institute of Physical Chemistry and Abbe School of Photonics Friedrich Schiller University Jena Lessingstraße 4 07743 Jena Germany Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China Optics Valley Laboratory Hubei 430074 China

Based on the expansion of the time-dependent Dirac equation in the second order on the reciprocal of the speed of light, we derive a simplified second-order time-dependent Pauli equation (second-TDPE) for single-active-electron systems, in which the time-dependent spin-orbit interaction is taken into account. A numerical method is presented for calculating the observables for atoms interacting with the electric fields of laser pulses. It is shown that the energy-level splitting between the p+↑ and p+↓ (as well as the p−↑ and p−↓) orbitals can be reproduced by the spin-orbit coupling (SOC) term of the second-TDPE. By numerically solving the second-TDPE, we demonstrate the SOC effect in single-photon, multiphoton, and tunneling ionization of atomic Kr with valence p orbitals. In particular, a few counterintuitive strong-field ionization phenomena are discussed and analyzed. The present work provides a convenient way to explore the SOC effect in strong-field interactions.

关键词： Multiphoton or tunneling ionization & excitation Spin-orbit coupling Ultrafast phenomena

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Spectrally Pure Heralded Single Photons at Telecommunication O-Band from a Custom-Poled KTiPO4 Crystal

Spectrally Pure Heralded Single Photons at Telecommunication...

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Optica Quantum 2.0 Conference and Exhibition, Quantum 2.0

作者： Cai, Wu-Hao Jin, Rui-Bo Edamatsu, Keiichi Kaneda, Fumihiro Research Institute of Electrical Communication Tohoku University 2-1-1 Katahira Sendai980-8577 Japan Graduate School of Engineering Tohoku University 6-6 Aramaki Aza Aoba Aoba-ku Sendai980-8579 Japan Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China PRESTO Japan Science and Technology Agency Kawaguchi332-0012 Japan

We design a custom periodically poled KTiOPO4 crystal to generate a high spectral purity (99.99%) heralded single photons at the telecom O-band. Our designed source is feasible with currently available pump lasers and... 详细信息

ISBN: (纸本)9781957171272

关键词： Laser pumping Nonlinear optical crystals Photonic entanglement Quantum information Quantum light sources Superconducting nanowire single photon detectors

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Resolving and weighing the quantum orbits in strong-field tunneling ionization

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Advanced Photonics 2021年第3期3卷 67-72页

作者： Jia Tan Shengliang Xu Xu Han Yueming Zhou Min Li Wei Cao Qingbin Zhang Peixiang Lu Huazhong University of Science and Technology School of Physics and Wuhan National Laboratory for OptoelectronicsWuhanChina Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern RecognitionWuhanChina

Tunneling ionization of atoms and molecules induced by intense laser pulses contains the contributions of numerous quantum *** the contributions of these orbits is crucial for exploring the application of tunneling and for understanding various tunneling-triggered strong-field *** perform a combined experimental and theoretical study to identify the relative contributions of the quantum orbits corresponding to the electrons tunneling ionized during the adjacent rising and falling quarter cycles of the electric field of the laser *** our scheme,a perturbative second-harmonic field is added to the fundamental driving *** analyzing the relative phase dependence of the signal in the photoelectron momentum distribution,the relative contributions of these two orbits are unambiguously *** results show that their relative contributions sensitively depend on the longitudinal momentum and modulate with the transverse momentum of the photoelectron,which is attributed to the interference of the electron wave packets of the long *** relative contributions of these orbits resolved here are important for the application of strong-field tunneling ionization as a photoelectron spectroscopy for attosecond time-resolved measurements.

关键词： tunneling ionization quantum orbits photoelectron holography attosecond electron dynamics

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Nonreciprocal conversion based on line trajectory near exceptional points

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Results in Physics 2024年 65卷

作者： Liu, Qingjie Liu, Wenrui Li, Tong Ao, Yingquan Ke, Shaolin College of Physics and Electronic Science Hubei Normal University Huangshi 435002 China School of Physics and Electronic Sciences Changsha University of Science and Technology Changsha 410114 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China

Spatio-temporal permittivity modulation can simultaneously impart wave vector and frequency shifts during an indirect photonic transition process where nonreciprocal responses are accomplished. Here, we combine the nonreciprocity with exceptional points (EPs) by employing line parameter trajectory to a spatio-temporally modulated waveguide. The instantaneous state evolutions on direction-dependent Riemann sheets are thus different in forward and backward directions. Light propagates through the structure is nonreciprocal. Forwardly, an arbitrary incident wave will convert to a combination of the two waveguide modes with same intensity. Backwardly, the waves almost entirely convert to one specific mode. The conversion efficiency is more than 80% and robust to the line design. The operating wavelength is in the telecommunications band, conducive to integration with other chips. Compared to the widely used loop path, the line path has the merit of easy preparation in experiments as only one parameter is changed. The research sheds light on the optical devices such as isolator and amplifier. © 2024

关键词： Exceptional points Nonreciprocity Riemann surface Spatio-temporal modulation Topological structure

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Raman Study of the Spin-Lattice Excitations of the Layered Antiferromagnets Mpse3 (M=Fe, Mn)

SSRN

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SSRN 2023年

作者： Qiu, Jin Huang, Wen-Juan Lee, Young Jin Kim, Seung Chen, Xiang-Bai Yang, In-Sang Department of Physics Ewha Womans University Seodaemun-Gu Seoul03760 Korea Republic of Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Donghu New & High Technology Development Zone Wuhan430205 China

Magnetism in van der Waals (vdW) materials has recently garnered significant attention due to their potential for advanced applications. In this study, we investigate the magnetic transition in layered MPSe3 (M=Fe, Mn) flakes utilizing temperature-dependent Raman spectroscopy. Our findings reveal unique features in the Raman spectrum that are strongly correlated with the antiferromagnetic ordering in MPSe3. We analyze the spin-dependent phonon modes in MPSe3 by applying the Suzuki - Kamimura formalism. Consequently, our comparative analyses of the spin correlation function and the reduced magnetization provide compelling evidence of the 2D Ising characteristic especially in FePSe3. Our results clearly show the potential of MPSe3 as a prominent platform for exploring fundamental aspects of low-dimensional magnetism. © 2023, The Authors. All rights reserved.

关键词： Raman spectroscopy

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Multi-Distance Lensless Imaging with Broadband Laser Sources

SSRN

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SSRN 2024年

作者： You, Qijun Gao, Yun Zhang, Fucai Liao, Qing Cao, Wei Lu, Peixiang School of Physics Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan430074 China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Optics Valley Laboratory Wuhan430074 China

Lensless imaging is an imaging method that does not require a high-quality lens and provides a solution for situations where optical imaging is unavailable. In general, the stability and high coherence of the light source are crucial conditions for reliable imaging, which will limit its application in ultrafast pulse light sources with broad spectrum. Here, we present an imaging scheme based on a multi-distance phase retrieval algorithm that allows fast image reconstruction using only three frames of diffraction patterns. We also adapted this method to accommodate the broadband ultrashort illumination source and yield high-fidelity reconstructed images for spectral bandwidths exceeding 12.5%. Our approach enables the effective use of low-flux ultra-broadband sources, providing feasibility for achieving attosecond ultrafast imaging. © 2024, The Authors. All rights reserved.

关键词： Light sources

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Laser-assisted two-color two-photon double ionization of helium atoms

Research Square

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Research Square 2021年

作者： Zhu, Zhizhen Liu, Kai Zhang, Xiaofan Li, Ye Wang, Feng Qin, Meiyan Wang, Zhe Liao, Qing Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

Correlated momentum and kinetic energy distributions of two photoelectrons in laser-assisted two-color two-photon double ionization of helium are investigated by numerically solving a one-plus-one dimensional time-dependent Schrödinger equation (TDSE). We find that the weak assisting laser field can act as an energy transferring field, resulting in burst of double ionization. More importantly, the participation of the laser photon into the double ionization reshapes the correlation patterns in the momentum and kinetic energy distributions. The laser photon can be absorbed by any one of the two electrons, providing two channels that induces destructive interference in the correlated momentum and kinetic energy distributions, which is never found in previous work. © 2021, CC BY.

关键词： Photoionization

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Research and Improvement of Alpha-Beta Search Algorithm in Gobang

Research and Improvement of Alpha-Beta Search Algorithm in G...

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作者： Yuan XIE Wenliang GAO Zuxu DAI Yuanyuan LI School of Mathematics and Phisics Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition

*** allusion to the Alpha-Beta search algorithm which is widely used in Gobang intelligent algorithm,this paper presents an improved method,that is,the heuristic search method using static table,which reduces the search *** the differential evolution algorithm is used to optimize the chess shape parameters and the static table *** to the simulation data,both methods improve the efficiency of Alpha-Beta search algorithm.

关键词： Gobang machine game Alpha-Beta search Differential evolution algorithm

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A Novel Slight-Tilt Measure Method Based on Dynamic Vernier Effect Using Dual Fabry-Perot Interferometers on Vertical Cantilever Beam

SSRN

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SSRN 2022年

作者： Zhang, Songyang Wang, Shun Niu, Panting Cao, Jiyin Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China School of Mechanical and Electrical Engineering Wuhan Institute of Technology Wuhan430205 China

In this work, a new method for measuring slight tilt based on the dynamic Vernier effect is proposed and verified. A pair of the Fabry-Perot interferometers (FPIs) are fixed on the surfaces of a cantilever beam horizontally, and a mass block at the tail end of the beam supplies longitudinal strain on the surfaces, resulting in opposite variations in the cavity lengths (CLs) of FPIs. According to the principle of dynamic Vernier effect at the superposition of reflected light, the shift of the Vernier envelope would be proportional to the tilt angle of the entire structure. The experimental results revealed a strain sensitivity of as high as 6.733 nm/μΕ with a magnification factor of 41. Furthermore, the theoretical simulated results show that the maximum sensitivity would achieve from 204.408 nm/° to 613.25 nm/° within the tilt range from 0 to 15°. In addition, the merits of the proposed tilt sensor such as simple in structure, low cost, and temperature insensitivity in normal environments, all of which promise great application prospects in monitoring suddenly major structural deformation such as mountains and buildings © 2022, The Authors. All rights reserved.

关键词： Fabry-Perot interferometers

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